Heavy-Duty
Steel Bar Grating
Laurel Steel Division
Company Profile
Laurel Steel, a division of 0/3
Steel, has been manufacturing
heavy-duty steel bar grating since 1983, and
is a member in good standing of the Metal
Bar Grating Division of the National
Association of Architectural Metal
Manufacturers. Over the past 18 years,
Laurel Steel has grown into a major
producer in the heavy-duty grating market,
with a reputation for quality products,
on-time deliveries and competitive prices.
Located in rural Everson, PA, but convenient
to interstates for ready access to major
transportation routes, Laurel Steel is well
positioned to expand its current 30,000
square foot manufacturing facility as growth
in all market segments continues.
Laurel Steel has continually modernized
its equipment and significantly increased
fabrication capacity. Large capacity
hydraulic presses with automated feed
lines, an extensive and ever-widening range
of standard fixtures and high-production
robotics are all utilized to supply all of
your heavy-duty grating needs efficiently
and economically.
In addition to its core heavy-duty grating
product line, Laurel Steel has become
one of the largest suppliers of roadway/
commercial inlet frames and grates to the
local construction industry. And throughout
its history, Laurel Steel has never been
afraid to tackle the out-of-the-ordinary
‘specials’ that other manufacturers avoid.
Hopper covers, heavy material-handling
screens, high impact-resistant grates from
special alloys — even complex radio
frequency screens for national security
installations — have been and continue to
be successfully manufactured at Laurel Steel.
Heavy-Duty Grating... Inlets...
Special Fabrications... Walkway Grating...
Expanded Metal...
Recently, Laurel Steel has satisfied the
Laurel Steel also services its growing
needs of contractors who are required to
customer base with a large inventory of stan-
provide gratings heavy enough to withstand
dard walkway grating and expanded metal
vehicle loads, yet still comply with the federal
products, available in either stock panels or
Call Laurel Steel for any of these items,
Americans with Disabilities Act (ADA).
completely fabricated projects.
and let us put our experience and efficiency
to work for you.
2
Table of Contents
Company Profile ............................................................................Inside Front Cover
Heavy-Duty Welded Steel Grating ........................................................................4
Product Introduction ........................................................................................4
Standard Grating Designation ..........................................................................4
Product Options
Bearing Bar Spacing ..........................................................................................5
Bearing Bar Material ..........................................................................................5
Crossbar Options................................................................................................5
Surface Options ................................................................................................5
Banding ............................................................................................................5
Design Criteria ..................................................................................................6
Uniform and Concentrated Loads ........................................................................6
Vehicle Loads ....................................................................................................7
Heavy-Duty Grating Load Tables ......................................................................8-13
Standard Panel Width Charts........................................................................14-15
Miscellaneous
Fabrication and Installation Tolerances ..........................................................16-17
Anchoring Details..............................................................................................18
Banding ..........................................................................................................19
Ordering a Laurel Steel Heavy-Duty Steel Grating ........................................20
Americans with Disabilities Act (ADA), and
Close Mesh Grating ........................................................................................21
Special Fabrications
Egg Crates/Grizzlies/Supplementary Bar Grating ................................................22
Roadway Inlets and Frames ......................................................................23-24
Walkway Grating
Product Description ........................................................................................25
Design Tables
Standard Panel Widths, Weights/SF ..................................................................26
Carbon Steel ....................................................................................................27
Stainless Steel ................................................................................................28
Aluminum ........................................................................................................29
Miscellaneous
Fabrication Tolerances ......................................................................................30
Installation Tolerances ......................................................................................31
Anchoring Details..............................................................................................32
Welding Standards............................................................................................33
Stair Treads ................................................................................................34-35
Expanded Metal
Product Description ........................................................................................36
Design Tables
Stainless Steel:
Standard/Flattened ..............................................................37
Aluminum:
Standard/Flattened ..............................................................37
Carbon Steel:
Standard/Flattened ..........................................................38-39
Expanded Metal Grating
Design Tables ..................................................................................................40
Selection Chart ................................................................................................40
Glossary ................................................................................................................41
Code of Standard Practice ..................................................................................42
3
Heavy-Duty Welded Steel Grating
Laurel Steel built its business and its
reputation manufacturing heavy-duty steel
bar grating, which remains its core product
line. Laurel Steel manufactures handwelded heavy-duty grating, which is by
far the most efficient process, as it
provides job-shop versatility without
sacrificing economy.
This versatile product can safely support
heavy traffic vehicles, while satisfying
drainage and airflow requirements in
countless applications. From trench grating
designed to carry everything from heavy
forklift traffic to military aircraft, to loading
docks, mezzanine floors, vault covers,
material screens and wash racks, heavyduty grating is used to permit immediate
drainage from rain or other sources, or
simplify ventilation and heating in buildings.
Many designers have discovered countless
economical solutions through the use of
heavy-duty steel grating.
A complete description of standard
nomenclature for heavy-duty grating follows,
as well as what rules govern its design.
Laurel Steel can supply all of the standard
products covered by NAAMM, and adheres
to the standards of voluntary compliance
established by them. (ANSI/NAAMM
MBG 532-00)
Standard Grating Designation
the application. Bearing bars are connected
by cross bars welded to the bearing bars.
