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WOOD CONSTRUCTION DATA 4
Chapter/Title Page
Introduction .......................................................... 1
General Description ............................................. 1
Principles of Design............................................. 1
Advantages of System ......................................... 1
Limitations of System .......................................... 1
Construction Details ............................................ 2
Structural Requirement ....................................... 2
Design Data for Planks ........................................ 3
Design Data for Beams ........................................ 4
Notations............................................................... 4
Lumber Sizes ........................................................ 4
Figure Page
1 Comparison of Plank-and-beam System
With Conventional Framing ......................... 5
2 Use of Spaced Beam to Accommodate
Electrical Cable ............................................. 6
3 Methods of Finishing Undersides of
Beams ............................................................ 6
4 Methods of Treating Joints in Exposed
Plank Ceilings ............................................... 6
5 Support for Non-bearing Partition
Parallel to Plank With Beam Under Floor .. 7
6 Support for Non-bearing Partition
Parallel to Plank With Beam Above Floor . 7
7 Plank-and-beam Framing for One-story
House ............................................................. 8
8 Plank-and-beam Framing Combined
With Conventional Framing in Two-story
House ............................................................. 9
9 First Floor Framing at Exterior Wall
With Beam Bearing on Sill ......................... 10
10 First Floor Framing at Exterior Wall With
Beam Set in Foundation Wall .................... 10
Figure Page
11 Solid Beam Bearing Over Basement
Post .............................................................. 10
12 Spaced Beam Bearing Over Basement
Post ...............................................................11
13 Beam Bearing at Second Floor Exterior
Wall ...............................................................11
14 Spaced Beam Bearing at Second Floor
Exterior Wall .................................................11
15 Solid Beam at Second Floor Over
Interior Post ................................................ 12
16 Spaced Beam Bearing at Second Floor
Over Interior Post ....................................... 12
17 Roof Beam and Spaced Floor Beam
Bearing at Exterior Wall ............................. 12
18 Arrangement of Roof and Floor Beams to Absorb Horizontal Thrust ...................... 13
19 Bearing of Solid Roof Beam on Exterior
Wall Post...................................................... 14
20 Methods of Supporting Roof Beam on
Ridge Beam to Absorb Horizontal
Thrust .......................................................... 15
i
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ii PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table Page Table
1 Nominal Two-Inch Plank. .......................... 17
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) to support safely a live load of 20, 30, or 40 pounds per square foot within a deflection limitation of
L/180, L/240 or L/360.
2 Floor and Roof Beams ............................... 18
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
20 pounds per square foot within a deflection limitation of L/180.
3 Floor and Roof Beams ............................... 20
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
20 pounds per square foot within a deflection limitation of L/240.
4 Floor and Roof Beams ............................... 22
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
20 pounds per square foot within a deflection limitation of L/360.
5 Floor and Roof Beams ............................... 24
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
30 pounds per square foot within a deflection limitation of L/180.
Page
6 Floor and Roof Beams ............................... 26
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
30 pounds per square foot within a deflection limitation of L/240.
7 Floor and Roof Beams ............................... 28
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
30 pounds per square foot within a deflection limitation of L/360.
8 Floor and Roof Beams ............................... 30
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
40 pounds per square foot within a deflection limitation of L/180.
9 Floor and Roof Beams ............................... 32
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
40 pounds per square foot within a deflection limitation of L/240.
10 Floor and Roof Beams ............................... 34
Required values for fiber stress in bending
(f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of
40 pounds per square foot within a deflection limitation of L/360.
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WOOD CONSTRUCTION DATA 4
The plank-and-beam method for framing floors and roofs has been used in heavy timber buildings for many years. The adaptation of this system to residential construction has raised many technical questions from designers and builders concerning the details of application. This publication presents technical data that will be helpful to students, architects, engineers and builders. It contains information pertaining to principles of design, advantages and limitations, construction details, and structural requirements for the plank-and-beam method of framing.
Whereas conventional framing utilizes joists, rafters and studs spaced 12 to 24 inches on center, the plank-andbeam method requires fewer and larger sized pieces spaced farther apart. A simple comparison of the two methods is shown in Figure 1.
In plank-and-beam framing, plank subfloors or roofs, usually of 2-inch nominal thickness, are supported on beams spaced up to 8 feet apart. The ends of the beams are supported on posts or piers. Wall spaces between posts are provided with supplementary framing to the extent required for attachment of exterior and interior finish. This supplementary framing and its covering also serve to provide lateral bracing for the building.
The most successful plank-and-beam houses are those which are designed from the beginning for this method of framing. Such procedure permits the correlation of the structural framework with the exterior dimensions of the house, the location of doors and windows and the location of interior partitions. Proper study of these features in the early stages will contribute much to simplified framing.
The most efficient use of 2-inch plank occurs when it is continuous over more than one span. Where standard lengths of lumber are used, such as 12, 14 or 16 feet, beam spacings of 6,7 or 8 feet are indicated and this has bearing on the overall dimensions of the house. Where end joints in the plank are allowed to occur between supports, tongued-and-grooved or splined random length planks may be used and the beam spacing adjusted to fit the dimensions of the structure. Where square edged planks are used for sub-flooring, recommendations of the National Oak
Flooring Manufacturing Association should be followed.
Windows and doors should be located between posts in exterior walls to eliminate the need for headers over the openings. The wide spacing between posts permits ample opportunity for large glass areas. However, a sufficient amount of solid wall should be present to provide adequate lateral bracing.
Combination of conventional framing with plank-andbeam framing is sometimes used. Where the two adjoin each other on a side-by-side basis, no particular problems are encountered. Where a plank-and-beam floor or roof is supported on a stud wall, a post should be placed under the end of the beam to carry the concentrated load. Where conventional roof framing is used with plank-and-beam construction, a header should be installed to carry the load from the rafters to the posts.
There are many advantages to be gained through the use of the plank-and-beam system of framing. In many houses the roof planks serve as the ceiling, thereby providing added height to living areas with no increase in cost.
Where planks are selected for appearance, no further ceiling treatment is needed except the application of a stain, sealer or paint, which may result in substantial cost savings.
Plank-and-beam framing permits substantial savings in labor. The pieces are larger and there are fewer of them than in conventional framing. Cross-bridging of joists is eliminated entirely. Larger and fewer nails are required.
All of this adds up to labor savings at the job site.
There are limitations on the use of the plank-and-beam system, but they are readily resolved through careful study in the planning stage. When this is done the parts of the house fit together very quickly and easily.
The plank floors are designed for moderate uniform loads and are not intended to carry heavy concentrated loads. Where such loads occur as those for bearing partitions, bathtubs, refrigerators, etc., additional framing is needed beneath the planks to transmit the loads to the beams.
Insulation is often installed to meet energy requirements. Appearance may be a factor when insulation is installed on the underside of the planking. When insulation is installed over planking, the insulation should be of the rigid type so that it will not deform under load. Rigid type insulation is usually placed over mastic and is limited in roof slope as recommended by the insulation manufacturer.
Location of the electrical distribution system may present a problem because of the lack of concealed spaces in
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1

2 the ceiling. However, the main supporting beams may be made of several pieces of 2-inch lumber and separated by short blocking, which provides a space to accommodate electrical cable. This is illustrated in Figure 2.
The plank-and-beam system is essentially a skeleton framework. Planks are destined to support a moderate uniformly distributed load. This is carried to the beams, which in turn transmit their loads to posts, which are supported on the foundation. Where heavy concentrated loads occur in places other than over main beams or posts, supplementary beams are needed to carry such loads.
Structural details of the plank-and-beam system of framing are illustrated in Figures 1 through 20.
Foundations for plank-and-beam framing may be continuous walls or piers, supported on adequate footings.
With posts spaced up to 8 feet apart in exterior walls, this system is well adapted to pier foundations for houses without basements.
Posts should be of adequate size to carry the load and large enough to provide full bearing for the ends of beams.
In general, posts should be at least 4x4 inches, nominal.
Where the ends of beams abut over a post, a minimum dimension of 6 inches parallel to the beams is recommended for the post. The posts may be solid or made up of several pieces of 2-inch lumber spiked together.
The size of beams will vary with the span and spacing as indicated in the tables included herein. Beams may be solid, glued laminated pieces, or may be built up of several thinner pieces securely nailed to each other or to spacer blocks between then. When built-up beams are used, a cover plate attached to the underside provides the appearance of a solid piece as illustrated in Figure 3. Fastening of beams to posts is accomplished by framing anchors or angle clips.
Since the 2-inch plank floor or roof frequently serves as the finish ceiling for the room below, appearance as well as structural requirements of the plank should be considered. For the purpose of distributing load, center matched tongued-and-grooved or grooved-for-spline lumber is required. Methods for making the joint to provide various architectural effects are shown in Figure 4. To provide a pleasing appearance, a reasonably good grade of lumber should be selected and it should be sufficiently seasoned to meet the requirements of service conditions so as to avoid large cracks at the joints.
In laying the plank, greater advantage can be taken of the strength and stiffness of the material by making the planks continuous over more than one span. For example, using the same span and uniform load in each case, a plank
PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS which is continuous over two spans is nearly two and onehalf times as stiff as a plank which extends over a single span. Planks should be nailed to each support with a minimum of two 16d nails. The finish floor should be laid at right angles to the plank subfloor, using the same procedure followed in con-ventional construction. Where the underside of the plank is to serve as a ceiling, care is needed to make sure that flooring nails do not penetrate through the plank.
Partitions in the plank-and-beam system usually will be non-bearing. Where bearing partitions occur, they should be placed over beams and the beams enlarged to carry the added load. If this is not possible, supplementary beams must be placed in the floor framing arrangement. Non-bearing partitions, which are parallel to the planks, should have support to carry this load to the beams. This may be accomplished by using two nominal
2x pieces set on edge as the sole plate. Where openings occur in the partition, the two nominal 2x pieces may be placed under the plank floor and supported on the beams by framing anchors. This method is illustrated in Figures
5 and 6. Where the non-bearing partition is at right angles to the planks, no supplementary framing is needed since the partition load will be distributed across a number of planks.
As in conventional framing, lateral bracing is required in the exterior walls to provide resistance against wind and seismic forces. In plank-and-beam framing, this is accomplished by installing solid panels at appropriate intervals wherein the supplementary wall framing and the posts are all tied together by diagonal bracing or suitable sheathing.
Good design requires that all members be properly fastened together in order that the house will act as a unit in resisting external forces. With fewer pieces than in conventional framing, particular care must be given to connections where beams abut each other and where beams join the posts. Where gable roofs are used, provision must be made to absorb the horizontal thrust produced by sloping roof beams. Methods for doing this are shown in the illustrations included herein.
In most cases, structural design of the plank-and-beam house will be controlled by the local building code to the extent of specifying design loading requirements. A live load of 40 pounds per square foot is commonly specified for floors. For roofs, some codes specify 20 pounds per square foot and others 30 pounds per square foot.
To provide adequate safety, all codes require that framing members be so proportioned that the allowable fiber
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WOOD CONSTRUCTION DATA 4 3 stress in bending is not exceeded when the member is subjected to full live and dead loads. However, from the standpoint of appearance, most designers and builders prefer to place some limit on the allowable deflection.
Tables indicating allowable loads for planks and beams will be found herein. Allowable loads for posts will be found in Wood Structural Design Data , a publication of the American Forest and Paper Association.
Design data for plank floors and roofs are included in
Table 1. Computations for bending are based on the live load indicated, plus 10 or 20 pounds per square foot of dead load. Computations for deflection are based on the live load only. Tabulated modulus of elasticity and bending stresses do not account for partial live loading on adjacent and alternate spans. The table shows four general arrangements of planks as follows:
Type A — Extending over a single span.
Type B — Continuous over two equal spans.
Type C — Continuous over three equal spans.
Type D — A combination of Types A and B.
On the basis of a section of planking 12 inches wide the following formulas were used in making the computations:
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4 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
For Type A
For Type B
For TypeC :
:
: M
M
M
= wL 2
=
8 wL 2
=
8 wL 2
10
For Type D : M = wL 2
8 and and and and
∆ =
5 wL 4 (12) 3
384 EI
∆ = wL 4 (12) 3
∆ =
185 EI
4 wL 4 (12) 3
∆ =
581 EI
1 5
2 

 wL 4
384
(12)
EI
3
+ wL 4 (12) 3
185 EI



To use Table 1, first determine the plank arrangement
(Types A, B, C or D), the span, the live load to be supported and the deflection limitation. Then select from the table the corresponding required values for fiber stress in bending (f b
) and modulus of elasticity (E). The plank to be used should be of a grade and species that meets these minimum values. The maximum span for a specific grade and species of plank may be determined by reversing these steps.
For those who prefer to use random length planks (instead of arrangements Type A, B, C or D), similar technical information is included in Heavy Timber Construction
Details , a publication of the American Forest and Paper
Association
Design data for beams are included in Tables 2 through
10. Computations for bending are based on the live load indicated plus 10 or 20 pounds per square foot of dead load. Computations for deflection are based on the live load only. All beams in the table were designed to extend over a single span and the following formulas were used:
:
=
2
8
∆ =
5
4 (12) 3
384
In the preceding formulas and in the tables the symbols have the following meanings: w = load (plf)
L = span (ft.)
M = induced bending moment (lbs.-ft.) f b
= bending stress (psi)
E = modulus of elasticity (lbs.-in.)
I = moment of inertia (in.
4
∆ = deflection (in.)
)
Tabular data provided herein are based on net dimensions (S4S) as listed in American Softwood Lumber
Standard, VPS 20-99.
To use the tables first determine the span, the live load to be supported, and the deflection limitation. Then select from the tables the proper size of beam with the corresponding required values for fiber stress in bending (f b and modulus of elasticity (E). The beam used should be
) of a grade and species that meets these minimum value.
The maximum span for a beam of specific size, grade and species can be determined by reversing these steps.
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WOOD CONSTRUCTION DATA 4
Figure 1 With Conv entional Framing
5
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6 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Figure 2 Use of Spaced Beam to Accommodate Electrical Cable
Figure 3 Methods of Finishing Undersides of Beams
Figure 4 Methods of Treating Joints in Exposed Plank Ceilings
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WOOD CONSTRUCTION DATA 4
Figure 5 Support for Non-bearing Partition Parallel to Plank With Beam
Under Floor
7
Figure 6 Support for Non-bearing Partition Parallel to Plank With Beam
Above Floor
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8 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Figure 7 f or One-story House
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WOOD CONSTRUCTION DATA 4
Figure 8 Plank-and-beam Framing Combined With Conventional Framing in
Two-story House
9
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10 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Figure 9 First Floor Framing at Exterior W all With Beam Bearing on Sill
at Exterior W all With Beam Set in Foundation
W all
Figure 11 Solid Beam Bearing Ov er Basement Post
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WOOD CONSTRUCTION DATA 4
Figure 12 Spaced Beam Bearing Ov er Basement Post
11
Figure 13 Beam Bearing at Second Floor Exterior Wall
Figur e 14 Spaced Beam Bearing at Second Floor Exterior W all
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12 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Floor Ov er Interior Post
Figure 16 Spaced Beam Bearing at Second Floor Ov er Interior Post
Figure 17 Roof Beam and Spaced Floor Beam Bearing at Exterior W all
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WOOD CONSTRUCTION DATA 4
Figure 18 Arrangement of Roof and Floor Beams to Absorb Horizontal Thrust
13
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14 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Figure 19 Bearing of Solid Roof Beam on Exterior Wall Post
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WOOD CONSTRUCTION DATA 4
Figure 20 Methods of Supporting Roof Beam on Ridge Beam to Absorb
Horizontal Thrust
15
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16 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
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WOOD CONSTRUCTION DATA 4
Table 1 Nominal Two-Inch Plank.
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) to support safely a live load of 20, 30, or 40 pounds per square foot within a deflection limitation of L/180, L/240 or
L/360. For instructions on use of table see Design Data for Planks on page 3.
Type A Type B Type C Type D
Plank
Span
(ft.)
6
7
8
20
30
40
L/240
L/360
L/180
L/240
L/360
L/180
L/240
L/360
L/180
L/240
L/360
L/180
Live
Load
(psf)
Deflection
Limitation
L/180
L f b
(psi)
10 psf
DL
20 psf
DL
360 480
20 L/240
L/360
360
360
480
480
580,000
860,000
360
360
L
480
480
L
E
(psi) f b
(psi)
10 psf
DL
20 psf
DL
430,000 360 480
30
L/180
L/240
L/360
L/180
480
480
480
600
600
600
600
720
650,000
860,000
1,300,000
860,000
480
480
480
600
600
600
600
720
40
653
653
817
817
817
640
600
600
490
490
490
653
817
817
980
980
980
853
720
720
653
653
653
817
1,150,000
1,730,000
690,000
910,000
1,370,000
1,030,000
1,370,000
2,060,000
1,370,000
1,830,000
2,740,000
1,020,000
653
653
817
817
817
640
600
600
490
490
490
653
817
817
980
980
980
853
720
720
653
653
653
817
480,000
720,000
280,000
380,000
570,000
430,000
570,000
850,000
570,000
760,000
1,140,000
430,000
L L
E
(psi) f b
(psi)
10 psf
DL
20 psf
DL
180,000 288 384
240,000
360,000
288
288
384
384
270,000
360,000
540,000
360,000
384
384
384
480
480
480
480
576
523
523
653
653
653
512
480
480
392
392
392
523
653
653
784
784
784
683
576
576
523
523
523
653
L
610,000
910,000
360,000
480,000
730,000
540,000
730,000
1,090,000
730,000
970,000
1,450,000
540,000
L L
E
(psi) f b
(psi)
10 psf
DL
20 psf
DL
230,000 360 480
300,000
460,000
360
360
480
480
340,000
460,000
690,000
460,000
480
480
480
600
600
600
600
720
653
653
817
817
817
640
600
600
490
490
490
653
817
817
980
980
980
853
720
720
653
653
653
817
L
E
(psi)
310,000
410,000
610,000
460,000
610,000
920,000
610,000
820,000
1,220,000
490,000
650,000
970,000
730,000
970,000
1,460,000
970,000
1,290,000
1,940,000
720,000
20
30
40
L/240
L/360
L/180
L/240
L/360
L/180
L/240
L/360
640
640
853
853
853
853
1,067
1,067
1,370,000
2,050,000
1,540,000
2,050,000
640
640
853
853
853
853
1,067
1,067
570,000
850,000
640,000
850,000
853 1,067 3,070,000 853 1,067 1,280,000
1,067 1,280 2,050,000 1,067 1,280 850,000
1,067 1,280 2,730,000 1,067 1,280 1,130,000
1,067 1,280 4,100,000 1,067 1,280 1,700,000
512
512
683
683
683
683
853
853
720,000
1,080,000
810,000
1,080,000
640
640
853
853
853
853
1,067
1,067
970,000
1,450,000
1,090,000
1,450,000
683 853 1,620,000 853 1,067 2,170,000
853 1,024 1,080,000 1,067 1,280 1,450,000
853 1,024 1,440,000 1,067 1,280 1,930,000
853 1,024 2,170,000 1,067 1,280 2,900,000
17
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18 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 2 Floor and Roof Beams
3-2x8
2-3x8
1-6x8
1-3x10
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
2-2x12
3-2x8
2-3x8
2-2x10
1-4x10
1-6x8
2-2x10
1-3x10
2-2x8
3-2x8
2-3x8
1-6x8
1-3x10
2-2x10
1-4x10
3-2x10
2-3x10
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
2-3x8
2-2x10
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
1-6x8
2-2x10
1-3x10
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
2-2x10
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,235
1,060
825
740
1,540
1,385
1,180
1,705
1,420
1,215
945
850
1,735
1,490
1,155
1,040
885
1,065
1,280
2,015
1,340
1,210
1,025
1,485
735
710
960
1,755
1,580
1,615
1,385
1,075
970
835
810
615
1,310
1,090
830
745
765
1,540
1,775
1,480
1,270
985
890
755
910
1,090
1,810
2,085
1,070
1,235
1,025
880
685
615
630
1,295
1,490
1,245
1,065
1,650
1,415
1,100
990
2,055
1,850
1,570
2,270
1,895
1,625
1,260
1,135
2,315
1,985
1,545
1,390
1,180
1,420
1,705
2,685
1,790
1,610
1,370
1,980
980
945
1,280
2,340
2,105
2,155
1,845
1,435
1,295
1,115
1,075
815
1,750
1,455
1,105
995
1,020
2,055
2,365
1,975
1,690
1,315
1,185
1,005
1,210
1,455
2,415
2,780
1,430
1,645
1,370
1,175
915
820
840
1,730
1,990
1,655
1,420
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 20 pounds per square foot within a deflection limitation of L/180. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
930,000
800,000
620,000
560,000
460,000
450,000
540,000
1,170,000
780,000
700,000
570,000
670,000
560,000
480,000
370,000
340,000
960,000
860,000
710,000
830,000
690,000
590,000
460,000
410,000
350,000
350,000
380,000
1,160,000
1,040,000
840,000
720,000
560,000
500,000
420,000
420,000
310,000
560,000
470,000
380,000
340,000
270,000
1,010,000
880,000
730,000
630,000
490,000
440,000
360,000
350,000
420,000
1,280,000
1,120,000
580,000
510,000
430,000
360,000
280,000
260,000
200,000
780,000
680,000
570,000
480,000
1,445
1,235
960
865
1,800
1,620
1,375
1,990
1,655
1,420
1,105
995
2,025
1,735
1,350
1,215
1,030
1,245
1,495
2,350
1,565
1,410
1,195
1,730
855
830
1,120
2,045
1,840
1,885
1,615
1,255
1,130
975
940
715
1,530
1,275
965
870
890
1,800
2,070
1,725
1,480
1,150
1,035
880
1,060
1,270
2,110
2,430
1,250
1,440
1,200
1,025
800
720
735
1,510
1,740
1,450
1,245
1,925
1,650
1,285
1,155
2,395
2,155
1,835
2,650
2,210
1,895
1,475
1,325
2,700
2,315
1,800
1,620
1,375
1,660
1,990
3,130
2,090
1,880
1,595
2,310
1,140
1,105
1,495
2,725
2,455
2,515
2,155
1,675
1,510
1,300
1,255
955
2,040
1,700
1,290
1,160
1,190
2,400
2,760
2,300
1,975
1,535
1,380
1,175
1,415
1,695
2,815
3,240
1,665
1,920
1,600
1,370
1,065
960
980
2,015
2,320
1,935
1,655
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
1,090,000
930,000
730,000
650,000
540,000
520,000
630,000
1,360,000
910,000
820,000
670,000
790,000
660,000
560,000
440,000
390,000
1,120,000
1,000,000
820,000
970,000
810,000
690,000
540,000
480,000
410,000
400,000
450,000
1,350,000
1,220,000
980,000
840,000
650,000
590,000
490,000
490,000
360,000
650,000
540,000
440,000
400,000
320,000
1,180,000
1,030,000
860,000
730,000
570,000
510,000
420,000
410,000
500,000
1,500,000
1,310,000
680,000
600,000
500,000
430,000
330,000
300,000
240,000
910,000
790,000
660,000
570,000
1,650
1,415
1,100
990
2,055
1,850
1,570
2,270
1,895
1,625
1,260
1,135
2,315
1,985
1,545
1,390
1,180
1,420
1,705
2,685
1,790
1,610
1,370
1,980
980
945
1,280
2,340
2,105
2,155
1,845
1,435
1,295
1,115
1,075
815
1,750
1,455
1,105
995
1,020
2,055
2,365
1,975
1,690
1,315
1,185
1,005
1,210
1,455
2,415
2,780
1,430
1,645
1,370
1,175
915
820
840
1,730
1,990
1,655
1,420
2,200
1,885
1,465
1,320
2,740
2,465
2,095
3,030
2,525
2,165
1,685
1,515
3,085
2,645
2,060
1,850
1,575
1,895
2,275
3,580
2,385
2,150
1,825
2,640
1,305
1,260
1,705
3,115
2,805
2,870
2,460
1,915
1,725
1,485
1,435
1,090
2,330
1,940
1,475
1,325
1,360
2,740
3,155
2,630
2,255
1,755
1,580
1,340
1,615
1,940
3,220
3,705
1,905
2,190
1,825
1,565
1,220
1,095
1,120
2,305
2,650
2,210
1,895
E
(psi)
1,250,000
1,070,000
830,000
750,000
610,000
600,000
720,000
1,560,000
1,040,000
930,000
770,000
900,000
750,000
640,000
500,000
450,000
1,280,000
1,150,000
940,000
1,110,000
920,000
790,000
610,000
550,000
460,000
460,000
510,000
1,550,000
1,390,000
1,120,000
960,000
750,000
670,000
560,000
560,000
410,000
750,000
620,000
780,000
680,000
570,000
490,000
380,000
340,000
270,000
1,040,000
910,000
750,000
650,000
500,000
450,000
360,000
1,350,000
1,180,000
980,000
840,000
650,000
590,000
480,000
470,000
570,000
1,710,000
1,490,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 2 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
2-3x12
1-6x12
3-2x10
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
1-6x12
2-4x12
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-3x12
3-2x10
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
1-6x12
2-4x12
1-6x10
4-2x10
2-4x10
1-8x10
1-4x12
3-2x12
2-3x12
1-6x12
2-4x12
4-2x12
5-2x12
3-3x12
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,055
1,880
1,615
1,255
1,130
980
805
1,580
1,525
1,310
1,160
1,770
1,705
1,465
1,140
1,025
890
730
1,855
1,670
1,440
1,390
1,195
1,375
1,240
1,080
885
1,035
825
825
1,850
1,540
1,320
1,025
925
805
1,685
1,515
1,305
1,260
1,080
955
1,660
1,380
1,185
920
830
1,520
1,365
1,180
1,140
975
865
1,825
1,565
1,215
1,095
945
910
690
1,480
1,235
1,055
820
2,045
1,755
1,365
1,225
1,055
1,020
775
1,405
2,510
2,150
1,675
1,505
1,310
1,075
2,105
2,035
1,745
1,545
2,360
2,275
1,950
1,515
1,365
1,190
975
2,475
2,225
1,920
1,855
1,590
1,835
1,650
1,435
1,180
1,375
1,100
1,100
2,465
2,055
1,760
1,370
1,230
1,070
2,245
2,020
1,740
1,685
1,445
1,275
2,210
1,845
1,580
1,230
1,105
2,025
1,825
1,570
1,520
1,300
1,150
2,430
2,085
1,620
1,460
1,260
1,215
920
1,975
1,645
1,410
1,095
2,725
2,335
1,820
1,635
1,410
1,365
1,035
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 20 pounds per square foot within a deflection limitation of L/180. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
910,000
780,000
610,000
550,000
460,000
390,000
1,260,000
1,140,000
950,000
950,000
810,000
700,000
1,050,000
900,000
700,000
630,000
540,000
450,000
1,100,000
1,090,000
930,000
800,000
1,040,000
810,000
730,000
620,000
520,000
610,000
480,000
480,000
940,000
780,000
670,000
520,000
470,000
400,000
1,090,000
980,000
820,000
820,000
700,000
600,000
800,000
660,000
570,000
440,000
400,000
940,000
840,000
710,000
700,000
600,000
520,000
1,010,000
860,000
670,000
600,000
510,000
500,000
370,000
670,000
560,000
480,000
370,000
1,190,000
1,020,000
800,000
720,000
600,000
600,000
440,000
1,230
2,195
1,880
1,465
1,315
1,145
940
1,845
1,780
1,525
1,350
2,065
1,990
1,705
1,325
1,195
1,040
855
2,165
1,950
1,680
1,625
1,390
1,605
1,445
1,260
1,035
1,205
965
965
2,155
1,795
1,540
1,200
1,080
940
1,965
1,765
1,525
1,475
1,260
1,115
1,935
1,615
1,380
1,075
970
1,770
1,595
1,375
1,330
1,140
1,010
2,130
1,825
1,420
1,275
1,100
1,065
805
1,725
1,440
1,235
960
2,385
2,045
1,590
1,430
1,235
1,195
905
1,640
2,925
2,510
1,950
1,755
1,530
1,255
2,455
2,375
2,035
1,800
2,755
2,655
2,275
1,770
1,595
1,385
1,140
2,885
2,600
2,240
2,165
1,855
2,140
1,925
1,675
1,375
1,605
1,285
1,285
2,875
2,395
2,055
1,595
1,440
1,250
2,620
2,355
2,030
1,965
1,685
1,490
2,580
2,150
1,845
1,435
1,290
2,365
2,125
1,835
1,770
1,520
1,345
2,835
2,430
1,890
1,700
1,465
1,420
1,075
2,300
1,920
1,645
1,280
3,180
2,725
2,120
1,910
1,645
1,590
1,205
E
(psi) 10 psf DL
Span = 8'-0" f b
(psi)
20 psf DL
1,060,000
910,000
710,000
640,000
540,000
460,000
1,470,000
1,330,000
1,110,000
1,110,000
950,000
820,000
1,230,000
1,050,000
820,000
740,000
630,000
530,000
1,280,000
1,270,000
1,090,000
940,000
1,210,000
940,000
850,000
720,000
610,000
710,000
570,000
570,000
930,000
770,000
660,000
520,000
460,000
1,090,000
980,000
820,000
820,000
700,000
600,000
1,090,000
910,000
780,000
610,000
550,000
460,000
1,270,000
1,150,000
960,000
960,000
820,000
710,000
1,170,000
1,010,000
780,000
700,000
590,000
590,000
430,000
780,000
650,000
560,000
430,000
1,390,000
1,190,000
930,000
840,000
700,000
700,000
510,000
1,405
2,510
2,150
1,675
1,505
1,310
1,075
2,105
2,035
1,745
1,545
2,360
2,275
1,950
1,515
1,365
1,190
975
2,475
2,225
1,920
1,855
1,590
1,835
1,650
1,435
1,180
1,375
1,100
1,100
2,465
2,055
1,760
1,370
1,230
1,070
2,245
2,020
1,740
1,685
1,445
1,275
2,210
1,845
1,580
1,230
1,105
2,025
1,825
1,570
1,520
1,300
1,150
2,430
2,085
1,620
1,460
1,260
1,215
920
1,975
1,645
1,410
1,095
2,725
2,335
1,820
1,635
1,410
1,365
1,035
1,875
3,345
2,865
2,230
2,005
1,745
1,435
2,810
2,715
2,325
2,060
3,145
3,035
2,600
2,025
1,820
1,585
1,300
3,300
2,970
2,560
2,475
2,120
2,445
2,205
1,915
1,575
1,835
1,470
1,470
3,285
2,740
2,345
1,825
1,645
1,430
2,990
2,695
2,320
2,245
1,925
1,700
2,950
2,460
2,105
1,640
1,475
2,700
2,430
2,095
2,025
1,735
1,535
3,245
2,780
2,160
1,945
1,675
1,620
1,230
2,630
2,190
1,880
1,460
3,635
3,115
2,425
2,180
1,880
1,820
1,380
E
(psi)
1,210,000
1,040,000
810,000
730,000
620,000
520,000
1,680,000
1,520,000
1,270,000
1,260,000
1,080,000
930,000
1,400,000
1,200,000
940,000
840,000
720,000
600,000
1,460,000
1,450,000
1,250,000
1,070,000
1,380,000
1,080,000
970,000
820,000
690,000
810,000
650,000
650,000
1,060,000
880,000
760,000
590,000
530,000
1,250,000
1,120,000
940,000
940,000
800,000
690,000
1,250,000
1,040,000
890,000
690,000
620,000
530,000
1,460,000
1,310,000
1,100,000
1,090,000
940,000
810,000
1,340,000
1,150,000
890,000
800,000
680,000
670,000
500,000
890,000
750,000
640,000
500,000
1,590,000
1,360,000
1,060,000
950,000
800,000
800,000
590,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
19

20 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 3 Floor and Roof Beams
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
2-3x6
2-3x8
1-6x8
1-3x10
2-2x10
1-4x10
3-2x10
2-3x10
3-2x8
2-3x8
1-6x8
1-3x10
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
2-2x12
3-2x8
2-3x8
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
2-2x8
1-4x8
3-2x8
2-3x8
1-6x8
2-2x10
1-3x10
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
1-6x8
2-2x10
1-3x10
2-2x8
3-2x8
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
2-2x10
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
2-2x10
2-3x6
1-3x8
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,040
885
1,065
1,280
2,015
1,340
1,210
1,025
1,485
1,235
985
890
755
910
1,090
1,810
2,085
1,735
1,490
1,155
1,065
830
745
765
1,540
1,775
1,480
1,270
1,070
1,235
1,025
880
685
615
630
1,295
1,490
1,245
850
735
710
960
1,755
1,580
1,615
1,385
1,075
970
1,060
825
740
1,540
1,385
1,180
1,705
1,420
1,215
945
835
810
615
1,310
1,090
1,390
1,180
1,420
1,705
2,685
1,790
1,610
1,370
1,980
1,650
1,315
1,185
1,005
1,210
1,455
2,415
2,780
2,315
1,985
1,545
1,420
1,105
995
1,020
2,055
2,365
1,975
1,690
1,430
1,645
1,370
1,175
915
820
840
1,730
1,990
1,655
1,135
980
945
1,280
2,340
2,105
2,155
1,845
1,435
1,295
1,415
1,100
990
2,055
1,850
1,570
2,270
1,895
1,625
1,260
1,115
1,075
815
1,750
1,455
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 20 pounds per square foot within a deflection limitation of L/240. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
650,000
590,000
480,000
470,000
570,000
1,710,000
1,490,000
1,250,000
1,070,000
830,000
750,000
610,000
600,000
720,000
1,560,000
1,040,000
930,000
770,000
900,000
750,000
780,000
680,000
570,000
490,000
380,000
340,000
270,000
1,040,000
910,000
750,000
650,000
500,000
450,000
360,000
1,350,000
1,180,000
980,000
840,000
640,000
500,000
450,000
1,280,000
1,150,000
940,000
1,110,000
920,000
790,000
610,000
550,000
460,000
460,000
510,000
1,550,000
1,390,000
1,120,000
960,000
750,000
670,000
560,000
560,000
410,000
750,000
620,000
1,215
1,030
1,245
1,495
2,350
1,565
1,410
1,195
1,730
1,445
1,150
1,035
880
1,060
1,270
2,110
2,430
2,025
1,735
1,350
1,245
965
870
890
1,800
2,070
1,725
1,480
1,250
1,440
1,200
1,025
800
720
735
1,510
1,740
1,450
995
855
830
1,120
2,045
1,840
1,885
1,615
1,255
1,130
1,235
960
865
1,800
1,620
1,375
1,990
1,655
1,420
1,105
975
940
715
1,530
1,275
1,620
1,375
1,660
1,990
3,130
2,090
1,880
1,595
2,310
1,925
1,535
1,380
1,175
1,415
1,695
2,815
3,240
2,700
2,315
1,800
1,655
1,290
1,160
1,190
2,400
2,760
2,300
1,975
1,665
1,920
1,600
1,370
1,065
960
980
2,015
2,320
1,935
1,325
1,140
1,105
1,495
2,725
2,455
2,515
2,155
1,675
1,510
1,650
1,285
1,155
2,395
2,155
1,835
2,650
2,210
1,895
1,475
1,300
1,255
955
2,040
1,700
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
760,000
690,000
560,000
550,000
660,000
2,000,000
1,740,000
1,450,000
1,250,000
970,000
870,000
720,000
700,000
840,000
1,810,000
1,210,000
1,090,000
890,000
1,050,000
870,000
910,000
790,000
660,000
570,000
440,000
400,000
320,000
1,210,000
1,060,000
880,000
750,000
590,000
530,000
420,000
1,570,000
1,370,000
1,140,000
980,000
750,000
580,000
520,000
1,490,000
1,340,000
1,100,000
1,290,000
1,070,000
920,000
720,000
640,000
540,000
540,000
600,000
1,810,000
1,630,000
1,300,000
1,120,000
870,000
780,000
660,000
650,000
480,000
870,000
720,000
1,390
1,180
1,420
1,705
2,685
1,790
1,610
1,370
1,980
1,650
1,315
1,185
1,005
1,210
1,455
2,415
2,780
2,315
1,985
1,545
1,420
1,105
995
1,020
2,055
2,365
1,975
1,690
1,430
1,645
1,370
1,175
915
820
840
1,730
1,990
1,655
1,135
980
945
1,280
2,340
2,105
2,155
1,845
1,435
1,295
1,415
1,100
990
2,055
1,850
1,570
2,270
1,895
1,625
1,260
1,115
1,075
815
1,750
1,455
1,850
1,575
1,895
2,275
3,580
2,385
2,150
1,825
2,640
2,200
1,755
1,580
1,340
1,615
1,940
3,220
3,705
3,085
2,645
2,060
1,895
1,475
1,325
1,360
2,740
3,155
2,630
2,255
1,905
2,190
1,825
1,565
1,220
1,095
1,120
2,305
2,650
2,210
1,515
1,305
1,260
1,705
3,115
2,805
2,870
2,460
1,915
1,725
1,885
1,465
1,320
2,740
2,465
2,095
3,030
2,525
2,165
1,685
1,485
1,435
1,090
2,330
1,940
E
(psi)
870,000
780,000
640,000
630,000
750,000
2,280,000
1,990,000
1,660,000
1,420,000
1,110,000
1,000,000
820,000
800,000
960,000
2,070,000
1,380,000
1,240,000
1,020,000
1,200,000
1,000,000
1,040,000
910,000
760,000
650,000
500,000
450,000
360,000
1,380,000
1,210,000
1,010,000
860,000
670,000
600,000
480,000
1,790,000
1,570,000
1,310,000
1,120,000
860,000
670,000
600,000
1,700,000
1,530,000
1,260,000
1,470,000
1,230,000
1,050,000
820,000
740,000
620,000
610,000
680,000
2,060,000
1,860,000
1,490,000
1,280,000
990,000
890,000
750,000
750,000
550,000
990,000
830,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 3 Floor and Roof Beams (Cont.)