Laurel Steel complies with industry convenThe center-to-center dimension of the bearing
tions in naming the various grating products.
bars is described as the number of sixAll Laurel Steel gratings are welded and,
teenths of an inch; the center-to-center
therefore, all carry a W designation in
dimension of the cross bars is a whole
standard NAAMM nomenclature.
number expressed in inches. A grating
The primary load-carrying component of
designated as 22-W-4 has steel flat bars
grating is called a bearing bar. A grating bear-
spaced twenty-two sixteenths of an inch
ing bar is a flat bar of virtually any height,
(1-3/8") center-to-center, and the cross bars
thickness or steel grade. Bearing bars are
are spaced 4" center-to-center. The bearing
positioned at a constant spacing, depending
bar/cross bar joint is welded.
on the strength and open-air requirements of
4
Product Options
This section describes the options available
to a designer or user of heavy-duty steel
cross bars, round or rectangular, are also
Bearing Bar Material
available for additional load distribution.
While the bearing bar material of most
grating. The accompanying sketch illustrates
Laurel Steel heavy-duty grating is supplied in
Round cross bars are plug welded to bearing
conventional carbon steel grades — such as
bars. Rectangular cross bars are welded
Bearing Bar Spacings
ASTM A709, Grade 36 — grating can be
to bearing bars using various methods
Theoretically, any bearing bar spacing
fabricated in just about any material, as
depending on material, bearing bar spacing,
can be provided; however, the array of
long as it can be practically obtained from
and other factors.
“standard” industry spacings are adequate
a mill, warehouse or processor. High
Surface Options
to cover the overwhelming majority of
strength carbon steel and weathering steel
heavy-duty grating applications.
grades, as well as common grades of
those options.
For most applications a smooth bearing bar
is adequate. Where additional traction or skid
stainless steel, can be used to fabricate
Pages 8 through 13 contain design tables for
those spacings that are most common for
resistance is required, a serrated surface
heavy-duty welded steel bar grating. Laurel
can be applied to grating bearing bars. For
Steel is a major supplier of grating fabricated
heavy-duty steel bar grating. In addition to
maximum skid resistance, grating can be
from abrasion-resistant steels for that
those designs, Laurel Steel has assembly
supplied with serrated bearing bars and
demanding application. Please inquire about
fixtures for many other spacings which are
rectangular, serrated cross bars.
the availability of special grades.
less commonly specified. Those spacings are
Banding
Cross Bar Options
shown below:
A flat bar can be welded to the ends of the
The cross bar of a heavy-duty grating rigidly
7W 8W
9W
12W 13W 16W
grating panel for cosmetic reasons, or to
holds the bearing bars at the specified
provide additional distribution of grating bars
Having all of these spacing options means
spacing. The standard cross bar used in
that Laurel Steel can satisfy practically any
Laurel Steel heavy-duty grating is a smooth
clear opening requirement. By varying the
round cross bar, the size of which complies
bearing bar size to accommodate a particular
with NAAMM cross sectional area require-
strength criteria, design choices are nearly
ments. On some applications, where traffic
limitless. Grating designs with openings
is primarily in the direction of the grating
from 3/16" to 2" and beyond, capable of
cross bars, or where wheels turn directly
supporting the heaviest loads, are possible.
on the grating, a rectangular cross bar
to supports. Unless otherwise directed, the
band bar is of the same depth and thickness
as the bearing bar. The standard weld
pattern for banding is described by NAAMM
and is shown on page 19.
provides additional lateral stiffness and load
distribution, ensuring serviceability. Bottom
SERRATED RECTANGULAR
CROSS BAR
SERRATED BEARING BAR
SMOOTH BEARING BAR
G
IN
AC
AN
SP
AR
SB
CL
SP
CL
OS
CR
BE
AR
CL
IN
G
CL
BA
R
SP
AC
IN
G
SPECIFY BEARING
BAR HEIGHT &
THICKNESS
SPECIFY HEIGHT & THICKNESS
OF RECTANGULAR CROSS BAR
SMOOTH RECTANGULAR CROSS BAR
WI
DT
H
SPECIFY Ø OF
ROUND CROSS BAR
BAND BAR (OPTIONAL)
5
Design Criteria for Heavy-Duty Grating
For the design of heavy-duty bar grating, load
Calculate the concentrated midspan and uniform load bearing capabilities, and resultant
bearing capabilities and deflections are
deflections, of a 38-W-4 (3 x 3/8) heavy-duty welded steel bar grating on a 48" span:
based on the structural properties of the
bearing bars and the number of bearing bars
b = bearing bar thickness
=
0.375"
that the allowable stresses of the metals
d = bearing bar height
=
3"
used are not exceeded when design loads
Allowable stress, F
=
20,000 psi
A-36 steel
Modulus of Elasticity, E
=
29,000,000 psi
A-36 steel
Span, L
=
48"
Bearing bar spacing, AW
=
2.375"
Number of bearing bars/ft width, K
=
12/2.375
=
5.0526
Section Modulus/ft width, Sg
Sg = Kbd2/6
=
5.0526 x 0.375 x (3)2 /6
=
2.842 in3
Moment of Inertia/ft width, Ig
Ig = Kbd3/12
=
5.0526 x 0.375 x (3)3 /12
=
4.263 in4
which provide uniform and concentrated
Maximum bending moment/ft width, Mg
=
FSg
loads for most common heavy-duty grating
Mg
=
20,000 x 2.842
=
56,840 lb-in
supporting the load. Grating is designed so
are applied, or if deflection governs, specified
allowances for deflection are not exceeded.
Grating Design Based on Concentrated
and Uniform Loads
Static concentrated and uniform loads are
handled using simple moment formulas,
assuming simply supported beams,
with maximum moments and deflections
occurring at midspan. Complete load tables
spacings and bearing bar sizes are given in
the NAAMM Heavy-Duty Bar Grating Manual
MBG 532. Those tables can be viewed and
downloaded from the NAAMM website
www.naamm.org. The method by which those
values are calculated is illustrated in a
design example.
Uniform Load
U = 98Mg/L2
D = 5UL4/4608EIg
Concentrated Load
= 96 x 56,840/(48)2 = 2368 lbs/sq. ft.
C = 4Mg/L
= 5 x 2368 x (48)4/4608 x 29,000,000 x 4.263 = 0.110 inches
DC = CL3/48EIg = 4737 (48)3/48 x 29,000,000 x 4.263
NOTE: For each load case, deflection is <0.12" (L/400), so design is satisfactory.
6
= 4 x 56,840/48
= 4737 pounds/foot width
= 0.088 inches
Vehicular Load Design
Design of heavy-duty steel bar grating for
The following chart illustrates how various loads are distributed on a 19W4 Steel Grating.
vehicular loads is based on the American
Association of State Highway and
Design Loads Distributed on a 19W4 Steel Grating
Transportation Officials (AASHTO) Standard
Load Distribution
Specifications for Highway Bridges. Whereas
the Concentrated and Uniform Loads as dis-
Design Load
cussed previously are based on one foot of
Wheel Load
(includes 30% impact)
a
b
grating width, AASHTO rules allow for the dis-
no. Bearing Bars
under load
(b/bearing bar
centers)
tribution of loads over a specified area.
According to AASHTO Article 3.27.3.1
H-25
26,000#
22.4"
25" + 2(1-3/16)
or 27.375"
23.0
H-20
20,800#
20"
20" + 2(1-3/16")
or 22.375"
18.8
H-15
15,600#
15"
15"+ 2(1-3/16")
or 17.375"
14.6
5 - Ton
13,480#
11"
11"+ 2(1-3/16")
or 13.375"
11.3
3 - Ton
8,730#
7"
7" + 2(1-3/16")
or 9.375"
7.9
1 - Ton
3,425#
4"
4" + 2(1-3/16")
or 6.375"
5.4
“A wheel load shall be distributed, normal
to the main elements, over a width equal
to 1-1/4" per ton of axle load plus twice the
distance center-to-center of main elements.
The por tion of the load assigned to each
main element shall be applied uniformly
over a length equal to the rear tire width
(22.4 inches for H-25, 20 inches for H-20,
15" for H-15).”
How these formulas impact design is
illustrated in the accompanying chart.
For the chart, the following nomenclature
The AASHTO load distribution formulas can
resource for the design of heavy-duty steel
is used:
result in grating designs requiring larger
bar grating. As a service to our customers,
Section Moduli for lighter loads on shorter
Laurel Steel has software programs devel-
spans. For example, the maximum safe clear
oped for all loading conditions and can
span for a Type 19W4 grating with a
provide design information specific to your
1-1/2 x 1/4" bearing bar, when designing for
requirement. Please do not hesitate to
Normal to Span, = a + (2s),
an AASHTO H-20 wheel load (20,800#) is
contact us, via phone, fax or e-mail.
where s = c/c of bearing bars
16". That same grating design has a smaller
a
= Partial Load Contact Area
Parallel to the Span (in inches)
b
= Partial Load Contact Area
safe span (13") when the design
In addition to the H-25 (22.4"), H-20 (20")
criteria is just a 1 Ton capacity forklift
and H-15 (15") classifications as discussed
(3425# wheel load) because of the
in the AASHTO Article, a is further defined for
difference in how loads are distributed.
the following cases:
Care should be taken to apply the most
5-Ton Capacity Lift Truck, a = 11"
3-Ton Capacity Lift Truck, a = 7"
Note also that NAAMM publishes a
Example: In designing a 19W4 heavy-duty
pages provide common grating designs
and bar sizes, along with the maximum
recommended span for the six load
categories shown in the above chart.
severe potential loading to which the grating
may be subjected.