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 20 pounds per square foot within a deflection limitation of L/240. For instructions on use of table see Design Data For Beams on page 4.
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
2-2x12
1-4x12
3-2x12
2-3x12
1-6x12
3-2x10
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
2-2x12
1-4x12
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-3x12
3-2x10
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
1-3x12
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
3-2x12
2-3x12
1-6x12
2-4x12
1-6x10
4-2x10
2-4x10
1-8x10
1-4x12
3-2x12
2-3x12
1-6x12
2-4x12
4-2x12
5-2x12
3-3x12
3-2x12
2-3x12
1-6x12
2-4x12
3-2x10
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
2-2x12
1-4x12
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,260
1,080
955
1,705
1,465
1,140
1,025
890
730
1,855
1,670
1,440
1,180
1,140
975
865
1,850
1,540
1,320
1,025
925
805
1,685
1,515
1,305
1,755
1,365
1,225
1,055
1,020
775
1,660
1,380
1,185
920
830
1,520
1,365
1,825
1,565
1,215
1,095
945
910
690
1,480
1,235
1,055
820
2,045
1,770
1,375
1,240
1,080
885
1,035
825
825
1,390
1,195
1,055
1,880
1,615
1,255
1,130
980
805
1,580
1,525
1,310
1,160
1,685
1,445
1,275
2,275
1,950
1,515
1,365
1,190
975
2,475
2,225
1,920
1,570
1,520
1,300
1,150
2,465
2,055
1,760
1,370
1,230
1,070
2,245
2,020
1,740
2,335
1,820
1,635
1,410
1,365
1,035
2,210
1,845
1,580
1,230
1,105
2,025
1,825
2,430
2,085
1,620
1,460
1,260
1,215
920
1,975
1,645
1,410
1,095
2,725
2,360
1,835
1,650
1,435
1,180
1,375
1,100
1,100
1,855
1,590
1,405
2,510
2,150
1,675
1,505
1,310
1,075
2,105
2,035
1,745
1,545
E
(psi) 10 psf DL
Span = 7'-0" f b
(psi)
20 psf DL
940,000
940,000
800,000
690,000
1,250,000
1,040,000
890,000
690,000
620,000
530,000
1,460,000
1,310,000
1,100,000
1,090,000
940,000
810,000
1,210,000
1,040,000
810,000
730,000
620,000
520,000
1,680,000
1,520,000
1,270,000
1,340,000
1,150,000
890,000
800,000
680,000
670,000
500,000
890,000
750,000
640,000
500,000
1,590,000
1,360,000
1,060,000
950,000
800,000
800,000
590,000
1,060,000
880,000
760,000
590,000
530,000
1,250,000
1,120,000
1,260,000
1,080,000
930,000
1,400,000
1,200,000
940,000
840,000
720,000
600,000
1,460,000
1,450,000
1,250,000
1,070,000
1,380,000
1,080,000
970,000
820,000
690,000
810,000
650,000
650,000
1,475
1,260
1,115
1,990
1,705
1,325
1,195
1,040
855
2,165
1,950
1,680
1,375
1,330
1,140
1,010
2,155
1,795
1,540
1,200
1,080
940
1,965
1,765
1,525
2,045
1,590
1,430
1,235
1,195
905
1,935
1,615
1,380
1,075
970
1,770
1,595
2,130
1,825
1,420
1,275
1,100
1,065
805
1,725
1,440
1,235
960
2,385
2,065
1,605
1,445
1,260
1,035
1,205
965
965
1,625
1,390
1,230
2,195
1,880
1,465
1,315
1,145
940
1,845
1,780
1,525
1,350
1,965
1,685
1,490
2,655
2,275
1,770
1,595
1,385
1,140
2,885
2,600
2,240
1,835
1,770
1,520
1,345
2,875
2,395
2,055
1,595
1,440
1,250
2,620
2,355
2,030
2,725
2,120
1,910
1,645
1,590
1,205
2,580
2,150
1,845
1,435
1,290
2,365
2,125
2,835
2,430
1,890
1,700
1,465
1,420
1,075
2,300
1,920
1,645
1,280
3,180
2,755
2,140
1,925
1,675
1,375
1,605
1,285
1,285
2,165
1,855
1,640
2,925
2,510
1,950
1,755
1,530
1,255
2,455
2,375
2,035
1,800
E
(psi) 10 psf DL
Span = 8'-0" f b
(psi)
20 psf DL
1,100,000
1,090,000
940,000
810,000
1,460,000
1,210,000
1,040,000
810,000
730,000
620,000
1,700,000
1,530,000
1,280,000
1,270,000
1,090,000
940,000
1,420,000
1,210,000
940,000
850,000
720,000
610,000
1,970,000
1,770,000
1,480,000
1,560,000
1,340,000
1,040,000
940,000
790,000
780,000
580,000
1,040,000
870,000
750,000
580,000
1,860,000
1,590,000
1,240,000
1,110,000
930,000
930,000
690,000
1,240,000
1,030,000
880,000
690,000
620,000
1,460,000
1,310,000
1,470,000
1,260,000
1,090,000
1,640,000
1,400,000
1,090,000
980,000
840,000
700,000
1,710,000
1,700,000
1,450,000
1,250,000
1,620,000
1,260,000
1,130,000
960,000
810,000
940,000
750,000
750,000
1,685
1,445
1,275
2,275
1,950
1,515
1,365
1,190
975
2,475
2,225
1,920
1,570
1,520
1,300
1,150
2,465
2,055
1,760
1,370
1,230
1,070
2,245
2,020
1,740
2,335
1,820
1,635
1,410
1,365
1,035
2,210
1,845
1,580
1,230
1,105
2,025
1,825
2,430
2,085
1,620
1,460
1,260
1,215
920
1,975
1,645
1,410
1,095
2,725
2,360
1,835
1,650
1,435
1,180
1,375
1,100
1,100
1,855
1,590
1,405
2,510
2,150
1,675
1,505
1,310
1,075
2,105
2,035
1,745
1,545
2,245
1,925
1,700
3,035
2,600
2,025
1,820
1,585
1,300
3,300
2,970
2,560
2,095
2,025
1,735
1,535
3,285
2,740
2,345
1,825
1,645
1,430
2,990
2,695
2,320
3,115
2,425
2,180
1,880
1,820
1,380
2,950
2,460
2,105
1,640
1,475
2,700
2,430
3,245
2,780
2,160
1,945
1,675
1,620
1,230
2,630
2,190
1,880
1,460
3,635
3,145
2,445
2,205
1,915
1,575
1,835
1,470
1,470
2,475
2,120
1,875
3,345
2,865
2,230
2,005
1,745
1,435
2,810
2,715
2,325
2,060
E
(psi)
1,260,000
1,250,000
1,070,000
920,000
1,660,000
1,390,000
1,190,000
920,000
830,000
710,000
1,940,000
1,750,000
1,470,000
1,460,000
1,250,000
1,070,000
1,620,000
1,390,000
1,080,000
970,000
830,000
690,000
2,250,000
2,020,000
1,700,000
1,790,000
1,530,000
1,190,000
1,070,000
900,000
890,000
660,000
1,190,000
990,000
850,000
660,000
2,120,000
1,820,000
1,410,000
1,270,000
1,070,000
1,060,000
780,000
1,420,000
1,180,000
1,010,000
790,000
710,000
1,660,000
1,500,000
1,680,000
1,440,000
1,240,000
1,870,000
1,610,000
1,250,000
1,120,000
960,000
800,000
1,950,000
1,940,000
1,660,000
1,430,000
1,850,000
1,440,000
1,290,000
1,100,000
920,000
1,080,000
860,000
860,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
21

22 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 4 Floor and Roof Beams
2-2x8
1-4x8
3-2x8
2-3x8
1-6x8
2-2x10
1-3x10
1-4x10
3-2x8
2-3x8
1-6x8
1-3x10
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
2-2x12
3-2x8
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
1-6x8
2-3x6
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
1-6x8
1-3x8
2-2x8
1-4x8
3-2x8
2-3x8
1-6x8
2-2x10
1-3x10
2-3x8
1-6x8
1-3x10
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
2-2x12
1-4x12
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-3x12
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,540
1,385
1,180
1,705
1,420
1,215
945
850
735
710
960
825
1,615
1,385
1,075
970
835
810
615
1,310
1,090
935
730
655
1,340
1,210
1,025
1,485
1,235
1,060
825
740
640
620
835
1,735
1,490
1,155
1,040
885
1,065
1,280
915
1,775
1,480
1,270
985
890
755
910
1,090
1,070
1,235
1,025
880
685
615
525
1,295
1,490
1,245
1,065
830
745
635
2,055
1,850
1,570
2,270
1,895
1,625
1,260
1,135
980
945
1,280
1,095
2,155
1,845
1,435
1,295
1,115
1,075
815
1,750
1,455
1,250
970
875
1,790
1,610
1,370
1,980
1,650
1,415
1,100
990
855
825
1,115
2,315
1,985
1,545
1,390
1,180
1,420
1,705
1,220
2,365
1,975
1,690
1,315
1,185
1,005
1,210
1,455
1,430
1,645
1,370
1,175
915
820
700
1,730
1,990
1,655
1,420
1,105
995
845
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 20 pounds per square foot within a deflection limitation of L/360. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
1,760,000
1,470,000
1,260,000
980,000
880,000
720,000
710,000
850,000
1,870,000
1,600,000
1,250,000
1,120,000
920,000
900,000
1,080,000
770,000
1,560,000
1,400,000
1,150,000
1,350,000
1,120,000
960,000
750,000
670,000
570,000
560,000
620,000
1,910,000
1,720,000
1,410,000
1,660,000
1,380,000
1,180,000
920,000
830,000
700,000
690,000
770,000
660,000
1,680,000
1,440,000
1,120,000
1,010,000
840,000
840,000
620,000
1,120,000
930,000
800,000
620,000
560,000
1,170,000
1,020,000
850,000
730,000
570,000
510,000
420,000
1,560,000
1,360,000
1,130,000
970,000
750,000
680,000
560,000
1,800
1,620
1,375
1,990
1,655
1,420
1,105
995
855
830
1,120
960
1,885
1,615
1,255
1,130
975
940
715
1,530
1,275
1,090
850
765
1,565
1,410
1,195
1,730
1,445
1,235
960
865
745
720
975
2,025
1,735
1,350
1,215
1,030
1,245
1,495
1,065
2,070
1,725
1,480
1,150
1,035
880
1,060
1,270
1,250
1,440
1,200
1,025
800
720
610
1,510
1,740
1,450
1,245
965
870
740
2,395
2,155
1,835
2,650
2,210
1,895
1,475
1,325
1,140
1,105
1,495
1,280
2,515
2,155
1,675
1,510
1,300
1,255
955
2,040
1,700
1,455
1,135
1,020
2,090
1,880
1,595
2,310
1,925
1,650
1,285
1,155
995
960
1,300
2,700
2,315
1,800
1,620
1,375
1,660
1,990
1,420
2,760
2,300
1,975
1,535
1,380
1,175
1,415
1,695
1,665
1,920
1,600
1,370
1,065
960
815
2,015
2,320
1,935
1,655
1,290
1,160
985
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
2,060,000
1,710,000
1,470,000
1,140,000
1,030,000
840,000
830,000
990,000
2,180,000
1,870,000
1,450,000
1,310,000
1,070,000
1,050,000
1,260,000
900,000
1,810,000
1,630,000
1,340,000
1,570,000
1,310,000
1,120,000
870,000
790,000
660,000
660,000
730,000
2,230,000
2,010,000
1,650,000
1,930,000
1,610,000
1,380,000
1,070,000
970,000
810,000
810,000
900,000
770,000
1,960,000
1,680,000
1,300,000
1,170,000
980,000
980,000
720,000
1,300,000
1,090,000
930,000
720,000
650,000
1,360,000
1,190,000
990,000
850,000
660,000
600,000
490,000
1,810,000
1,580,000
1,320,000
1,130,000
880,000
790,000
650,000
2,055
1,850
1,570
2,270
1,895
1,625
1,260
1,135
980
945
1,280
1,095
2,155
1,845
1,435
1,295
1,115
1,075
815
1,750
1,455
1,250
970
875
1,790
1,610
1,370
1,980
1,650
1,415
1,100
990
855
825
1,115
2,315
1,985
1,545
1,390
1,180
1,420
1,705
1,220
2,365
1,975
1,690
1,315
1,185
1,005
1,210
1,455
1,430
1,645
1,370
1,175
915
820
700
1,730
1,990
1,655
1,420
1,105
995
845
2,740
2,465
2,095
3,030
2,525
2,165
1,685
1,515
1,305
1,260
1,705
1,465
2,870
2,460
1,915
1,725
1,485
1,435
1,090
2,330
1,940
1,665
1,295
1,165
2,385
2,150
1,825
2,640
2,200
1,885
1,465
1,320
1,135
1,100
1,485
3,085
2,645
2,060
1,850
1,575
1,895
2,275
1,625
3,155
2,630
2,255
1,755
1,580
1,340
1,615
1,940
1,905
2,190
1,825
1,565
1,220
1,095
930
2,305
2,650
2,210
1,895
1,475
1,325
1,125
E
(psi)
2,350,000
1,960,000
1,680,000
1,310,000
1,180,000
970,000
940,000
1,130,000
2,490,000
2,130,000
1,660,000
1,490,000
1,230,000
1,200,000
1,440,000
1,030,000
2,070,000
1,870,000
1,530,000
1,800,000
1,500,000
1,280,000
1,000,000
900,000
750,000
750,000
830,000
2,550,000
2,300,000
1,880,000
2,210,000
1,840,000
1,580,000
1,230,000
1,110,000
930,000
920,000
1,020,000
880,000
2,240,000
1,920,000
1,490,000
1,340,000
1,130,000
1,120,000
830,000
1,490,000
1,240,000
1,070,000
830,000
750,000
1,560,000
1,360,000
1,130,000
970,000
760,000
680,000
560,000
2,070,000
1,810,000
1,510,000
1,290,000
1,010,000
910,000
740,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 4 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,390
1,195
1,055
1,615
1,255
1,130
980
940
805
755
720
1,305
1,260
1,080
955
1,705
1,465
1,140
1,025
890
855
730
570
1,310
1,160
1,375
1,240
1,080
1,035
885
825
825
790
625
740
1,365
1,225
1,055
1,020
775
1,660
1,380
1,185
920
830
1,825
1,565
1,215
1,095
945
910
690
1,480
1,235
1,055
820
720
690
1,520
1,365
1,180
1,140
975
865
1,540
1,320
1,025
925
805
770
1,515
1,855
1,590
1,405
2,150
1,675
1,505
1,310
1,255
1,075
1,005
960
1,740
1,685
1,445
1,275
2,275
1,950
1,515
1,365
1,190
1,140
975
760
1,745
1,545
1,835
1,650
1,435
1,375
1,180
1,100
1,100
1,055
830
985
1,820
1,635
1,410
1,365
1,035
2,210
1,845
1,580
1,230
1,105
2,430
2,085
1,620
1,460
1,260
1,215
920
1,975
1,645
1,410
1,095
960
920
2,025
1,825
1,570
1,520
1,300
1,150
2,055
1,760
1,370
1,230
1,070
1,025
2,020
2-4x12
4-2x10
2-4x10
1-8x10
1-4x12
3-2x12
2-3x12
1-6x12
4-2x12
2-4x12
3-3x12
1-4x12
3-2x12
2-3x12
1-6x12
4-2x12
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
1-6x12
4-2x12
1-8x12
1-10x12
2-4x10
1-8x10
3-2x12
2-3x12
1-6x12
4-2x12
2-4x12
5-2x12
3-3x12
1-8x12
1-10x12
2-2x10
1-4x10
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-3x12
3-2x10
2-3x10
1-6x10
4-2x10
1-8x10
1-3x12
2-2x12
1-4x12
3-2x12
2-3x12
1-6x12
4-2x12
3-2x10
2-3x10
1-6x10
4-2x10
2-4x10
1-8x10
2-2x12
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 20 pounds per square foot within a deflection limitation of L/360. For instructions on use of table see Design Data For Beams on page 4.