1-Ton Capacity Lift Truck, a = 4"
The load tables shown on the following
comprehensive ENGINEERING DESIGN
MANUAL (MBG 534) which is an excellent
The information contained herein has been prepared
in accordance with generally accepted engineering
principles. However, Laurel Steel disclaims any
responsibility for any errors that may be contained
herein. The user of the information contained herein
should check the information supplied, and make an
independent determination as to its applicability to
any par ticular project or application.
steel bar grating (which has bearing bars
spaced at 1-3/16" center-to-center) to
suppor t an H-20 load, the specified
20,800# wheel load is distributed
over 20" in the direction of the bearing
bar, and 22-3/8" normal to the bearing
bar (20" + 2s). Therefore, 18.8 bearing bars
(24-3/4" / 1-3/16") par ticipate in
resisting the load.
7
Load Table for Heavy-Duty Bar Grating Type 11W4 – Simple Spans
11
/1
11
6"
CL
CL
CL
/1
6"
CL
CL
CL
CL
4"
2"
CL
11W4
11W2
NOTE: The design capacity of any product shown is the same regardless of cross bar spacing.
Bar
Size
1 x 1/4"
1 x 5/16"
1 x 3/8"
1-1/4 x 1/4"
1-1/4 x 5/16"
1-1/4 x 3/8"
1-1/2 x 1/4"
1-1/2 x 5/16"
1-1/2 x 3/8"
1-3/4 x 1/4"
1-3/4 x 3/8"
2 x 1/4"
2 x 5/16"
2 x 3/8"
2-1/4 x 1/4"
2-1/4 x 3/8"
2-1/2 x 1/4"
2-1/2 x 5/16"
2-1/2 x 3/8"
3 x 1/4"
3 x 5/16"
3 x 3/8"
3-1/2 x 1/4"
3-1/2 x 3/8"
4 x 1/4"
4 x 5/16"
4 x 3/8"
Weight
#/SF
16.0
19.7
23.4
19.7
24.3
28.9
23.4
28.9
34.5
27.1
40.1
30.8
38.2
45.6
34.5
51.2
38.2
47.5
56.7
46.5
57.6
67.9
53.9
79.9
61.3
75.3
91.0
Section
Modulus
per foot
width
0.727
0.909
1.091
1.136
1.42
1.704
1.636
2.045
2.454
2.227
3.340
2.908
3.635
4.363
3.681
5.521
4.544
5.680
6.816
6.544
8.180
9.816
8.907
13.360
11.633
14.542
17.450
Standard
Cross Bar
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
Maximum Safe Clear Span
1 Ton
3 Ton
5 Ton
H-15
H-20
H-25
0'-9"
0'-11"
1'-1"
1'-1"
1'-4"
1'-7"
1'-7"
1'-11"
2'-3"
2'-1"
3'-0"*
2'-8"
3'-4"
3'-8"*
3'-4"
4'-5"*
4'-1"
4'-8"*
5'-2"*
5'-6"*
6'-2"*
6'-9"*
7'-0"*
8'-4"*
8'-4"*
9'-2"*
10'-2"*
0'-8"
0'-9"
0'-10"
0'-10"
1'-0"
1'-2"
1'-2"
1'-4"
1'-7"
1'-5"
2'-0"
1'-10"
2'-2"
2'-7"
2'-3"
3'-2"
2'-8"
3'-3"
3'-11"
3'-9"
4'-7"
5'-4"*
5'-0"
6'-8"*
6'-7"
7'-6"*
8'-2"*
0'-9"
0'-11"
1'-0"
1'-0"
1'-2"
1'-4"
1'-3"
1'-6"
1'-8"
1'-7"
2'-1"
1'-11"
2'-3"
2'-8"
2'-4"
3'-3"
2'-9"
3'-4"
3'-11"
3'-9"
4'-7"
5'-3"*
5'-0"
6'-7"*
6'-4"
7'-4"*
8'-0"*
1'-0"
1'-1"
1'-3"
1'-3"
1'-5"
1'-7"
1'-7"
1'-9"
2'-0"
1'-11"
2'-6"
2'-3"
2'-9"
3'-1"*
2'-9"
3'-8"*
3'-3"
3'-11"
4'-3"*
4'-5"
5'-2"*
5'-7"*
5'-9"*
7'-1"*
7'-0"*
7'-10"*
8'-7"*
1'-2"
1'-3"
1'-5"
1'-5"
1'-7"
1'-9"
1'-9"
2'-0"
2'-2"*
2'-1"
2'-8"*
2'-5"
2'-10"
3'-2"*
2'-11"
3'-9"*
3'-5"
3'-11"*
4'-4"
4'-6"
5'-1"*
5'-7"*
5'-9"*
7'-0"*
7'-0"*
7'-10"*
8'-6"*
1'-2"
1'-4"
1'-6"*
1'-6"
1'-8"
1'-10"*
1'-10"
2'-0"
2'-3"*
2'-2"
2'-8"*
2'-6"
2'-11"
3'-2"*
3'-0"
3'-9"*
3'-5"
4'-0"*
4'-4"*
4'-7"
5'-1"*
5'-7"*
5'-9"*
7'-0"*
7'-0"*
7'-9"*
9'-10"*
Weights are approximate, and can var y depending on panel width, type of cross bar, and mill and fabrication tolerances.
Weights shown are based on 4" cross bar centers.
Section Modulus based on 17.45 Bars/Foot Width.