E
(psi) 10 psf DL
Span = 7'-0" f b
(psi)
20 psf DL
1,650,000
1,640,000
1,400,000
1,210,000
1,820,000
1,560,000
1,210,000
1,090,000
930,000
910,000
780,000
1,900,000
1,620,000
1,400,000
1,810,000
1,400,000
1,260,000
1,080,000
1,050,000
900,000
840,000
790,000
620,000
1,870,000
1,610,000
1,620,000
1,450,000
1,240,000
1,210,000
1,040,000
970,000
970,000
910,000
716,290
2,010,000
1,720,000
1,340,000
1,210,000
1,010,000
1,010,000
740,000
1,340,000
1,120,000
960,000
750,000
670,000
1,590,000
1,430,000
1,200,000
1,190,000
880,000
1,590,000
1,330,000
1,140,000
880,000
800,000
680,000
660,000
1,870,000
1,680,000
1,410,000
1,400,000
1,200,000
1,040,000
1,560,000
1,340,000
1,040,000
940,000
800,000
780,000
1,960,000
1,625
1,390
1,230
1,880
1,465
1,315
1,145
1,100
940
880
840
1,525
1,475
1,260
1,115
1,990
1,705
1,325
1,195
1,040
995
855
665
1,525
1,350
1,605
1,445
1,260
1,205
1,035
965
965
920
730
865
1,590
1,430
1,235
1,195
905
1,935
1,615
1,380
1,075
970
2,130
1,825
1,420
1,275
1,100
1,065
805
1,725
1,440
1,235
960
840
805
1,770
1,595
1,375
1,330
1,140
1,010
1,795
1,540
1,200
1,080
940
900
1,765
2,165
1,855
1,640
2,510
1,950
1,755
1,530
1,465
1,255
1,170
1,120
2,030
1,965
1,685
1,490
2,655
2,275
1,770
1,595
1,385
1,325
1,140
885
2,035
1,800
2,140
1,925
1,675
1,605
1,375
1,285
1,285
1,230
970
1,150
2,120
1,910
1,645
1,590
1,205
2,580
2,150
1,845
1,435
1,290
2,835
2,430
1,890
1,700
1,465
1,420
1,075
2,300
1,920
1,645
1,280
1,125
1,075
2,365
2,125
1,835
1,770
1,520
1,345
2,395
2,055
1,595
1,440
1,250
1,200
2,355
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
1,920,000
1,910,000
1,640,000
1,410,000
2,120,000
1,820,000
1,420,000
1,270,000
1,080,000
1,060,000
910,000
2,210,000
1,900,000
1,630,000
2,110,000
1,640,000
1,480,000
1,260,000
1,230,000
1,050,000
980,000
920,000
730,000
2,180,000
1,880,000
1,880,000
1,700,000
1,440,000
1,410,000
1,210,000
1,130,000
1,130,000
1,060,000
840,000
2,350,000
2,010,000
1,560,000
1,410,000
1,180,000
1,170,000
870,000
1,570,000
1,300,000
1,120,000
870,000
780,000
1,860,000
1,670,000
1,400,000
1,390,000
1,030,000
1,860,000
1,550,000
1,330,000
1,030,000
930,000
790,000
770,000
2,180,000
1,970,000
1,650,000
1,640,000
1,400,000
1,210,000
1,820,000
1,560,000
1,210,000
1,090,000
930,000
910,000
2,290,000
1,855
1,590
1,405
2,150
1,675
1,505
1,310
1,255
1,075
1,005
960
1,740
1,685
1,445
1,275
2,275
1,950
1,515
1,365
1,190
1,140
975
760
1,745
1,545
1,835
1,650
1,435
1,375
1,180
1,100
1,100
1,055
830
985
1,820
1,635
1,410
1,365
1,035
2,210
1,845
1,580
1,230
1,105
2,430
2,085
1,620
1,460
1,260
1,215
920
1,975
1,645
1,410
1,095
960
920
2,025
1,825
1,570
1,520
1,300
1,150
2,055
1,760
1,370
1,230
1,070
1,025
2,020
2,475
2,120
1,875
2,865
2,230
2,005
1,745
1,675
1,435
1,340
1,280
2,320
2,245
1,925
1,700
3,035
2,600
2,025
1,820
1,585
1,515
1,300
1,010
2,325
2,060
2,445
2,205
1,915
1,835
1,575
1,470
1,470
1,405
1,110
1,315
2,425
2,180
1,880
1,820
1,380
2,950
2,460
2,105
1,640
1,475
3,245
2,780
2,160
1,945
1,675
1,620
1,230
2,630
2,190
1,880
1,460
1,285
1,230
2,700
2,430
2,095
2,025
1,735
1,535
2,740
2,345
1,825
1,645
1,430
1,370
2,695
E
(psi)
2,200,000
2,180,000
1,870,000
1,610,000
2,430,000
2,080,000
1,620,000
1,460,000
1,240,000
1,210,000
1,040,000
2,530,000
2,170,000
1,870,000
2,410,000
1,870,000
1,690,000
1,430,000
1,400,000
1,200,000
1,120,000
1,050,000
830,000
2,490,000
2,150,000
2,150,000
1,940,000
1,650,000
1,620,000
1,380,000
1,290,000
1,290,000
1,210,000
960,000
2,680,000
2,300,000
1,790,000
1,610,000
1,350,000
1,340,000
990,000
1,790,000
1,490,000
1,280,000
990,000
890,000
2,120,000
1,910,000
1,600,000
1,590,000
1,180,000
2,120,000
1,770,000
1,520,000
1,180,000
1,060,000
900,000
880,000
2,500,000
2,250,000
1,880,000
1,870,000
1,600,000
1,380,000
2,080,000
1,780,000
1,390,000
1,250,000
1,060,000
1,040,000
2,620,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
23

24 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 5 Floor and Roof Beams
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
945
720
1,280
1,095
2,155
1,435
1,295
1,845
1,115
925
1,075
815
1,455
1,250
970
875
855
705
1,320
1,570
1,895
1,260
1,135
1,625
980
810
1,220
1,790
1,610
1,150
1,370
1,650
1,100
990
1,415
1,105
995
710
1,020
1,690
1,315
1,185
845
1,005
1,210
1,430
1,645
1,175
915
820
585
840
1,730
1,990
1,420
810
725
1,985
1,545
1,390
990
1,180
1,420
950
855
1,185
900
1,600
1,370
2,695
1,795
1,615
2,310
1,390
1,155
1,345
1,020
1,820
1,560
1,215
1,090
1,065
885
1,650
1,965
2,365
1,580
1,420
2,030
1,225
1,015
1,525
2,235
2,015
1,440
1,710
2,060
1,375
1,235
1,765
1,380
1,245
890
1,275
2,115
1,645
1,480
1,055
1,255
1,515
1,785
2,055
1,470
1,140
1,025
735
1,050
2,160
2,485
1,775
1,010
910
2,480
1,930
1,735
1,240
1,475
1,780
1,185
1,065
1-4x12
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
3-2x10
2-3x10
1-4x10
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
2-4x10
2-4x8
1-6x8
2-2x10
1-4x8
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
3-2x10
2-3x10
1-4x8
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
2-3x6
1-3x8
1-4x8
3-2x8
2-3x8
2-4x8
2-2x10
2-3x6
1-3x8
1-4x8
3-2x8
2-3x8
2-4x8
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 30 pounds per square foot within a deflection limitation of L/180. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
520,000
380,000
580,000
490,000
1,260,000
840,000
750,000
1,080,000
630,000
540,000
630,000
460,000
700,000
600,000
470,000
420,000
580,000
1,170,000
1,050,000
750,000
860,000
840,000
560,000
510,000
720,000
420,000
360,000
920,000
1,060,000
1,040,000
690,000
620,000
890,000
520,000
440,000
880,000
770,000
550,000
430,000
380,000
270,000
310,000
1,170,000
1,020,000
730,000
570,000
510,000
360,000
410,000
940,000
730,000
660,000
470,000
540,000
530,000
350,000
320,000
1,200,000
930,000
840,000
600,000
690,000
670,000
450,000
400,000
1,105
840
1,495
1,280
2,515
1,675
1,510
2,155
1,300
1,075
1,255
955
1,700
1,455
1,135
1,020
995
825
1,540
1,835
2,210
1,475
1,325
1,895
1,140
945
1,420
2,090
1,880
1,340
1,595
1,925
1,285
1,155
1,650
1,290
1,160
830
1,190
1,975
1,535
1,380
985
1,175
1,415
1,665
1,920
1,370
1,065
960
685
980
2,015
2,320
1,655
940
850
2,315
1,800
1,620
1,155
1,375
1,660
1,105
995
1,380
1,045
1,865
1,600
3,140
2,095
1,885
2,695
1,625
1,345
1,570
1,190
2,125
1,820
1,415
1,275
1,245
1,030
1,925
2,290
2,760
1,840
1,655
2,365
1,430
1,185
1,780
2,610
2,350
1,680
1,995
2,405
1,605
1,445
2,060
1,610
1,450
1,035
1,485
2,465
1,920
1,725
1,235
1,465
1,765
2,085
2,395
1,710
1,330
1,200
855
1,225
2,520
2,900
2,070
1,180
1,060
2,895
2,250
2,025
1,445
1,720
2,075
1,385
1,245
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
600,000
450,000
670,000
580,000
1,470,000
980,000
880,000
1,260,000
740,000
630,000
730,000
540,000
820,000
700,000
540,000
490,000
670,000
1,360,000
1,220,000
870,000
1,010,000
980,000
660,000
590,000
840,000
490,000
420,000
1,080,000
1,240,000
1,210,000
810,000
730,000
1,040,000
610,000
520,000
1,020,000
890,000
640,000
500,000
450,000
320,000
360,000
1,360,000
1,190,000
850,000
660,000
590,000
420,000
480,000
1,100,000
860,000
770,000
550,000
630,000
620,000
410,000
370,000
1,400,000
1,090,000
980,000
700,000
810,000
790,000
520,000
470,000
1,260
955
1,705
1,465
2,870
1,915
1,725
2,460
1,485
1,230
1,435
1,090
1,940
1,665
1,295
1,165
1,135
940
1,760
2,095
2,525
1,685
1,515
2,165
1,305
1,080
1,625
2,385
2,150
1,535
1,825
2,200
1,465
1,320
1,885
1,475
1,325
945
1,360
2,255
1,755
1,580
1,125
1,340
1,615
1,905
2,190
1,565
1,220
1,095
785
1,120
2,305
2,650
1,895
1,075
970
2,645
2,060
1,850
1,325
1,575
1,895
1,265
1,140
1,580
1,195
2,135
1,830
3,590
2,395
2,155
3,075
1,855
1,540
1,795
1,360
2,425
2,080
1,620
1,455
1,420
1,180
2,200
2,620
3,155
2,105
1,895
2,705
1,630
1,350
2,030
2,985
2,685
1,920
2,280
2,750
1,835
1,650
2,355
1,840
1,655
1,185
1,695
2,820
2,190
1,975
1,410
1,675
2,020
2,380
2,740
1,955
1,520
1,370
980
1,400
2,880
3,315
2,370
1,345
1,210
3,305
2,570
2,315
1,655
1,965
2,370
1,580
1,420
E
(psi)
690,000
510,000
770,000
660,000
1,680,000
1,120,000
1,010,000
1,440,000
840,000
720,000
840,000
620,000
930,000
800,000
620,000
560,000
770,000
1,560,000
1,400,000
1,000,000
1,150,000
1,120,000
750,000
670,000
960,000
570,000
480,000
1,230,000
1,410,000
1,380,000
920,000
830,000
1,180,000
700,000
590,000
1,170,000
1,020,000
730,000
570,000
510,000
360,000
410,000
1,560,000
1,360,000
970,000
750,000
680,000
480,000
540,000
1,260,000
980,000
880,000
630,000
720,000
710,000
470,000
420,000
1,600,000
1,250,000
1,120,000
800,000
920,000
900,000
600,000
540,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 5 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
910
1,190
910
870
690
685
1,405
1,675
1,505
1,255
1,075
1,005
1,310
1,005
960
760
755
1,085
1,650
1,375
1,180
1,100
1,435
1,100
1,055
830
825
1,190
1,045
795
820
1,105
920
790
735
1,300
1,520
1,150
1,760
1,370
1,230
1,025
880
820
1,070
820
785
1,685
1,275
1,515
1,365
1,140
975
1,620
1,460
2,085
1,260
1,040
1,215
920
1,645
1,410
1,095
985
820
1,635
1,410
1,170
1,365
1,035
1,845
1,580
1,230
1,140
1,485
1,140
1,090
860
855
1,760
2,090
1,880
1,570
1,345
1,255
1,635
1,255
1,200
950
940
1,355
2,065
1,720
1,475
1,375
1,795
1,375
1,320
1,040
1,035
1,490
1,305
990
1,025
1,380
1,150
985
920
1,625
1,900
1,440
2,200
1,710
1,540
1,285
1,100
1,025
1,340
1,025
985
2,105
1,595
1,895
1,705
1,420
1,220
2,025
1,825
2,605
1,570
1,305
1,520
1,155
2,055
1,760
1,370
1,235
1,030
2,045
1,760
1,460
1,705
1,290
2,305
1,975
1,535
3-2x10
2-4x12
5-2x12
2-4x10
4-2x10
1-8x10
1-4x12
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
4-2x10
1-8x10
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
1-10x12
4-3x12
1-8x10
3-2x12
2-3x12
4-2x12
2-3x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
4-2x12
2-3x10
1-4x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
1-10x12
4-3x12
2-3x14
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
1-10x12
4-3x12
2-3x14
1-6x14
3-3x14
2-4x14
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 20 pounds per square foot within a deflection limitation of L/360. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
550,000
700,000
550,000
510,000
400,000
410,000
1,050,000
1,050,000
950,000
790,000
680,000
630,000
810,000
630,000
590,000
470,000
470,000
580,000
1,090,000
910,000
780,000
730,000
930,000
730,000
680,000
540,000
550,000
670,000
570,000
440,000
450,000
600,000
500,000
430,000
400,000
900,000
1,050,000
780,000
1,000,000
780,000
700,000
590,000
500,000
470,000
600,000
470,000
440,000
1,230,000
910,000
910,000
820,000
680,000
590,000
1,010,000
910,000
1,290,000
760,000
650,000
750,000
560,000
840,000
720,000
560,000
500,000
420,000
1,070,000
900,000
770,000
900,000
660,000
1,000,000
850,000
660,000
1,060
1,385
1,060
1,015
800
795
1,640
1,950
1,755
1,465
1,255
1,170
1,530
1,170
1,120
885
880
1,265
1,925
1,605
1,375
1,285
1,675
1,285
1,230
970
965
1,390
1,215
925
955
1,290
1,075
920
860
1,520
1,770
1,345
2,055
1,595
1,440
1,200
1,025
960
1,250
960
915
1,965
1,490
1,770
1,595
1,325
1,140
1,890
1,700
2,430
1,465
1,215
1,420
1,075
1,920
1,645
1,280
1,150
960
1,910
1,645
1,365
1,590
1,205
2,150
1,845
1,435
1,325
1,730
1,325
1,270
1,005
995
2,050
2,440
2,195
1,830
1,570
1,465
1,910
1,465
1,400
1,105
1,100
1,585
2,410
2,010
1,720
1,605
2,095
1,605
1,535
1,215
1,205
1,735
1,520
1,160
1,195
1,615
1,345
1,150
1,075
1,900
2,215
1,680
2,565
1,995
1,795
1,495
1,285
1,200
1,565
1,200
1,145
2,455
1,860
2,210
1,990
1,660
1,420
2,365
2,130
3,040
1,835
1,520
1,775
1,345
2,400
2,055
1,600
1,440
1,200
2,385
2,055
1,705
1,990
1,510
2,690
2,305
1,790
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
640,000
810,000
640,000
600,000
470,000
480,000
1,220,000
1,230,000
1,110,000
920,000
790,000
740,000
940,000
740,000
690,000
550,000
550,000
680,000
1,270,000
1,060,000
910,000
850,000
1,080,000
850,000
790,000
630,000
640,000
780,000
670,000
520,000
530,000
700,000
580,000
500,000
460,000
1,050,000
1,230,000
910,000
1,170,000
910,000
820,000
680,000
590,000
550,000
700,000
550,000
510,000
1,430,000
1,060,000
1,060,000
960,000
800,000
680,000
1,170,000
1,060,000
1,510,000
890,000
750,000
880,000
650,000
980,000
840,000
650,000
590,000
490,000
1,250,000
1,050,000
900,000
1,040,000
770,000
1,160,000
1,000,000
770,000
1,215
1,585
1,215
1,160
915
910
1,875
2,230
2,005
1,675
1,435
1,340
1,745
1,340
1,280
1,010
1,005
1,445
2,205
1,835
1,575
1,470
1,915
1,470
1,405
1,110
1,100
1,590
1,390
1,060
1,095
1,475
1,230
1,055
985
1,735
2,025
1,535
2,345
1,825
1,645
1,370
1,175
1,095
1,430
1,095
1,050
2,245
1,700
2,025
1,820
1,515
1,300
2,160
1,945
2,780
1,675
1,390
1,620
1,230
2,190
1,880
1,460
1,315
1,095
2,180
1,880
1,560
1,820
1,380
2,460
2,105
1,640
1,515
1,980
1,515
1,450
1,145
1,140
2,345
2,790
2,510
2,090
1,790
1,675
2,185
1,675
1,600
1,265
1,255
1,810
2,755
2,295
1,965
1,835
2,395
1,835
1,755
1,385
1,375
1,985
1,740
1,325
1,365
1,845
1,535
1,315
1,230
2,170
2,530
1,920
2,935
2,280
2,055
1,710
1,465
1,370
1,785
1,370
1,310
2,805
2,125
2,530
2,275
1,895
1,625
2,700
2,430
3,475
2,095
1,735
2,025
1,535
2,740
2,350
1,825
1,645
1,370
2,725
2,350
1,945
2,270
1,725
3,070
2,635
2,050
E
(psi)
730,000
930,000
730,000
680,000
540,000
550,000
1,400,000
1,400,000
1,260,000
1,050,000
900,000
840,000
1,080,000
840,000
790,000
620,000
630,000
770,000
1,450,000
1,210,000
1,040,000
970,000
1,240,000
970,000
910,000
720,000
730,000
890,000
760,000
590,000
600,000
800,000
660,000
570,000
530,000
1,200,000
1,400,000
1,040,000
1,340,000
1,040,000
940,000
780,000
670,000
620,000
800,000
620,000
580,000
1,640,000
1,210,000
1,210,000
1,090,000
910,000
780,000
1,340,000
1,210,000
1,720,000
1,010,000
860,000
1,010,000
740,000
1,120,000
960,000
750,000
670,000
560,000
1,430,000
1,200,000
1,020,000
1,190,000
880,000
1,330,000
1,140,000
880,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
25

26 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 6 Floor and Roof Beams
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,135
1,625
980
810
945
720
1,280
1,095
2,155
1,100
990
1,415
855
705
1,320
1,570
1,895
1,260
1,435
1,295
1,845
1,115
925
1,075
815
1,455
1,250
970
875
1,420
950
855
1,220
1,790
1,610
1,150
1,370
1,650
1,005
1,210
810
725
1,985
1,545
1,390
990
1,180
1,420
1,105
995
710
1,020
1,690
1,315
1,185
845
1,430
1,645
1,175
915
820
585
840
1,730
1,990
1,420
2,030
1,225
1,015
1,185
900
1,600
1,370
2,695
1,375
1,235
1,765
1,065
885
1,650
1,965
2,365
1,580
1,795
1,615
2,310
1,390
1,155
1,345
1,020
1,820
1,560
1,215
1,090
1,780
1,185
1,065
1,525
2,235
2,015
1,440
1,710
2,060
1,255
1,515
1,010
910
2,480
1,930
1,735
1,240
1,475
1,775
1,380
1,245
890
1,275
2,115
1,645
1,480
1,055
1,785
2,055
1,470
1,140
1,025
735
1,050
2,160
2,485
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
1-6x10
2-4x10
2-4x8
1-6x8
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
1-4x10
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
3-2x10
2-3x10
1-4x10
2-3x10
1-4x8
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
3-2x10
2-3x10
2-4x8
2-2x10
1-4x8
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
3-2x10
2-3x6
1-3x8
1-4x8
3-2x8
2-3x8
2-4x8
2-2x10
2-3x6
1-3x8
1-4x8
3-2x8
2-3x8
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 30 pounds per square foot within a deflection limitation of L/240. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
750,000
670,000
960,000
570,000
480,000
1,230,000
1,410,000
1,380,000
920,000
830,000
1,180,000
700,000
590,000
690,000
510,000
770,000
660,000
1,680,000
1,120,000
1,010,000
1,440,000
840,000
720,000
840,000
620,000
930,000
800,000
620,000
560,000
720,000
710,000
470,000
420,000
1,600,000
1,250,000
1,120,000
800,000
920,000
900,000
600,000
540,000
770,000
1,560,000
1,400,000
1,000,000
1,150,000
1,120,000
1,170,000
1,020,000
730,000
570,000
510,000
360,000
410,000
1,560,000
1,360,000
970,000
750,000
680,000
480,000
540,000
1,260,000
980,000
880,000
630,000
1,325
1,895
1,140
945
1,105
840
1,495
1,280
2,515
1,285
1,155
1,650
995
825
1,540
1,835
2,210
1,475
1,675
1,510
2,155
1,300
1,075
1,255
955
1,700
1,455
1,135
1,020
1,660
1,105
995
1,420
2,090
1,880
1,340
1,595
1,925
1,175
1,415
940
850
2,315
1,800
1,620
1,155
1,375
1,655
1,290
1,160
830
1,190
1,975
1,535
1,380
985
1,665
1,920
1,370
1,065
960
685
980
2,015
2,320
1,655
2,365
1,430
1,185
1,380
1,045
1,865
1,600
3,140
1,605
1,445
2,060
1,245
1,030
1,925
2,290
2,760
1,840
2,095
1,885
2,695
1,625
1,345
1,570
1,190
2,125
1,820
1,415
1,275
2,075
1,385
1,245
1,780
2,610
2,350
1,680
1,995
2,405
1,465
1,765
1,180
1,060
2,895
2,250
2,025
1,445
1,720
2,070
1,610
1,450
1,035
1,485
2,465
1,920
1,725
1,235
2,085
2,395
1,710
1,330
1,200
855
1,225
2,520
2,900
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
870,000
790,000
1,120,000
660,000
560,000
1,430,000
1,650,000
1,610,000
1,070,000
970,000
1,380,000
810,000
690,000
810,000
600,000
900,000
770,000
1,960,000
1,300,000
1,170,000
1,680,000
980,000
840,000
980,000
720,000
1,090,000
930,000
720,000
650,000
840,000
830,000
550,000
500,000
1,870,000
1,450,000
1,310,000
930,000
1,070,000
1,050,000
700,000
630,000
900,000
1,810,000
1,630,000
1,170,000
1,340,000
1,310,000
1,360,000
1,190,000
850,000
660,000
600,000
430,000
480,000
1,810,000
1,580,000
1,130,000
880,000
790,000
570,000
640,000
1,470,000
1,140,000
1,030,000
730,000
1,515
2,165
1,305
1,080
1,260
955
1,705
1,465
2,870
1,465
1,320
1,885
1,135
940
1,760
2,095
2,525
1,685
1,915
1,725
2,460
1,485
1,230
1,435
1,090
1,940
1,665
1,295
1,165
1,895
1,265
1,140
1,625
2,385
2,150
1,535
1,825
2,200
1,340
1,615
1,075
970
2,645
2,060
1,850
1,325
1,575
1,895
1,475
1,325
945
1,360
2,255
1,755
1,580
1,125
1,905
2,190
1,565
1,220
1,095
785
1,120
2,305
2,650
1,895
2,705
1,630
1,350
1,580
1,195
2,135
1,830
3,590
1,835
1,650
2,355
1,420
1,180
2,200
2,620
3,155
2,105
2,395
2,155
3,075
1,855
1,540
1,795
1,360
2,425
2,080
1,620
1,455
2,370
1,580
1,420
2,030
2,985
2,685
1,920
2,280
2,750
1,675
2,020
1,345
1,210
3,305
2,570
2,315
1,655
1,965
2,370
1,840
1,655
1,185
1,695
2,820
2,190
1,975
1,410
2,380
2,740
1,955
1,520
1,370
980
1,400
2,880
3,315
E
(psi)
1,000,000
900,000
1,280,000
750,000
640,000
1,640,000
1,880,000
1,840,000
1,230,000
1,110,000
1,580,000
930,000
790,000
920,000
680,000
1,020,000
880,000
2,240,000
1,490,000
1,340,000
1,920,000
1,130,000
960,000
1,120,000
830,000
1,240,000
1,070,000
830,000
750,000
970,000
940,000
630,000
570,000
2,130,000
1,660,000
1,490,000
1,070,000
1,230,000
1,200,000
800,000
720,000
1,030,000
2,070,000
1,870,000
1,330,000
1,530,000
1,500,000
1,560,000
1,360,000
970,000
760,000
680,000
490,000
550,000
2,070,000
1,810,000
1,290,000
1,010,000
910,000
650,000
730,000
1,680,000
1,310,000
1,180,000
840,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 6 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,230
1,105
920
790
735
1,300
1,520
1,150
1,760
1,370
1,230
1,025
880
820
1,070
820
820
1,635
1,410
1,170
1,365
1,035
1,845
1,580
1,620
1,460
2,085
1,260
1,040
1,215
920
1,645
1,410
1,095
985
870
690
685
1,405
1,675
1,505
1,255
1,075
785
1,685
1,275
1,515
1,365
1,140
975
910
1,190
910
1,435
1,100
1,055
830
825
1,190
1,045
795
820
1,005
1,310
1,005
960
760
755
1,085
1,650
1,375
1,180
1,100
1,535
1,380
1,150
985
920
1,625
1,900
1,440
2,200
1,710
1,540
1,285
1,100
1,025
1,340
1,025
1,030
2,045
1,760
1,460
1,705
1,290
2,305
1,975
2,025
1,825
2,605
1,570
1,305
1,520
1,155
2,055
1,760
1,370
1,235
1,090
860
855
1,760
2,090
1,880
1,570
1,345
985
2,105
1,595
1,895
1,705
1,420
1,220
1,140
1,485
1,140
1,795
1,375
1,320
1,040
1,035
1,490
1,305
990
1,025
1,255
1,635
1,255
1,200
950
940
1,355
2,065
1,720
1,475
1,375
3-2x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
2-4x10
4-2x10
1-8x10
1-4x12
2-3x10
1-4x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
4-2x12
2-3x10
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
4-2x10
1-8x10
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
2-3x14
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
1-10x12
4-3x12
2-3x14
1-6x14
3-3x14
2-4x14
3-3x12
1-8x12
1-10x12
4-3x12
1-8x10
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
1-10x12
4-3x12
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 30 pounds per square foot within a deflection limitation of L/240. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
880,000
800,000
660,000
570,000
530,000
1,200,000
1,400,000
1,040,000
1,340,000
1,040,000
940,000
780,000
670,000
620,000
800,000
620,000
1,340,000
1,210,000
1,720,000
1,010,000
860,000
1,010,000
740,000
1,120,000
960,000
750,000
670,000
560,000
1,430,000
1,200,000
1,020,000
1,190,000
880,000
1,330,000
1,140,000
580,000
1,640,000
1,210,000
1,210,000
1,090,000
910,000
780,000
730,000
930,000
730,000
680,000
540,000
550,000
1,400,000
1,400,000
1,260,000
1,050,000
900,000
840,000
1,080,000
840,000
790,000
620,000
630,000
770,000
1,450,000
1,210,000
1,040,000
970,000
1,240,000
970,000
910,000
720,000
730,000
890,000
760,000
590,000
600,000
1,435
1,290
1,075
920
860
1,520
1,770
1,345
2,055
1,595
1,440
1,200
1,025
960
1,250
960
960
1,910
1,645
1,365
1,590
1,205
2,150
1,845
1,890
1,700
2,430
1,465
1,215
1,420
1,075
1,920
1,645
1,280
1,150
1,015
800
795
1,640
1,950
1,755
1,465
1,255
915
1,965
1,490
1,770
1,595
1,325
1,140
1,060
1,385
1,060
1,675
1,285
1,230
970
965
1,390
1,215
925
955
1,170
1,530
1,170
1,120
885
880
1,265
1,925
1,605
1,375
1,285
1,790
1,615
1,345
1,150
1,075
1,900
2,215
1,680
2,565
1,995
1,795
1,495
1,285
1,200
1,565
1,200
1,200
2,385
2,055
1,705
1,990
1,510
2,690
2,305
2,365
2,130
3,040
1,835
1,520
1,775
1,345
2,400
2,055
1,600
1,440
1,270
1,005
995
2,050
2,440
2,195
1,830
1,570
1,145
2,455
1,860
2,210
1,990
1,660
1,420
1,325
1,730
1,325
2,095
1,605
1,535
1,215
1,205
1,735
1,520
1,160
1,195
1,465
1,910
1,465
1,400
1,105
1,100
1,585
2,410
2,010
1,720
1,605
E
(psi)
Span = 8'-0" f b
(psi)
10 psf DL 20 psf DL
1,640
1,475
1,230
1,055
985
1,735
2,025
1,535
2,345
1,825
1,645
1,370
1,175
1,095
1,430
1,095
1,095
2,180
1,880
1,560
1,820
1,380
2,460
2,105
2,160
1,945
2,780
1,675
1,390
1,620
1,230
2,190
1,880
1,460
1,315
1,160
915
910
1,875
2,230
2,005
1,675
1,435
1,050
2,245
1,700
2,025
1,820
1,515
1,300
1,215
1,585
1,215
1,915
1,470
1,405
1,110
1,100
1,590
1,390
1,060
1,095
1,340
1,745
1,340
1,280
1,010
1,005
1,445
2,205
1,835
1,575
1,470
2,050
1,845
1,535
1,315
1,230
2,170
2,530
1,920
2,935
2,280
2,055
1,710
1,465
1,370
1,785
1,370
1,370
2,725
2,350
1,945
2,270
1,725
3,070
2,635
2,700
2,430
3,475
2,095
1,735
2,025
1,535
2,740
2,350
1,825
1,645
1,450
1,145
1,140
2,345
2,790
2,510
2,090
1,790
1,310
2,805
2,125
2,530
2,275
1,895
1,625
1,515
1,980
1,515
2,395
1,835
1,755
1,385
1,375
1,985
1,740
1,325
1,365
1,675
2,185
1,675
1,600
1,265
1,255
1,810
2,755
2,295
1,965
1,835
1,030,000
930,000
770,000
660,000
620,000
1,400,000
1,640,000
1,210,000
1,560,000
1,210,000
1,090,000
910,000
780,000
730,000
930,000
730,000
1,560,000
1,410,000
2,010,000
1,180,000
1,010,000
1,170,000
870,000
1,300,000
1,120,000
870,000
780,000
650,000
1,670,000
1,400,000
1,190,000
1,390,000
1,030,000
1,550,000
1,330,000
680,000
1,910,000
1,410,000
1,420,000
1,270,000
1,060,000
910,000
850,000
1,080,000
850,000
800,000
630,000
640,000
1,630,000
1,640,000
1,480,000
1,230,000
1,050,000
980,000
1,260,000
980,000
920,000
730,000
740,000
900,000
1,700,000
1,410,000
1,210,000
1,130,000
1,440,000
1,130,000
1,060,000
840,000
850,000
1,040,000
890,000
690,000
700,000
E
(psi)
1,180,000
1,060,000
880,000
760,000
710,000
1,600,000
1,870,000
1,380,000
1,780,000
1,390,000
1,250,000
1,040,000
890,000
830,000
1,060,000
830,000
1,790,000
1,610,000
2,300,000
1,350,000
1,150,000
1,340,000
990,000
1,490,000
1,280,000
990,000
890,000
750,000
1,910,000
1,600,000
1,360,000
1,590,000
1,180,000
1,770,000
1,520,000
780,000
2,180,000
1,610,000
1,620,000
1,460,000
1,210,000
1,040,000
970,000
1,240,000
970,000
910,000
720,000
730,000
1,870,000
1,870,000
1,690,000
1,400,000
1,200,000
1,120,000
1,430,000
1,120,000
1,050,000
830,000
840,000
1,030,000
1,940,000
1,620,000
1,380,000
1,290,000
1,650,000
1,290,000
1,210,000
960,000
970,000
1,190,000
1,020,000
790,000
800,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
27

28 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 7 Floor and Roof Beams
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,415
855
705
825
625
1,895
1,260
1,135
855
1,220
735
1,150
1,370
1,650
1,100
990
1,625
980
810
725
1,040
1,545
1,390
990
1,180
1,420
950
845
1,020
1,220
1,690
1,315
1,185
845
1,210
1,430
1,645
1,175
915
820
585
840
1,990
1,420
1,105
995
710
1,295
1,115
925
1,075
815
1,455
1,250
970
810
945
720
1,280
1,095
855
770
1,435
875
730
625
1,765
1,065
885
1,030
780
2,365
1,580
1,420
1,065
1,525
920
1,440
1,710
2,060
1,375
1,235
2,030
1,225
1,010
910
1,300
1,930
1,735
1,240
1,475
1,780
1,185
1,055
1,275
1,525
2,115
1,645
1,480
1,055
1,515
1,785
2,055
1,470
1,140
1,025
735
1,050
2,485
1,775
1,380
1,245
890
1,615
1,390
1,155
1,345
1,020
1,820
1,560
1,215
1,015
1,185
900
1,600
1,370
1,065
960
1,795
1,090
910
780
2-3x6
1-3x8
1-4x8
3-2x8
2-3x8
2-4x8
2-2x10
1-3x8
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
2-4x8
1-6x8
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
1-4x8
3-2x8
2-3x8
2-4x8
1-6x8
2-2x10
1-3x10
1-4x8
3-2x8
2-3x8
2-4x8
2-2x10
3-2x10
2-3x10
1-4x10
2-4x10
4-2x10
1-8x10
2-2x10
3-2x10
2-3x10
1-4x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
3-2x10
2-3x10
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
4-2x12
2-4x12
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 30 pounds per square foot within a deflection limitation of L/360. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
810,000
1,160,000
680,000
1,500,000
1,720,000
1,680,000
1,120,000
1,010,000
1,440,000
850,000
720,000
840,000
620,000
2,070,000
1,380,000
1,240,000
1,780,000
1,040,000
1,750,000
1,530,000
1,090,000
850,000
770,000
550,000
610,000
2,040,000
1,450,000
1,130,000
1,020,000
730,000
840,000
820,000
980,000
1,890,000
1,470,000
1,320,000
940,000
1,060,000
710,000
640,000
910,000
1,870,000
1,680,000
1,200,000
1,380,000
1,350,000
900,000
890,000
1,040,000
770,000
1,150,000
990,000
770,000
690,000
1,680,000
1,510,000
1,270,000
1,080,000
1,260,000
930,000
1,400,000
1,200,000
930,000
840,000
700,000
600,000
1,650
995
825
960
730
2,210
1,475
1,325
995
1,420
860
1,340
1,595
1,925
1,285
1,155
1,895
1,140
940
850
1,210
1,800
1,620
1,155
1,375
1,660
1,105
985
1,190
1,425
1,975
1,535
1,380
985
1,415
1,665
1,920
1,370
1,065
960
685
980
2,320
1,655
1,290
1,160
830
1,510
1,300
1,075
1,255
955
1,700
1,455
1,135
945
1,105
840
1,495
1,280
995
895
1,675
1,020
850
730
2,060
1,245
1,030
1,205
910
2,760
1,840
1,655
1,245
1,780
1,070
1,680
1,995
2,405
1,605
1,445
2,365
1,430
1,180
1,060
1,515
2,250
2,025
1,445
1,720
2,075
1,385
1,230
1,485
1,780
2,465
1,920
1,725
1,235
1,765
2,085
2,395
1,710
1,330
1,200
855
1,225
2,900
2,070
1,610
1,450
1,035
1,885
1,625
1,345
1,570
1,190
2,125
1,820
1,415
1,185
1,380
1,045
1,865
1,600
1,245
1,120
2,095
1,275
1,060
910
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
950,000
1,350,000
790,000
1,750,000
2,010,000
1,970,000
1,310,000
1,180,000
1,680,000
990,000
840,000
980,000
730,000
2,420,000
1,610,000
1,450,000
2,070,000
1,220,000
2,040,000
1,790,000
1,280,000
990,000
890,000
640,000
720,000
2,380,000
1,700,000
1,320,000
1,190,000
850,000
980,000
950,000
1,140,000
2,200,000
1,710,000
1,540,000
1,100,000
1,240,000
830,000
740,000
1,060,000
2,180,000
1,960,000
1,400,000
1,610,000
1,570,000
1,050,000
1,040,000
1,210,000
890,000
1,340,000
1,150,000
900,000
810,000
1,960,000
1,760,000
1,480,000
1,260,000
1,470,000
1,080,000
1,630,000
1,400,000
1,090,000
980,000
820,000
700,000
1,885
1,135
940
1,100
835
2,525
1,685
1,515
1,140
1,625
980
1,535
1,825
2,200
1,465
1,320
2,165
1,305
1,075
970
1,385
2,060
1,850
1,325
1,575
1,895
1,265
1,125
1,360
1,630
2,255
1,755
1,580
1,125
1,615
1,905
2,190
1,565
1,220
1,095
785
1,120
2,650
1,895
1,475
1,325
945
1,725
1,485
1,230
1,435
1,090
1,940
1,665
1,295
1,080
1,260
955
1,705
1,465
1,140
1,025
1,915
1,165
970
830
2,355
1,420
1,180
1,375
1,040
3,155
2,105
1,895
1,420
2,030
1,225
1,920
2,280
2,750
1,835
1,650
2,705
1,630
1,345
1,210
1,730
2,570
2,315
1,655
1,965
2,370
1,580
1,410
1,695
2,035
2,820
2,190
1,975
1,410
2,020
2,380
2,740
1,955
1,520
1,370
980
1,400
3,315
2,370
1,840
1,655
1,185
2,155
1,855
1,540
1,795
1,360
2,425
2,080
1,620
1,350
1,580
1,195
2,135
1,830
1,420
1,280
2,395
1,455
1,215
1,040
E
(psi)
1,080,000
1,540,000
910,000
2,000,000
2,300,000
2,250,000
1,500,000
1,350,000
1,930,000
1,130,000
960,000
1,120,000
830,000
2,760,000
1,840,000
1,660,000
2,370,000
1,390,000
2,340,000
2,040,000
1,460,000
1,130,000
1,020,000
730,000
820,000
2,720,000
1,940,000
1,510,000
1,360,000
970,000
1,120,000
1,090,000
1,310,000
2,520,000
1,960,000
1,760,000
1,260,000
1,410,000
940,000
850,000
1,210,000
2,490,000
2,240,000
1,600,000
1,840,000
1,800,000
1,200,000
1,180,000
1,380,000
1,020,000
1,540,000
1,320,000
1,020,000
920,000
2,240,000
2,010,000
1,690,000
1,440,000
1,680,000
1,240,000
1,860,000
1,600,000
1,240,000
1,120,000
930,000
800,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 7 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
960
760
755
1,085
950
725
1,375
1,180
1,100
1,100
1,055
830
825
1,190
1,045
795
820
595
910
1,190
910
870
690
685
985
860
820
785
620
615
1,515
1,365
1,140
975
1,505
1,255
1,075
1,005
1,310
1,005
1,300
1,150
1,370
1,230
1,025
880
820
1,070
1,580
1,230
1,105
920
790
735
960
735
985
820
705
660
1,170
1,365
1,035
1,845
1,460
1,260
1,040
1,215
920
1,645
1,410
1,095
1,200
950
940
1,355
1,190
905
1,720
1,475
1,375
1,375
1,320
1,040
1,035
1,490
1,305
990
1,025
745
1,140
1,485
1,140
1,090
860
855
1,230
1,075
1,025
985
775
770
1,895
1,705
1,420
1,220
1,880
1,570
1,345
1,255
1,635
1,255
1,625
1,440
1,710
1,540
1,285
1,100
1,025
1,340
1,975
1,535
1,380
1,150
985
920
1,205
920
1,235
1,030
880
820
1,460
1,705
1,290
2,305
1,825
1,570
1,305
1,520
1,155
2,055
1,760
1,370
2-3x10
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
2-4x10
1-8x10
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-6x10
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
2-4x10
4-2x10
1-8x10
2-2x12
1-4x12
1-8x12
1-10x12
4-3x12
3-2x12
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
1-10x12
4-3x12
2-3x14
1-6x14
2-3x12
4-2x12
2-4x12
5-2x12
1-6x12
3-3x12
1-8x12
1-10x12
4-3x12
2-3x14
1-6x14
3-3x14
4-2x12
2-4x12
5-2x12
3-3x12
1-8x12
1-10x12
4-3x12
2-3x14
1-6x14
3-3x14
2-4x14
4-3x14
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 30 pounds per square foot within a deflection limitation of L/360. For instructions on use of table see Design Data For Beams on page 4.