*Span limited by deflection (L/400 maximum).
For serrated grating design, increase bearing bar depth to next deeper size shown in chart.
8
Load Table for Heavy-Duty Bar Grating Type 15W4 – Simple Spans
15
6"
CL
/1
6"
CL
CL
/1
CL
CL
CL
CL
15
4"
CL
2"
15W4
15W2
NOTE: The design capacity of any product shown is the same regardless of cross bar spacing.
Bar
Size
1 x 1/4"
1 x 5/16"
1 x 3/8"
1-1/4 x 1/4"
1-1/4 x 5/16"
1-1/4 x 3/8"
1-1/2 x 1/4"
1-1/2 x 5/16"
1-1/2 x 3/8"
1-1/2 x 1/2"
1-3/4 x 1/4"
1-3/4 x 3/8"
2 x 1/4"
2 x 5/16"
2 x 3/8"
2 x 1/2"
2-1/4 x 1/4"
2-1/4 x 3/8"
2-1/2 x 1/4"
2-1/2 x 5/16"
2-1/2 x 3/8"
2-1/2 x 1/2"
3 x 1/4"
3 x 5/16"
3 x 3/8"
3 x 1/2"
3-1/2 x 1/4"
3-1/2 x 3/8"
3-1/2 x 1/2"
4 x 1/4"
4 x 5/16"
4 x 3/8"
4 x 1/2"
4-1/2 x 1/4"
4-1/2 x 3/8"
4-1/2 x 1/2"
5 x 1/4"
5 x 5/16"
5 x 3/8"
5 x 1/2"
6 x 1/4"
6 x 5/16"
6 x 3/8"
6 x 1/2"
Weight
#/SF
12.2
14.9
17.7
14.9
18.4
21.8
17.7
21.8
26
34.3
20.5
30.1
23.2
28.7
34.3
45.3
26.0
38.4
28.7
35.6
42.6
56.4
35.2
43.4
51.7
68.3
40.7
60
79.4
46.2
57.3
68.3
90.4
51.7
76.6
101.5
57.3
71.1
84.9
112.5
68.3
84.9
101.4
134.6
Section
Modulus
per foot
width
0.533
0.667
0.80
0.833
1.042
1.250
1.20
1.50
1.80
2.40
1.633
2.450
2.133
2.667
3.20
4.267
2.70
4.050
3.333
4.167
5.00
6.667
4.80
6.00
7.20
9.60
6.533
9.800
13.067
8.533
10.667
12.80
17.07
10.80
16.20
21.60
13.333
16.667
20.0
26.667
19.20
24.0
28.80
38.40
Standard
Cross Bar
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
Maximum Safe Clear Span
1 Ton
3 Ton
5 Ton
H-15
H-20
H-25
0'-8"
0'-9"
0'-11"
0'-11"
1'-1"
1'-4"
1'-3"
1'-7"
1'-10"
2'-5"
1'-8"
2'-6"
2'-2"
2'-8"
3'-2"
3'-10"*
2'-8"
3'-11"*
3'-4"
4'-1"
4'-7"*
5'-4"*
4'-8"
5'-6"*
6'-1"*
7'-0"*
6'-2"
7'-6"*
8'-7"*
7'-6"*
8'-4"*
9'-0"*
10'-4"*
8'-10"*
10'-8"*
12'-0"*
10'-4"*
11'-4"*
12'-8"*
13-10"*
13'-4"*
14'-6"*
15'-10"*
16'-8"*
0'-7"
0'-8"
0'-9"
0'-9"
0'-10"
1'-0"
0'-11"
1'-1"
1'-3"
1'-7"
1'-2"
1'-8"
1'-6"
1'-9"
2'-1"
2'-8"
1'-9"
2'-7"
2'-2"
2'-7"
3'-1"
4'-0"
3'-0"
3'-8"
4'-2"
5'-5"*
3'-11"
5'-9"
6'-7"*
5'-1"
6'-3"
7'-0"*
8'-2"*
6'-4"
8'-4"*
9'-2"*
7'-9"
8'-10"*
9'-10"*
10'-4"*
10'-2"*
11'-2"*
12'-0"*
14'-4'*
0'-8"
0'-9"
0'-10"
0'-10"
1'-0"
1'-1"
1'-1"
1'-3"
1'-5"
1'-8"
1'-3"
1'-9"
1'-7"
1'-10"
2'-1"
2'-8"
1'-10"
2'-7"
2'-2"
2'-10"
3'-1"
3'-11"
3'-0"
3'-7"
4'-3"*
5'-3"*
3'-11"
5'-7"
6'-7"*
4'-11"
6'-1"
7'-0"*
7'-11"*
6'-2"
8'-2"*
9'-4"*
7'-6"
8'-9"*
9'-7"*
10'-10"*
10'-2"*
11'-4"*
12'-4"*
14'-0"*
0'-10"
1'-0"
1'-1"
1'-1"
1'-3"
1'-4"
1'-4"
1'-6"