E
(psi) 10 psf DL
Span = 7'-0" f b
(psi)
20 psf DL
940,000
880,000
690,000
700,000
1,820,000
1,640,000
1,370,000
1,170,000
1,090,000
1,390,000
1,090,000
1,020,000
810,000
820,000
1,000,000
860,000
1,900,000
1,580,000
1,350,000
1,260,000
1,610,000
1,260,000
1,710,000
1,330,000
1,190,000
1,000,000
850,000
800,000
1,020,000
800,000
1,800,000
1,560,000
1,560,000
1,400,000
1,170,000
1,000,000
940,000
1,200,000
1,810,000
1,520,000
1,290,000
1,510,000
1,110,000
1,680,000
1,440,000
1,120,000
1,010,000
840,000
720,000
670,000
1,530,000
1,790,000
1,320,000
1,990,000
1,180,000
930,000
950,000
1,160,000
1,000,000
770,000
1,820,000
1,560,000
1,450,000
1,450,000
1,360,000
1,070,000
1,090,000
1,330,000
1,150,000
890,000
901,360
667,345
1,120
885
880
1,265
1,110
845
1,605
1,375
1,285
1,285
1,230
970
965
1,390
1,215
925
955
695
1,060
1,385
1,060
1,015
800
795
1,150
1,005
960
915
725
720
1,770
1,595
1,325
1,140
1,755
1,465
1,255
1,170
1,530
1,170
1,520
1,345
1,595
1,440
1,200
1,025
960
1,250
1,845
1,435
1,290
1,075
920
860
1,125
860
1,150
960
820
765
1,365
1,590
1,205
2,150
1,700
1,465
1,215
1,420
1,075
1,920
1,645
1,280
1,400
1,105
1,100
1,585
1,385
1,055
2,010
1,720
1,605
1,605
1,535
1,215
1,205
1,735
1,520
1,160
1,195
870
1,325
1,730
1,325
1,270
1,005
995
1,435
1,255
1,200
1,145
905
900
2,210
1,990
1,660
1,420
2,195
1,830
1,570
1,465
1,910
1,465
1,900
1,680
1,995
1,795
1,495
1,285
1,200
1,565
2,305
1,790
1,615
1,345
1,150
1,075
1,405
1,075
1,440
1,200
1,030
960
1,705
1,990
1,510
2,690
2,130
1,835
1,520
1,775
1,345
2,400
2,055
1,600
E
(psi) 10 psf DL
Span = 8'-0" f b
(psi)
20 psf DL
1,090,000
1,020,000
810,000
820,000
2,120,000
1,910,000
1,590,000
1,370,000
1,270,000
1,630,000
1,270,000
1,190,000
940,000
960,000
1,170,000
1,010,000
2,210,000
1,840,000
1,580,000
1,480,000
1,880,000
1,480,000
1,990,000
1,550,000
1,390,000
1,160,000
1,000,000
930,000
1,190,000
930,000
2,110,000
1,810,000
1,820,000
1,640,000
1,370,000
1,170,000
1,090,000
1,390,000
2,110,000
1,770,000
1,510,000
1,760,000
1,300,000
1,960,000
1,680,000
1,300,000
1,170,000
980,000
840,000
780,000
1,790,000
2,090,000
1,540,000
2,320,000
1,380,000
1,090,000
1,110,000
1,350,000
1,160,000
900,000
2,120,000
1,820,000
1,700,000
1,700,000
1,590,000
1,250,000
1,270,000
1,560,000
1,340,000
1,040,000
1,050,000
780,000
1,280
1,010
1,005
1,445
1,265
965
1,835
1,575
1,470
1,470
1,405
1,110
1,100
1,590
1,390
1,060
1,095
795
1,215
1,585
1,215
1,160
915
910
1,310
1,150
1,095
1,050
830
820
2,025
1,820
1,515
1,300
2,005
1,675
1,435
1,340
1,745
1,340
1,735
1,535
1,825
1,645
1,370
1,175
1,095
1,430
2,105
1,640
1,475
1,230
1,055
985
1,285
985
1,315
1,095
940
875
1,560
1,820
1,380
2,460
1,945
1,675
1,390
1,620
1,230
2,190
1,880
1,460
1,600
1,265
1,255
1,810
1,585
1,205
2,295
1,965
1,835
1,835
1,755
1,385
1,375
1,985
1,740
1,325
1,365
990
1,515
1,980
1,515
1,450
1,145
1,140
1,640
1,435
1,370
1,310
1,035
1,025
2,530
2,275
1,895
1,625
2,510
2,090
1,790
1,675
2,185
1,675
2,170
1,920
2,280
2,055
1,710
1,465
1,370
1,785
2,635
2,050
1,845
1,535
1,315
1,230
1,605
1,230
1,645
1,370
1,175
1,095
1,945
2,270
1,725
3,070
2,430
2,095
1,735
2,025
1,535
2,740
2,350
1,825
E
(psi)
1,250,000
1,170,000
920,000
940,000
2,430,000
2,180,000
1,820,000
1,560,000
1,460,000
1,860,000
1,460,000
1,360,000
1,080,000
1,090,000
1,340,000
1,150,000
2,530,000
2,110,000
1,810,000
1,690,000
2,150,000
1,690,000
2,270,000
1,770,000
1,590,000
1,330,000
1,140,000
1,060,000
1,360,000
1,060,000
2,410,000
2,070,000
2,080,000
1,870,000
1,560,000
1,340,000
1,250,000
1,590,000
2,410,000
2,030,000
1,720,000
2,010,000
1,490,000
2,240,000
1,920,000
1,490,000
1,340,000
1,120,000
960,000
890,000
2,050,000
2,390,000
1,760,000
2,650,000
1,580,000
1,250,000
1,260,000
1,550,000
1,330,000
1,030,000
2,420,000
2,080,000
1,940,000
1,940,000
1,810,000
1,430,000
1,450,000
1,780,000
1,530,000
1,190,000
1,200,000
890,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
29

30 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 8 Floor and Roof Beams
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
1-6x10
1-8x10
4-2x10
2-2x12
3-2x12
1-3x12
4-2x12
2-3x12
3-2x10
2-3x10
2-4x10
3-3x10
1-6x10
1-8x10
4-2x10
2-2x12
3-2x12
4-2x12
5-2x12
2-3x12
3-3x10
1-6x10
1-8x10
4-2x10
2-2x12
3-2x10
2-3x10
2-4x10
3-3x10
1-3x10
2-3x10
1-4x10
2-4x10
2-4x8
3-2x10
2-3x10
1-4x10
2-4x10
1-3x10
1-4x10
3-2x10
1-4x8
1-6x8
3-2x8
2-2x10
1-3x10
1-4x10
3-2x10
2-3x10
1-6x8
2-3x8
2-4x8
2-2x10
3-2x10
2-3x6
1-3x8
2-2x8
1-4x8
1-6x8
2-2x10
1-3x10
2-2x8
1-4x8
1-6x8
2-2x10
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,920
800
960
1,795
1,615
1,155
1,075
1,390
1,020
1,345
1,820
1,215
910
730
1,090
1,420
1,015
945
1,225
900
1,185
1,600
1,065
1,765
885
825
1,065
780
1,030
1,395
1,580
1,780
1,185
2,135
1,065
1,525
760
1,440
1,375
1,235
1,645
1,515
1,820
1,300
1,010
910
1,475
1,735
1,240
1,775
1,055
1,275
1,525
1,090
850
2,115
1,255
1,785
2,055
1,710
1,470
875
1,050
1,260
2,070
2,305
960
1,150
2,155
1,940
1,385
1,295
1,670
1,225
1,615
2,185
1,455
1,090
875
1,310
1,705
1,215
1,135
1,470
1,075
1,420
1,920
1,280
2,120
1,060
990
1,280
940
1,235
1,675
1,895
2,135
1,420
2,560
1,280
1,830
915
1,725
1,650
1,485
1,975
1,820
2,180
1,560
1,210
1,090
1,770
2,085
1,490
2,130
1,265
1,525
1,835
1,310
1,020
2,535
1,510
2,140
2,465
2,055
1,760
1,045
1,260
1,515
2,485
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 40 pounds per square foot within a deflection limitation of L/180. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
920,000
380,000
460,000
1,120,000
1,010,000
720,000
670,000
840,000
620,000
840,000
930,000
620,000
470,000
370,000
560,000
960,000
480,000
450,000
570,000
410,000
560,000
620,000
920,000
830,000
590,000
550,000
700,000
510,000
690,000
770,000
510,000
980,000
710,000
850,000
610,000
470,000
420,000
920,000
1,120,000
800,000
900,000
600,000
1,080,000
540,000
770,000
390,000
1,000,000
750,000
670,000
1,170,000
1,020,000
850,000
730,000
420,000
410,000
490,000
1,130,000
970,000
560,000
540,000
650,000
470,000
360,000
1,260,000
720,000
2,240
935
1,120
2,095
1,885
1,345
1,255
1,625
1,190
1,570
2,125
1,415
1,060
850
1,275
1,655
1,185
1,105
1,430
1,045
1,380
1,865
1,245
2,060
1,030
960
1,245
910
1,205
1,625
1,840
2,075
1,385
2,490
1,245
1,780
890
1,680
1,605
1,445
1,920
1,765
2,120
1,515
1,180
1,060
1,720
2,025
1,445
2,070
1,230
1,485
1,780
1,275
990
2,465
1,465
2,085
2,395
2,000
1,710
1,020
1,225
1,475
2,415
2,690
1,120
1,345
2,515
2,260
1,615
1,510
1,950
1,430
1,885
2,550
1,700
1,275
1,020
1,530
1,990
1,420
1,325
1,715
1,255
1,655
2,240
1,495
2,475
1,235
1,155
1,495
1,095
1,445
1,950
2,210
2,490
1,660
2,985
1,495
2,135
1,065
2,015
1,925
1,730
2,300
2,120
2,545
1,820
1,415
1,270
2,065
2,430
1,735
2,485
1,480
1,780
2,140
1,525
1,190
2,960
1,760
2,500
2,875
2,395
2,055
1,220
1,475
1,765
2,900
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
1,080,000
450,000
540,000
1,300,000
1,170,000
840,000
780,000
980,000
720,000
980,000
1,090,000
720,000
540,000
430,000
650,000
1,120,000
560,000
520,000
660,000
480,000
660,000
730,000
1,070,000
970,000
690,000
640,000
810,000
600,000
810,000
900,000
600,000
1,140,000
830,000
990,000
710,000
550,000
500,000
1,070,000
1,310,000
930,000
1,050,000
700,000
1,260,000
630,000
900,000
450,000
1,170,000
870,000
790,000
1,360,000
1,190,000
990,000
850,000
490,000
480,000
570,000
1,320,000
1,130,000
650,000
640,000
760,000
540,000
420,000
1,470,000
840,000
2,560
1,065
1,280
2,395
2,155
1,540
1,435
1,855
1,360
1,795
2,425
1,620
1,215
970
1,455
1,895
1,350
1,260
1,630
1,195
1,580
2,135
1,420
2,355
1,180
1,100
1,420
1,040
1,375
1,860
2,105
2,370
1,580
2,845
1,420
2,030
1,015
1,920
1,835
1,650
2,190
2,020
2,425
1,730
1,345
1,210
1,965
2,315
1,655
2,370
1,410
1,695
2,035
1,455
1,130
2,820
1,675
2,380
2,740
2,285
1,955
1,165
1,400
1,685
2,760
3,070
1,280
1,535
2,870
2,585
1,845
1,725
2,230
1,635
2,155
2,915
1,940
1,455
1,165
1,750
2,270
1,625
1,515
1,960
1,435
1,895
2,560
1,705
2,825
1,415
1,320
1,705
1,250
1,650
2,230
2,525
2,845
1,895
3,415
1,705
2,440
1,220
2,300
2,200
1,980
2,630
2,425
2,910
2,075
1,615
1,455
2,360
2,780
1,985
2,840
1,690
2,035
2,445
1,745
1,360
3,380
2,010
2,855
3,290
2,740
2,350
1,395
1,685
2,020
3,315
E
(psi)
1,230,000
510,000
610,000
1,490,000
1,340,000
960,000
890,000
1,130,000
830,000
1,120,000
1,240,000
830,000
620,000
500,000
750,000
1,280,000
640,000
600,000
750,000
550,000
750,000
830,000
1,230,000
1,110,000
790,000
740,000
930,000
680,000
920,000
1,020,000
680,000
1,310,000
940,000
1,130,000
810,000
630,000
570,000
1,230,000
1,490,000
1,070,000
1,200,000
800,000
1,440,000
720,000
1,030,000
510,000
1,330,000
1,000,000
900,000
1,560,000
1,360,000
1,130,000
970,000
560,000
550,000
650,000
1,510,000
1,290,000
740,000
730,000
870,000
620,000
480,000
1,680,000
970,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 8 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
820
880
1,075
785
2,045
1,460
1,365
1,290
1,825
1,305
1,215
1,155
1,370
1,030
820
1,235
1,535
1,150
920
1,380
920
985
1,140
1,140
1,220
1,485
1,090
815
855
740
860
1,230
2,090
1,570
1,255
1,255
1,100
1,340
985
735
770
670
1,895
1,420
1,205
880
1,440
1,710
1,285
1,025
1,540
1,025
1,345
1,200
895
985
1,035
900
1,040
1,490
1,305
1,025
990
710
940
820
950
1,355
1,190
1,720
1,375
1,375
985
1,055
1,285
945
2,455
1,755
1,635
1,550
2,190
1,565
1,460
1,385
1,645
1,235
985
1,480
1,845
1,380
1,105
1,660
1,105
1,185
1,365
1,365
1,465
1,780
1,305
975
1,025
890
1,030
1,475
2,510
1,880
1,505
1,505
1,320
1,610
1,180
880
925
805
2,275
1,705
1,445
1,060
1,730
2,055
1,540
1,230
1,850
1,230
1,615
1,440
1,075
1,180
1,240
1,080
1,250
1,785
1,565
1,230
1,190
850
1,130
980
1,135
1,630
1,425
2,065
1,650
1,650
2-4x12
1-6x12
1-8x12
3-4x12
4-3x12
2-6x12
3-2x12
4-2x12
5-2x12
3-3x12
2-4x12
1-6x12
1-8x12
3-4x12
3-3x10
1-8x10
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
2-4x12
1-6x12
1-8x12
1-8x10
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
4-3x12
2-6x12
1-10x12
2-3x14
3-2x12
4-2x12
5-2x12
3-3x12
2-4x12
1-8x12
3-4x12
4-3x12
2-6x12
1-10x12
2-3x14
1-6x14
4-2x12
5-2x12
3-3x12
3-4x12
4-3x12
2-6x12
1-10x12
2-3x14
1-6x14
2-4x14
3-3x14
3-4x14
2-3x10
2-4x10
3-3x10
1-8x10
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
2-4x12
1-6x12
1-8x12
2-3x10
2-4x10
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 40 pounds per square foot within a deflection limitation of L/180. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
1,210,000
860,000
800,000
740,000
750,000
560,000
450,000
670,000
450,000
480,000
570,000
420,000
1,430,000
1,020,000
950,000
880,000
880,000
660,000
530,000
800,000
530,000
570,000
730,000
730,000
780,000
930,000
680,000
520,000
550,000
460,000
540,000
670,000
1,400,000
1,050,000
840,000
840,000
680,000
500,000
1,040,000
1,040,000
780,000
620,000
940,000
620,000
670,000
800,000
580,000
450,000
470,000
400,000
1,210,000
910,000
900,000
790,000
600,000
630,000
540,000
620,000
770,000
670,000
1,210,000
970,000
970,000
690,000
730,000
620,000
720,000
890,000
760,000
600,000
590,000
420,000
960
1,030
1,250
920
2,385
1,705
1,590
1,510
2,130
1,520
1,420
1,345
1,600
1,200
960
1,440
1,790
1,345
1,075
1,615
1,075
1,150
1,325
1,325
1,420
1,730
1,270
950
995
865
1,005
1,435
2,440
1,830
1,465
1,465
1,285
1,565
1,145
855
900
780
2,210
1,660
1,405
1,030
1,680
1,995
1,495
1,200
1,795
1,200
1,570
1,400
1,045
1,145
1,205
1,050
1,215
1,735
1,520
1,195
1,160
825
1,100
955
1,105
1,585
1,385
2,010
1,605
1,605
1,150
1,235
1,500
1,100
2,865
2,045
1,910
1,810
2,555
1,825
1,700
1,615
1,920
1,440
1,150
1,725
2,150
1,615
1,290
1,935
1,290
1,380
1,595
1,595
1,705
2,080
1,525
1,140
1,195
1,040
1,205
1,720
2,925
2,195
1,755
1,755
1,540
1,875
1,375
1,025
1,080
940
2,655
1,990
1,685
1,235
2,015
2,395
1,795
1,440
2,155
1,440
1,880
1,680
1,255
1,375
1,445
1,260
1,455
2,085
1,825
1,435
1,390
990
1,315
1,145
1,325
1,900
1,665
2,410
1,925
1,925
E
(psi)
1,610,000
1,150,000
1,070,000
990,000
990,000
750,000
600,000
890,000
600,000
640,000
760,000
560,000
1,910,000
1,360,000
1,270,000
1,180,000
1,180,000
880,000
710,000
1,060,000
710,000
760,000
970,000
970,000
1,040,000
1,240,000
910,000
690,000
730,000
620,000
720,000
890,000
1,870,000
1,400,000
1,120,000
1,120,000
900,000
660,000
1,380,000
1,390,000
1,040,000
830,000
1,250,000
830,000
890,000
1,060,000
780,000
590,000
620,000
530,000
1,620,000
1,210,000
1,200,000
1,050,000
800,000
840,000
720,000
830,000
1,030,000
890,000
1,620,000
1,290,000
1,290,000
920,000
970,000
820,000
960,000
1,190,000
1,020,000
800,000
790,000
560,000
E
(psi)
Span = 8'-0" f b
(psi)