1'-8"
2'-0"
1'-7"
2'-1"
1'-10"
2'-2"
2'-6"
3'-1"*
2'-3"
3'-0"
2'-7"
3'-1"
3'-7"
4'-4"*
3'-6"
4'-2"
4'-11"*
5'-7"*
4'-6"
6'-1"
7'-0"*
5'-9"
6'-9"*
7'-5"*
8'-6"*
7'-1"
8'-9"*
10'-0"*
8'-5"*
9'-4"*
10'-2"*
11'-7"*
11'-0"*
12'-2"*
13'-2"*
14'-10"*
1'-0"
1'-1"
1'-3"
1'-3"
1'-5"
1'-6"
1'-6"
1'-8"
1'-10"
2'-2"*
1'-9"
2'-3"
2'-0"
2'-4"
2'-8"
3'-2"*
2'-4"
3'-2"
2'-9"
3'-3"
3'-9"
4'-4"*
3'-7"
4'-4"
4'-10"*
5'-7"*
4'7"
6'-1"*
7'-0"*
5'-9"
6'-9"*
7'-4"*
8'-4"*
7'-1"
8'-8"*
9'-0"*
8'-5"*
9'-3"*
10'-1"*
11'-6"*
10'10"*
12'-0"*
13'-0"*
14'-6"*
1'-0"
1'-2"
1'-3"
1'-4"
1'-5"
1'-7"
1'-7"
1'-9"
1'-11"
2'-3"*
1'-10"
2'-4"
2'-1"
2'-5"
2'-9"
3'-2"*
2'-5"
3'-3"
2'-10"
3'-3"
3'-9"
4'-4"*
3'-8"
4'-4"
4'-10'*
5'-7"*
4'-8"
6'0"*
6'-10"*
5'-10"
6'-8'*
7'-3"*
8'-4"*
7'-1"
8'-7"*
9'-11"*
8'-2"*
9'-2"*
10'-0"*
11'-4"*
10'-8"*
11'-11"*
12'-10"*
14'-6"*
Weights are approximate, and can var y depending on panel width, type of cross bar, and mill and fabrication tolerances.
Weights shown are based on 4" cross bar centers.
Section Modulus based on 12.8 bars/foot.
*Span limited by deflection (L/400 maximum).
For serrated grating design, increase bearing bar depth to next deeper size shown in char t.
9
Load Table for Heavy-Duty Bar Grating Type 19W4 – Simple Spans
1-3
/1
CL
CL
1-3
6"
CL
/1
6"
CL
CL
CL
CL
CL
4"
2"
19W4
19W2
NOTE: The design capacity of any product shown is the same regardless of cross bar spacing.
Bar
Size
Weight
#/SF
Section
Modulus
per foot
width
Standard
Cross Bar
1 x 1/4"
1 x 5/16"
1 x 3/8"
1-1/4 x 1/4"
1-1/4 x 5/16"
1-1/4 x 3/8"
1-1/2 x 1/4"
1-1/2 x 5/16"
1-1/2 x 3/8"
1-1/2 x 1/2"
1-3/4 x 1/4"
1-3/4 x 3/8"
2 x 1/4"
2 x 5/16"
2 x 3/8"
2 x 1/2"
2-1/4 x 1/4"
2-1/4 x 3/8"
2-1/2 x 1/4"
2-1/2 x 5/16"
2-1/2 x 3/8"
2-1/2 x 1/2"
3 x 1/4"
3 x 5/16"
3 x 3/8"
3 x 1/2"
3-1/2 x 1/4"
3-1/2 x 3/8"
3-1/2 x 1/2"
4 x 1/4"
4 x 5/16"
4 x 3/8"
4 x 1/2"
4-1/2 x 1/4"
4-1/2 x 3/8"
4-1/2 x 1/2"
5 x 1/4"
5 x 5/16"
5 x 3/8"
5 x 1/2"
6 x 1/4"
6 x 5/16"
6 x 3/8"
6 x 1/2"
9.9
12.1
14.3
12.1
14.8
17.6
14.3
17.6
20.9
27.9
16.4
24.1
18.7
23
27.5
36.8
20.9
30.7
23.1
28.6
34
45.7
27.5
34
41.5
54.7
31.9
48.1
63.5
36.2
45.9
54.7
72.2
41.5
61.3
81.0
45.9
56.9
67.8
89.8
54.7
67.8
81
109.1
0.421
0.526
0.632
0.658
0.822
0.987
0.947
1.184
1.421
1.895
1.289
1.934
1.684
2.105
2.526
3.368
2.132
3.197
2.632
3.289
3.947
5.263
3.789
4.737
5.684
7.579
5.158
7.737
10.316
6.737
8.421
10.105
13.473
8.526
12.789
17.052
10.526
13.158
15.789
21.052
15.158
18.947
22.736
30.315
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
Maximum Safe Clear Span
1 Ton
3 Ton
5 Ton
H-15
H-20
H-25
0'-7"
0'-8"
0'-9"
0'-10"
1'-0"
1'-2"
1'-1"
1'-4"
1'-7"
2'-1"
1'-6"
2'-2"
1'-10"
2'-4"
2'-9"
3'-6"*
2'-4"
3'-5"
2'-10"
3'-6"
4'-3"
4'-11"*
4'-1"
5'-0"
5'-8"*
6'-6"*
5'-6"
7'-0"*
8'0"*
7'-0"*
7'-9"*
8'-6"*
9'-8"*
8'-4"*
10'-0"*
11'-4"*
9'-8"*
10'-8"*
11'-6"*
13'-0"*
12'-6"*
13'-10"*
14'-10"*
16'-2"*
0'-6"
0'-7"
0'-8"
0'-8"
0'-9"
0'-10"
0'-10"
1'-0"
1'-1"
1'-5"
1'-0"
1'-5"
1'-3"
1'-6"
1'-9"
2'-3"
1'-6"
2'-2"
1'-10"
2'-3"
2'-7"
3'-5"
2'-6"
3'-1"
3'-8"
4'-9"
3'-4"
4'-10"
6'-0"*
4'-3"
5'-3"
6'-3"
7'-6"*
5'-4"
7'-8"*
8'-11"*
6'-6"
8'-1"
9'-0"*
10'-4"*
9'-4"
10'-10"*
11'-8"*
13'-6"*
0'-7"
0'-8"
0'-9"
0'-9"
0'-11"
1'-0"
0'-11"
1'-1"
1'-2"
1'-6"
1'-2"
1'-6"
1'-4"
1'-7"
1'-10"
2'-3"
1'-7"
2'-2"
1'-7"
2'-3"
2'-7"
3'-4"
2'-6"
3'-0"
3'-7"
4'-7"
3'-3"
4'-8"
6'-0"*
4'-2"
5'-1"
6'-0"
7'-4"*
5'-1"
7'-6"
8'-7"*
6'-3"
7'-8"
8'-9"*
10'-0"*
8'-9"*
10'-5"*
11'-4"*
12'-11"*
0'-9"
0'-10"
0'-11"
1'-0"
1'-1"
1'-2"
1'-2"
1'-4"
1'-6"
1'-9"
1'-5"
1'-9"
1'-8"
1'-11"
2'-2"
2'-8"
2'-3"
2'-7"
1'-11"
2'-7"
3'-0"
3'-10"
2'-11"
3'-6"
4'-1"
5'-1"*
3'-9"
5'-4"
6'-4"*
4'-9"
5'-10"
6'-8"*
7'-8"*
5'-10"
7'-11"*
9'-1"*
7'-1"
8'-6"*
9'-3"*
10'-7"*
10'-0"
11'-0"*
12'-0"*
13'-9"*
0'-11"
1'-0"
1'-1"
1'-1"
1'-3"
1'-4"
1'-4"
1'-6"
1'-8"
1'-11"
1'-7"
2'-0"
1'-11"
2'-1"
2'-4"
2'-10"
2'-1"
2'-9"
2'-4"
2'-9"
3'-2"
3'-11"*
3'-1"
3'-8"
4'-2"
5'-1"*
3'-11"
5'-5"
6'-3"*
4'-10"
5'-10"
6'-7"*
7'-7"*
5'-11"
7'-10"*
9'-0"*
7'-1"
8'-4"*
9'-2"*
10'-8"*
9'-9"*
10'-7"*
11-10"*
13'-5"*
0'-11"
1'-0"
1'-2"
1'-2"
1'-4"
1'-5"
1'-5"
1'-7"
1'-9"
2'-0"
1'-8"
2'-0"
1'-11"
2'-2"
2'-4"
2'-10"
2'-2"
2'-9"
2'-5"
2'-10"
3'-2"
3'-11"*
3'-1"
3'-8"
4'-3"
5'-0"
3'-11"
5'-5"
6'-3'*
4'-10"
5'-10"
6'-7"*
7'-6"*
5'-11"
7'-9"*
9'-1"*
7'-1"
8'-4"*
9'-0"*
10'-4"*
9'-8"
10'-10"*
11'-8"*
13'-4"*
Weights are approximate, and can var y depending on panel width, type of cross bar, and mill and fabrication tolerances.
Weights shown are based on 4" cross bar centers.
Section Modulus based on 10.105 bars/foot.
*Span limited by deflection (L/400 maximum).
For serrated grating design, increase bearing bar depth to next deeper size shown in char t.
10
Load Table for Heavy-Duty Bar Grating Type 22W4 – Simple Spans
1-3
/8
1-3
"
CL
CL
/8
"
CL
CL
CL
CL
4"
CL
2"
CL
22W4
22W2
NOTE: The design capacity of any product shown is the same regardless of cross bar spacing.