10 psf DL 20 psf DL
1,095
1,175
1,430
1,050
2,725
1,945
1,820
1,725
2,430
1,735
1,620
1,535
1,825
1,370
1,095
1,645
2,050
1,535
1,230
1,845
1,230
1,315
1,515
1,515
1,625
1,980
1,450
1,085
1,140
990
1,145
1,640
2,790
2,090
1,675
1,675
1,465
1,785
1,310
980
1,025
895
2,530
1,895
1,605
1,175
1,920
2,280
1,710
1,370
2,055
1,370
1,790
1,600
1,195
1,310
1,375
1,200
1,385
1,985
1,740
1,365
1,325
945
1,255
1,090
1,265
1,810
1,585
2,295
1,835
1,835
1,315
1,410
1,715
1,260
3,270
2,335
2,180
2,070
2,920
2,085
1,945
1,845
2,190
1,645
1,315
1,975
2,460
1,845
1,475
2,210
1,475
1,580
1,820
1,820
1,950
2,375
1,740
1,300
1,365
1,190
1,375
1,970
3,345
2,510
2,005
2,005
1,760
2,145
1,570
1,175
1,230
1,070
3,035
2,275
1,925
1,410
2,305
2,740
2,055
1,645
2,465
1,645
2,150
1,920
1,435
1,575
1,650
1,435
1,665
2,380
2,085
1,640
1,590
1,135
1,505
1,310
1,515
2,170
1,900
2,755
2,205
2,205
1,410,000
1,010,000
940,000
870,000
870,000
650,000
520,000
780,000
520,000
560,000
670,000
490,000
1,670,000
1,190,000
1,110,000
1,030,000
1,030,000
770,000
620,000
930,000
620,000
660,000
850,000
850,000
910,000
1,080,000
800,000
610,000
640,000
540,000
630,000
780,000
1,640,000
1,230,000
980,000
980,000
790,000
580,000
1,210,000
1,210,000
910,000
730,000
1,090,000
730,000
780,000
930,000
680,000
520,000
550,000
460,000
1,420,000
1,060,000
1,050,000
920,000
700,000
740,000
630,000
730,000
900,000
780,000
1,410,000
1,130,000
1,130,000
810,000
850,000
720,000
840,000
1,040,000
890,000
700,000
690,000
490,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
31

32 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 9 Floor and Roof Beams
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,155
1,075
1,390
1,020
1,345
1,820
1,215
910
730
1,090
1,185
1,600
1,065
1,920
800
960
1,795
1,615
780
1,030
1,395
1,580
1,420
1,015
945
1,225
900
760
1,440
1,375
1,235
1,765
885
825
1,065
1,475
1,735
1,240
1,780
1,185
2,135
1,065
1,525
850
2,115
1,255
1,645
1,515
1,820
1,300
1,010
910
1,785
2,055
1,710
1,470
875
1,050
1,260
2,070
1,775
1,055
1,275
1,525
1,090
1,385
1,295
1,670
1,225
1,615
2,185
1,455
1,090
875
1,310
1,420
1,920
1,280
2,305
960
1,150
2,155
1,940
940
1,235
1,675
1,895
1,705
1,215
1,135
1,470
1,075
915
1,725
1,650
1,485
2,120
1,060
990
1,280
1,770
2,085
1,490
2,135
1,420
2,560
1,280
1,830
1,020
2,535
1,510
1,975
1,820
2,180
1,560
1,210
1,090
2,140
2,465
2,055
1,760
1,045
1,260
1,515
2,485
2,130
1,265
1,525
1,835
1,310
1-6x10
1-8x10
4-2x10
2-2x12
3-2x12
1-3x12
4-2x12
2-3x12
3-2x10
2-3x10
2-4x10
3-3x10
1-6x10
1-8x10
4-2x10
2-2x12
3-2x12
4-2x12
5-2x12
2-3x12
1-4x10
2-4x10
2-4x8
3-2x10
2-3x10
1-4x10
2-4x10
3-3x10
1-6x10
1-8x10
4-2x10
2-2x12
3-2x10
2-3x10
2-4x10
3-3x10
1-4x10
3-2x10
1-4x8
1-6x8
3-2x8
2-2x10
1-3x10
1-4x10
3-2x10
2-3x10
1-6x8
2-3x8
2-4x8
2-2x10
3-2x10
1-3x10
2-3x10
2-3x6
1-3x8
2-2x8
1-4x8
1-6x8
2-2x10
1-3x10
2-2x8
1-4x8
1-6x8
2-2x10
1-3x10
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 40 pounds per square foot within a deflection limitation of L/240. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
920,000
1,020,000
680,000
1,230,000
510,000
610,000
1,490,000
1,340,000
960,000
890,000
1,130,000
830,000
1,120,000
1,240,000
830,000
620,000
500,000
750,000
510,000
1,330,000
1,000,000
900,000
1,280,000
640,000
600,000
750,000
550,000
750,000
830,000
1,230,000
1,110,000
790,000
740,000
930,000
680,000
480,000
1,680,000
970,000
1,310,000
940,000
1,130,000
810,000
630,000
570,000
1,230,000
1,490,000
1,070,000
1,200,000
800,000
1,440,000
720,000
1,030,000
1,560,000
1,360,000
1,130,000
970,000
560,000
550,000
650,000
1,510,000
1,290,000
740,000
730,000
870,000
620,000
1,345
1,255
1,625
1,190
1,570
2,125
1,415
1,060
850
1,275
1,380
1,865
1,245
2,240
935
1,120
2,095
1,885
910
1,205
1,625
1,840
1,655
1,185
1,105
1,430
1,045
890
1,680
1,605
1,445
2,060
1,030
960
1,245
1,720
2,025
1,445
2,075
1,385
2,490
1,245
1,780
990
2,465
1,465
1,920
1,765
2,120
1,515
1,180
1,060
2,085
2,395
2,000
1,710
1,020
1,225
1,475
2,415
2,070
1,230
1,485
1,780
1,275
1,615
1,510
1,950
1,430
1,885
2,550
1,700
1,275
1,020
1,530
1,655
2,240
1,495
2,690
1,120
1,345
2,515
2,260
1,095
1,445
1,950
2,210
1,990
1,420
1,325
1,715
1,255
1,065
2,015
1,925
1,730
2,475
1,235
1,155
1,495
2,065
2,430
1,735
2,490
1,660
2,985
1,495
2,135
1,190
2,960
1,760
2,300
2,120
2,545
1,820
1,415
1,270
2,500
2,875
2,395
2,055
1,220
1,475
1,765
2,900
2,485
1,480
1,780
2,140
1,525
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
1,070,000
1,190,000
800,000
1,430,000
600,000
720,000
1,740,000
1,560,000
1,120,000
1,040,000
1,310,000
960,000
1,300,000
1,450,000
970,000
720,000
580,000
870,000
600,000
1,560,000
1,160,000
1,050,000
1,500,000
750,000
700,000
880,000
650,000
870,000
970,000
1,430,000
1,290,000
920,000
860,000
1,080,000
790,000
570,000
1,960,000
1,130,000
1,520,000
1,100,000
1,320,000
940,000
730,000
660,000
1,430,000
1,740,000
1,250,000
1,400,000
930,000
1,680,000
840,000
1,200,000
1,820,000
1,590,000
1,320,000
1,130,000
650,000
640,000
760,000
1,760,000
1,510,000
870,000
850,000
1,020,000
730,000
1,540
1,435
1,855
1,360
1,795
2,425
1,620
1,215
970
1,455
1,580
2,135
1,420
2,560
1,065
1,280
2,395
2,155
1,040
1,375
1,860
2,105
1,895
1,350
1,260
1,630
1,195
1,015
1,920
1,835
1,650
2,355
1,180
1,100
1,420
1,965
2,315
1,655
2,370
1,580
2,845
1,420
2,030
1,130
2,820
1,675
2,190
2,020
2,425
1,730
1,345
1,210
2,380
2,740
2,285
1,955
1,165
1,400
1,685
2,760
2,370
1,410
1,695
2,035
1,455
1,845
1,725
2,230
1,635
2,155
2,915
1,940
1,455
1,165
1,750
1,895
2,560
1,705
3,070
1,280
1,535
2,870
2,585
1,250
1,650
2,230
2,525
2,270
1,625
1,515
1,960
1,435
1,220
2,300
2,200
1,980
2,825
1,415
1,320
1,705
2,360
2,780
1,985
2,845
1,895
3,415
1,705
2,440
1,360
3,380
2,010
2,630
2,425
2,910
2,075
1,615
1,455
2,855
3,290
2,740
2,350
1,395
1,685
2,020
3,315
2,840
1,690
2,035
2,445
1,745
E
(psi)
1,230,000
1,370,000
910,000
1,640,000
680,000
820,000
1,990,000
1,790,000
1,280,000
1,190,000
1,500,000
1,100,000
1,490,000
1,660,000
1,100,000
830,000
660,000
990,000
690,000
1,780,000
1,330,000
1,200,000
1,710,000
860,000
800,000
1,010,000
740,000
1,000,000
1,110,000
1,640,000
1,470,000
1,050,000
980,000
1,240,000
910,000
650,000
2,240,000
1,290,000
1,740,000
1,260,000
1,510,000
1,080,000
840,000
750,000
1,640,000
1,990,000
1,420,000
1,600,000
1,070,000
1,920,000
960,000
1,370,000
2,080,000
1,810,000
1,510,000
1,300,000
740,000
730,000
870,000
2,010,000
1,720,000
990,000
970,000
1,160,000
830,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 9 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,355
1,190
1,720
1,375
1,375
985
1,035
900
1,040
1,490
1,305
1,025
990
710
855
740
860
1,230
2,090
1,570
1,255
1,255
1,345
1,200
895
940
820
950
1,895
1,420
1,140
1,140
1,220
1,485
1,090
815
1,540
1,025
1,100
1,340
985
735
770
670
820
880
1,075
785
2,045
1,460
1,365
1,290
1,825
1,305
1,215
1,155
1,370
1,030
820
1,235
1,535
1,150
920
1,380
920
985
1,205
880
1,440
1,710
1,285
1,025
1,630
1,425
2,065
1,650
1,650
1,180
1,240
1,080
1,250
1,785
1,565
1,230
1,190
850
1,025
890
1,030
1,475
2,510
1,880
1,505
1,505
1,615
1,440
1,075
1,130
980
1,135
2,275
1,705
1,365
1,365
1,465
1,780
1,305
975
1,850
1,230
1,320
1,610
1,180
880
925
805
985
1,055
1,285
945
2,455
1,755
1,635
1,550
2,190
1,565
1,460
1,385
1,645
1,235
985
1,480
1,845
1,380
1,105
1,660
1,105
1,185
1,445
1,060
1,730
2,055
1,540
1,230
2-3x10
2-4x10
3-3x10
1-8x10
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
2-4x12
1-6x12
1-8x12
2-3x10
2-4x10
3-3x10
1-8x10
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
4-2x12
5-2x12
3-3x12
2-4x12
1-6x12
1-8x12
3-4x12
4-3x12
2-6x12
1-10x12
2-3x14
3-2x12
4-2x12
2-4x12
1-6x12
1-8x12
1-8x10
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
2-4x12
1-6x12
1-8x12
3-4x12
4-3x12
2-6x12
3-2x12
5-2x12
3-3x12
2-4x12
1-8x12
3-4x12
4-3x12
2-6x12
1-10x12
2-3x14
1-6x14
4-2x12
5-2x12
3-3x12
3-4x12
4-3x12
2-6x12
1-10x12
2-3x14
1-6x14
2-4x14
3-3x14
3-4x14
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 40 pounds per square foot within a deflection limitation of L/240. For instructions on use of table see Design Data For Beams on page 4.
E
(psi) 10 psf DL
Span = 7'-0" f b
(psi)
20 psf DL
1,030,000
890,000
1,620,000
1,290,000
1,290,000
920,000
970,000
820,000
960,000
1,190,000
1,020,000
800,000
790,000
560,000
730,000
620,000
720,000
890,000
1,870,000
1,400,000
1,120,000
1,120,000
1,200,000
1,050,000
800,000
840,000
720,000
830,000
1,250,000
830,000
890,000
1,060,000
780,000
590,000
620,000
530,000
1,620,000
1,210,000
970,000
970,000
1,040,000
1,240,000
910,000
690,000
1,610,000
1,150,000
1,070,000
990,000
990,000
750,000
600,000
890,000
600,000
640,000
760,000
560,000
1,910,000
1,360,000
1,270,000
1,180,000
1,180,000
880,000
710,000
1,060,000
710,000
760,000
900,000
660,000
1,380,000
1,390,000
1,040,000
830,000
1,585
1,385
2,010
1,605
1,605
1,145
1,205
1,050
1,215
1,735
1,520
1,195
1,160
825
995
865
1,005
1,435
2,440
1,830
1,465
1,465
1,570
1,400
1,045
1,100
955
1,105
2,210
1,660
1,325
1,325
1,420
1,730
1,270
950
1,795
1,200
1,285
1,565
1,145
855
900
780
960
1,030
1,250
920
2,385
1,705
1,590
1,510
2,130
1,520
1,420
1,345
1,600
1,200
960
1,440
1,790
1,345
1,075
1,615
1,075
1,150
1,405
1,030
1,680
1,995
1,495
1,200
1,900
1,665
2,410
1,925
1,925
1,375
1,445
1,260
1,455
2,085
1,825
1,435
1,390
990
1,195
1,040
1,205
1,720
2,925
2,195
1,755
1,755
1,880
1,680
1,255
1,315
1,145
1,325
2,655
1,990
1,595
1,595
1,705
2,080
1,525
1,140
2,155
1,440
1,540
1,875
1,375
1,025
1,080
940
1,150
1,235
1,500
1,100
2,865
2,045
1,910
1,810
2,555
1,825
1,700
1,615
1,920
1,440
1,150
1,725
2,150
1,615
1,290
1,935
1,290
1,380
1,685
1,235
2,015
2,395
1,795
1,440
1,380,000
1,180,000
2,150,000
1,720,000
1,720,000
1,230,000
1,290,000
1,100,000
1,270,000
1,580,000
1,360,000
1,070,000
1,050,000
750,000
970,000
830,000
960,000
1,190,000
2,500,000
1,870,000
1,500,000
1,500,000
1,610,000
1,400,000
1,070,000
1,120,000
960,000
1,110,000
1,660,000
1,110,000
1,190,000
1,420,000
1,040,000
790,000
830,000
710,000
2,160,000
1,620,000
1,290,000
1,290,000
1,390,000
1,650,000
1,210,000
920,000
2,150,000
1,530,000
1,430,000
1,320,000
1,320,000
990,000
790,000
1,190,000
790,000
850,000
1,010,000
740,000
2,550,000
1,820,000
1,700,000
1,570,000
1,570,000
1,180,000
940,000
1,420,000
940,000
1,010,000
1,200,000
880,000
1,840,000
1,850,000
1,390,000
1,110,000
E
(psi) 10 psf DL
Span = 8'-0" f b
(psi)
20 psf DL
1,200,000
1,030,000
1,880,000
1,510,000
1,510,000
1,080,000
1,130,000
960,000
1,110,000
1,380,000
1,190,000
930,000
920,000
660,000
850,000
720,000
840,000
1,040,000
2,190,000
1,640,000
1,310,000
1,310,000
1,400,000
1,230,000
940,000
980,000
840,000
970,000
1,460,000
970,000
1,040,000
1,240,000
910,000
690,000
730,000
620,000
1,890,000
1,420,000
1,130,000
1,130,000
1,210,000
1,450,000
1,060,000
810,000
1,880,000
1,340,000
1,250,000
1,160,000
1,160,000
870,000
700,000
1,040,000
700,000
750,000
890,000
650,000
2,230,000
1,590,000
1,490,000
1,370,000
1,380,000
1,030,000
830,000
1,240,000
830,000
880,000
1,050,000
770,000
1,610,000
1,620,000
1,210,000
970,000
1,810
1,585
2,295
1,835
1,835
1,310
1,375
1,200
1,385
1,985
1,740
1,365
1,325
945
1,140
990
1,145
1,640
2,790
2,090
1,675
1,675
1,790
1,600
1,195
1,255
1,090
1,265
2,530
1,895
1,515
1,515
1,625
1,980
1,450
1,085
2,055
1,370
1,465
1,785
1,310
980
1,025
895
1,095
1,175
1,430
1,050
2,725
1,945
1,820
1,725
2,430
1,735
1,620
1,535
1,825
1,370
1,095
1,645
2,050
1,535
1,230
1,845
1,230
1,315
1,605
1,175
1,920
2,280
1,710
1,370
2,170
1,900
2,755
2,205
2,205
1,575
1,650
1,435
1,665
2,380
2,085
1,640
1,590
1,135
1,365
1,190
1,375
1,970
3,345
2,510
2,005
2,005
2,150
1,920
1,435
1,505
1,310
1,515
3,035
2,275
1,820
1,820
1,950
2,375
1,740
1,300
2,465
1,645
1,760
2,145
1,570
1,175
1,230
1,070
1,315
1,410
1,715
1,260
3,270
2,335
2,180
2,070
2,920
2,085
1,945
1,845
2,190
1,645
1,315
1,975
2,460
1,845
1,475
2,210
1,475
1,580
1,925
1,410
2,305
2,740
2,055
1,645
E
(psi)
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
33

34 PLANK-AND-BEAM FRAMING FOR RESIDENTIAL BUILDINGS
Table 10 Floor and Roof Beams
1-3x8
2-2x8
1-4x8
1-6x8
2-2x10
1-3x10
1-4x10
1-4x8
1-6x8
2-2x10
1-3x10
1-4x10
3-2x10
2-3x10
1-6x8
3-2x8
2-2x10
1-3x10
1-4x10
2-3x10
3-2x10
1-6x10
2-4x10
3-2x12
3-2x10
2-3x10
2-4x10
3-3x10
1-6x10
1-8x10
4-2x10
2-2x12
3-2x12
1-3x12
4-2x12
2-3x12
2-3x10
2-4x10
3-3x10
1-6x10
1-8x10
4-2x10
2-4x8
2-2x10
3-2x10
2-3x10
1-4x10
2-4x10
3-3x10
1-6x10
4-2x10
2-4x8
3-2x10
2-3x10
2-4x10
3-3x10
1-6x10
1-8x10
4-2x10
2-2x12
2-2x12
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
Plank
Span
(ft.)
Nominal
Size
10
11
12
13
14
15
16
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
910
1,010
785
650
1,240
1,780
1,185
1,065
1,090
850
765
1,255
1,645
1,515
1,820
1,300
1,525
760
2,055
1,710
1,470
875
1,050
1,260
900
1,775
1,055
1,275
1,525
1,075
1,390
1,020
1,345
1,820
1,215
910
730
1,185
1,600
1,065
1,920
800
960
1,615
1,155
1,065
780
1,030
1,395
930
1,580
1,420
1,015
710
920
890
1,440
1,375
1,235
885
825
945
1,225
900
1,090
730
1,090
1,210
940
780
1,490
2,135
1,420
1,280
1,310
1,020
915
1,510
1,975
1,820
2,180
1,560
1,830
915
2,465
2,055
1,760
1,045
1,260
1,515
1,080
2,130
1,265
1,525
1,835
1,295
1,670
1,225
1,615
2,185
1,455
1,090
875
1,420
1,920
1,280
2,305
960
1,150
1,940
1,385
1,280
940
1,235
1,675
1,115
1,895
1,705
1,215
855
1,105
1,065
1,725
1,650
1,485
1,060
990
1,135
1,470
1,075
1,310
875
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 40 pounds per square foot within a deflection limitation of L/360. For instructions on use of table see Design Data For Beams on page 4.
Span = 7'-0" f b
(psi)
E
(psi)
10 psf DL 20 psf DL
2,040,000
1,700,000
1,460,000
840,000
820,000
980,000
700,000
1,940,000
1,120,000
1,090,000
1,310,000
930,000
730,000
650,000
1,450,000
1,960,000
1,410,000
1,700,000
1,210,000
850,000
940,000
710,000
610,000
1,600,000
1,800,000
1,200,000
1,080,000
1,540,000
770,000
1,380,000
1,540,000
1,020,000
1,840,000
770,000
920,000
2,010,000
1,440,000
1,340,000
1,690,000
1,240,000
1,680,000
1,860,000
1,240,000
930,000
750,000
720,000
910,000
900,000
2,000,000
1,500,000
1,350,000
960,000
900,000
1,130,000
830,000
1,120,000
1,250,000
830,000
1,840,000
1,660,000
1,180,000
1,110,000
1,390,000
1,020,000
1,120,000
750,000
1,060
1,180
915
755
1,445
2,075
1,385
1,245
1,275
990
890
1,465
1,920
1,765
2,120
1,515
1,780
890
2,395
2,000
1,710
1,020
1,225
1,475
1,050
2,070
1,230
1,485
1,780
1,255
1,625
1,190
1,570
2,125
1,415
1,060
850
1,380
1,865
1,245
2,240
935
1,120
1,885
1,345
1,245
910
1,205
1,625
1,085
1,840
1,655
1,185
830
1,070
1,035
1,680
1,605
1,445
1,030
960
1,105
1,430
1,045
1,275
850
1,270
1,415
1,095
910
1,735
2,490
1,660
1,495
1,525
1,190
1,070
1,760
2,300
2,120
2,545
1,820
2,135
1,065
2,875
2,395
2,055
1,220
1,475
1,765
1,260
2,485
1,480
1,780
2,140
1,510
1,950
1,430
1,885
2,550
1,700
1,275
1,020
1,655
2,240
1,495
2,690
1,120
1,345
2,260
1,615
1,495
1,095
1,445
1,950
1,300
2,210
1,990
1,420
995
1,285
1,245
2,015
1,925
1,730
1,235
1,155
1,325
1,715
1,255
1,530
1,020
Span = 8'-0" f b
(psi)
E
(psi)
10 psf DL 20 psf DL
2,380,000
1,980,000
1,700,000
980,000
960,000
1,150,000
820,000
2,260,000
1,300,000
1,270,000
1,530,000
1,090,000
850,000
760,000
1,690,000
2,290,000
1,650,000
1,980,000
1,410,000
990,000
1,100,000
830,000
710,000
1,870,000
2,100,000
1,400,000
1,260,000
1,800,000
900,000
1,610,000
1,790,000
1,190,000
2,150,000
900,000
1,080,000
2,350,000
1,680,000
1,560,000
1,970,000
1,440,000
1,960,000
2,170,000
1,450,000
1,090,000
870,000
840,000
1,060,000
1,050,000
2,330,000
1,750,000
1,570,000
1,120,000
1,050,000
1,320,000
970,000
1,310,000
1,460,000
970,000
2,150,000
1,930,000
1,380,000
1,290,000
1,620,000
1,190,000
1,300,000
870,000
1,210
1,345
1,045
865
1,655
2,370
1,580
1,420
1,455
1,130
1,020
1,675
2,190
2,020
2,425
1,730
2,030
1,015
2,740
2,285
1,955
1,165
1,400
1,685
1,200
2,370
1,410
1,695
2,035
1,435
1,855
1,360
1,795
2,425
1,620
1,215
970
1,580
2,135
1,420
2,560
1,065
1,280
2,155
1,540
1,420
1,040
1,375
1,860
1,240
2,105
1,895
1,350
950
1,225
1,185
1,920
1,835
1,650
1,180
1,100
1,260
1,630
1,195
1,455
970
1,455
1,615
1,255
1,040
1,985
2,845
1,895
1,705
1,745
1,360
1,220
2,010
2,630
2,425
2,910
2,075
2,440
1,220
3,290
2,740
2,350
1,395
1,685
2,020
1,445
2,840
1,690
2,035
2,445
1,725
2,230
1,635
2,155
2,915
1,940
1,455
1,165
1,895
2,560
1,705
3,070
1,280
1,535
2,585
1,845
1,705
1,250
1,650
2,230
1,485
2,525
2,270
1,625
1,140
1,470
1,420
2,300
2,200
1,980
1,415
1,320
1,515
1,960
1,435
1,750
1,165
E
(psi)
2,720,000
2,270,000
1,940,000
1,120,000
1,090,000
1,310,000
940,000
2,590,000
1,490,000
1,450,000
1,740,000
1,250,000
970,000
870,000
1,930,000
2,610,000
1,890,000
2,260,000
1,620,000
1,130,000
1,260,000
950,000
810,000
2,130,000
2,400,000
1,600,000
1,440,000
2,060,000
1,030,000
1,840,000
2,050,000
1,370,000
2,460,000
1,020,000
1,230,000
2,680,000
1,920,000
1,790,000
2,250,000
1,650,000
2,240,000
2,490,000
1,660,000
1,240,000
990,000
960,000
1,210,000
1,200,000
2,670,000
2,000,000
1,800,000
1,280,000
1,200,000
1,510,000
1,110,000
1,500,000
1,660,000
1,110,000
2,460,000
2,210,000
1,580,000
1,470,000
1,860,000
1,360,000
1,490,000
990,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN WOOD COUNCIL

WOOD CONSTRUCTION DATA 4
Table 10 Floor and Roof Beams (Cont.)
Plank
Span
(ft.)
Nominal
Size
17
18
19
20
21
22
Span = 6'-0" f b
(psi)
10 psf DL 20 psf DL
1,305
1,215
1,155
1,370
1,030
820
1,235
820
880
1,075
775
1,110
1,420
1,140
1,140
1,220
1,090
815
1,540
1,025
1,100
1,340
985
735
770
670
855
740
860
1,230
1,075
845
1,255
1,255
1,345
920
985
1,205
880
660
690
1,285
1,025
785
585
1,365
1,290
1,535
1,150
920
1,380
1,200
895
940
985
1,035
900
1,040
1,490
1,305
1,025
990
710
955
820
950
1,355
1,190
935
905
1,375
1,375
1,565
1,460
1,385
1,645
1,235
985
1,480
985
1,055
1,285
930
1,330
1,705
1,365
1,365
1,465
1,305
975
1,850
1,230
1,320
1,610
1,180
880
925
805
1,025
890
1,030
1,475
1,295
1,015
1,505
1,505
1,615
1,105
1,185
1,445
1,060
790
830
1,540
1,230
945
705
1,635
1,550
1,845
1,380
1,105
1,660
1,440
1,075
1,130
1,180
1,240
1,080
1,250
1,785
1,565
1,230
1,190
850
1,145
980
1,135
1,630
1,425
1,120
1,085
1,650
1,650
2-4x10
2-3x12
3-3x12
2-4x12
1-6x12
1-8x12
3-4x12
4-3x12
4-2x12
5-2x12
2-3x12
3-3x12
2-4x12
1-6x12
1-8x12
3-4x12
4-3x12
3-3x10
1-8x10
3-2x12
4-2x12
5-2x12
2-3x12
3-3x12
2-4x12
1-6x12
1-8x12
3-4x12
3-3x10
1-8x10
3-2x12
4-2x12
5-2x12
2-6x12
1-10x12
2-3x14
4-2x12
5-2x12
3-3x12
2-4x12
1-8x12
3-4x12
4-3x12
2-6x12
5-2x12
3-3x12
3-4x12
4-3x12
2-6x12
1-10x12
2-3x14
1-6x14
2-4x14
3-3x14
3-4x14
1-8x14
1-10x12
2-3x14
1-6x14
2-4x14
5-2x12
3-3x12
2-4x12
1-8x12
3-4x12
4-3x12
2-6x12
1-10x12
2-3x14
1-6x14
2-4x14
3-3x14
Required values for fiber stress in bending (f b
) and modulus of elasticity (E) for the sizes shown to support safely a live load of 40 pounds per square foot within a deflection limitation of L/360. For instructions on use of table see Design Data For Beams on page 4.
E
(psi) 10 psf DL
Span = 7'-0" f b
(psi)
20 psf DL
1,720,000
1,610,000
1,490,000
1,490,000
1,120,000
890,000
1,340,000
890,000
960,000
1,140,000
1,870,000
1,250,000
1,340,000
1,590,000
1,170,000
890,000
940,000
800,000
920,000
1,150,000
1,820,000
1,460,000
1,460,000
1,560,000
1,360,000
1,040,000
840,000
640,000
1,910,000
1,760,000
1,770,000
1,330,000
1,060,000
1,590,000
1,060,000
1,140,000
1,360,000
990,000
760,000
800,000
1,560,000
1,250,000
1,090,000
930,000
1,080,000
1,340,000
1,150,000
900,000
1,690,000
1,690,000
1,810,000
1,580,000
1,200,000
1,260,000
1,080,000
1,250,000
1,550,000
1,330,000
1,050,000
1,030,000
1,940,000
1,940,000
1,380,000
1,450,000
1,240,000
1,430,000
1,780,000
1,530,000
1,200,000
1,190,000
850,000
1,120,000
1,520
1,420
1,345
1,600
1,200
960
1,440
960
1,030
1,250
905
1,295
1,660
1,325
1,325
1,420
1,270
950
1,795
1,200
1,285
1,565
1,145
855
900
780
995
865
1,005
1,435
1,255
990
1,465
1,465
1,570
1,075
1,150
1,405
1,030
770
805
1,495
1,200
920
685
1,590
1,510
1,790
1,345
1,075
1,615
1,400
1,045
1,100
1,145
1,205
1,050
1,215
1,735
1,520
1,195
1,160
825
1,115
955
1,105
1,585
1,385
1,090
1,055
1,605
1,605
1,825
1,700
1,615
1,920
1,440
1,150
1,725
1,150
1,235
1,500
1,085
1,555
1,990
1,595
1,595
1,705
1,525
1,140
2,155
1,440
1,540
1,875
1,375
1,025
1,080
940
1,195
1,040
1,205
1,720
1,510
1,185
1,755
1,755
1,880
1,290
1,380
1,685
1,235
920
970
1,795
1,440
1,100
820
1,910
1,810
2,150
1,615
1,290
1,935
1,680
1,255
1,315
1,375
1,445
1,260
1,455
2,085
1,825
1,435
1,390
990
1,340
1,145
1,325
1,900
1,665
1,305
1,265
1,925
1,925
Span = 8'-0" f b
(psi)
E
(psi) 10 psf DL 20 psf DL
2,010,000
1,880,000
1,730,000
1,740,000
1,300,000
1,040,000
1,570,000
1,040,000
1,120,000
1,330,000
2,180,000
1,460,000
1,560,000
1,860,000
1,360,000
1,040,000
1,090,000
930,000
1,080,000
1,340,000
2,120,000
1,700,000
1,700,000
1,820,000
1,590,000
1,210,000
980,000
750,000
2,230,000
2,060,000
2,060,000
1,550,000
1,240,000
1,860,000
1,240,000
1,330,000
1,580,000
1,160,000
880,000
930,000
1,820,000
1,460,000
1,270,000
1,080,000
1,260,000
1,560,000
1,340,000
1,050,000
1,970,000
1,970,000
2,110,000
1,840,000
1,400,000
1,480,000
1,260,000
1,450,000
1,810,000
1,550,000
1,220,000
1,200,000
2,260,000
2,260,000
1,620,000
1,700,000
1,440,000
1,670,000
2,080,000
1,780,000
1,400,000
1,380,000
990,000
1,310,000
1,735
1,620
1,535
1,825
1,370
1,095
1,645
1,095
1,175
1,430
1,035
1,480
1,895
1,515
1,515
1,625
1,450
1,085
2,055
1,370
1,465
1,785
1,310
980
1,025
895
1,140
990
1,145
1,640
1,435
1,130
1,675
1,675
1,790
1,230
1,315
1,605
1,175
880
920
1,710
1,370
1,050
785
1,820
1,725
2,050
1,535
1,230
1,845
1,600
1,195
1,255
1,310
1,375
1,200
1,385
1,985
1,740
1,365
1,325
945
1,275
1,090
1,265
1,810
1,585
1,245
1,205
1,835
1,835
2,085
1,945
1,845
2,190
1,645
1,315
1,975
1,315
1,410
1,715
1,240
1,775
2,275
1,820
1,820
1,950
1,740
1,300
2,465
1,645
1,760
2,145
1,570
1,175
1,230
1,070
1,365
1,190
1,375
1,970
1,725
1,355
2,005
2,005
2,150
1,475
1,580
1,925
1,410
1,055
1,105
2,055
1,645
1,260
940
2,180
2,070
2,460
1,845
1,475
2,210
1,920
1,435
1,505
1,575
1,650
1,435
1,665
2,380
2,085
1,640
1,590
1,135
1,530
1,310
1,515
2,170
1,900
1,495
1,445
2,205
2,205
E
(psi)
2,300,000
2,150,000
1,980,000
1,990,000
1,490,000
1,190,000
1,790,000
1,190,000
1,280,000
1,520,000
2,500,000
1,660,000
1,780,000
2,130,000
1,560,000
1,190,000
1,250,000
1,060,000
1,230,000
1,530,000
2,430,000
1,940,000
1,940,000
2,080,000
1,820,000
1,390,000
1,120,000
850,000
2,550,000
2,350,000
2,360,000
1,770,000
1,420,000
2,120,000
1,420,000
1,520,000
1,810,000
1,330,000
1,010,000
1,060,000
2,080,000
1,660,000
1,460,000
1,240,000
1,440,000
1,780,000
1,530,000
1,200,000
2,250,000
2,250,000
2,410,000
2,100,000
1,610,000
1,690,000
1,430,000
1,660,000
2,060,000
1,770,000
1,390,000
1,380,000
2,580,000
2,580,000
1,850,000
1,940,000
1,650,000
1,910,000
2,370,000
2,040,000
1,600,000
1,580,000
1,130,000
1,500,000
Copyright © American Wood Council. Downloaded/printed pursuant to License Agreement. No further reproductions authorized.
AMERICAN FOREST & PAPER ASSOCIATION
35

Phone: 202-463-4713
Fax: 202-463-2791 awcinfo@afandpa.org
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