Bar
Size
Weight
#/SF
Section
Modulus
per foot
width
Standard
Cross Bar
1 x 1/4"
1 x 5/16"
1 x 3/8"
1-1/4 x 1/4"
1-1/4 x 5/16"
1-1/4 x 3/8"
1-1/2 x 1/4"
1-1/2 x 5/16"
1-1/2 x 3/8"
1-1/2 x 1/2"
1-3/4 x 1/4"
1-3/4 x 3/8"
2 x 1/4"
2 x 5/16"
2 x 3/8"
2 x 1/2"
2-1/4 x 1/4"
2-1/4 x 3/8"
2-1/2 x 1/4"
2-1/2 x 5/16"
2-1/2 x 3/8"
2-1/2 x 1/2"
3 x 1/4"
3 x 5/16"
3 x 3/8"
3 x 1/2"
3-1/2 x 1/4"
3-1/2 x 3/8"
3-1/2 x 1/2"
4 x 1/4"
4 x 5/16"
4 x 3/8"
4 x 1/2"
4-1/2 x 1/4"
4-1/2 x 3/8"
4-1/2 x 1/2"
5 x 1/4"
5 x 5/16"
5 x 3/8"
5 x 1/2"
6 x 1/4"
6 x 5/16"
6 x 3/8"
6 x 1/2"
8.8
10.7
12.6
10.7
13.1
15.5
12.6
15.5
18.3
24.1
14.5
21.2
16.4
20.2
24.1
31.7
18.3
26.9
20.2
25
29.8
39.4
24.1
29.8
36.4
47.9
27.9
42.2
55.6
31.7
40.2
47.9
63.2
36.4
53.6
70.9
40.2
49.8
59.4
78.5
47.9
59.4
70.9
93.8
0.364
0.455
0.545
0.568
0.710
0.852
0.818
1.023
1.227
1.636
1.114
1.670
1.455
1.818
2.182
2.909
1.841
2.761
2.273
2.841
3.409
4.545
3.273
4.091
4.909
6.545
4.454
6.682
8.909
5.818
7.273
8.727
11.636
7.363
11.045
14.727
9.091
11.363
13.636
18.181
13.091
16.363
19.636
26.181
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
Maximum Safe Clear Span
1 Ton
3 Ton
5 Ton
H-15
H-20
H-25
0'-6"
0'-8"
0'-9"
0'-9"
0"-11"
1'-1"
1'-0"
1'-3"
1'-6"
1'-11"
1'-4"
1'-11"
1'-9"
2'-1"
2'-6"
3'-4"
2'-2"
3'-2"
2'-7"
3'-3"
3'-10"
4'-9"*
3'-9"
4'-7"
5'-4"*
6'-2"*
5'-0"
6'-10"*
7'-8"*
6'-6"
7'-5"*
8'-2"*
9'-4"*
7'-11"*
9'-8"*
10'-11"*
9'-3"*
10'-3"*
11'-2"*
12'-6"*
12'-0"*
13'-4"*
14'-4"*
15'-10"
0'-6"
0'-6"
0'-7"
0'-7"
0'-8"
0'-9"
0'-9"
0'-11"
1'-0"
1'-3"
0'-11"
1'-3"
1'-2"
1'-5"
1'-7"
2'-1"
1'-5"
2'-0"
1'-8"
2'-0"
2'-4"
3'-1"
2'-3"
2'-9"
3'-4"
4'-4"
3'-0"
4'-5"
5'-9"
3'-10"
4'-9"
5'-8"
7'-1"*
4'-10"
7'-1"
8'-6"*
5'-11"
7'-4"
8'-7"
9'-10"*
8'-5"
10'-5"
11'-2"*
12'-10"*
0'-7"
0'-8"
0'-9"
0'-9"
0'-10"
0'-11"
0'-11"
1'-0"
1'-1"
1'-4"
1'-1"
1'-4"
1'-3"
1'-5"
1'-8"
2'-1"
1'-6"
2'-0"
1'-8"
2'-0"
2'-4"
3'-0"
2'-3"
2'-9"
3'-2"
4'-2"
2'-11"
4'-2"
5'-6"
3'-9"
4'-6"
5'-4"
6'-10"*
4'-7"
6'-8"
8'-1"*
5'-7"
6'-10"
8'-2"
9'-5"*
7'-10"
9'-8"
10'-8"*
12'-2"*
0'-9"
0'-10"
0'-11"
0'-11"
1'-0"
1'-2"
1'-1"
1'-3"
1'-4"
1'-7"
1'-3"
1'-8"
1'-6"
1'-9"
2'-0"
2'-5"
1'-9"
2'-4"
2'-0"
2'-5"
2'-9"
3'-6"
2'-8"
3'-2"
3'-8"
4'-9"
3'-5"
4'-10"
6'-0"*
4'-3"
5'-2"
6'-1"
7'-3"*
5'-3"
7'-6"*
8'7"*
6'-4"
7'-9"
8'-9"*
10'-0"*
8'-10"
10'-5"*
11'-4"*
12'-10"*
0'-10"
0'-11"
1'-0"
1'-0"
1'-2"
1'-3"
1'-3"
1'-5"
1'-6"
1'-9"
1'-6"
1'-10"
1'-8"
1'-11"
2'-1"
2'-7"
1'-11"
2'-6"
2'-2"
2'-6"
2'-10"
3'-7"
2'-9"
3'-3"
3'-9"
4'-9"*
3'-6"
4'-10"
5'-11"*
4'-4"
5'-3"
6'-1"
7'-1"*
5'-3"
7'-4"*
8'-5"*
6'-4"
8'-8"*
8'-7"*
9'-10"*
8'-9"
10'-2"*
11'-2"*
12'-8"*
0'-10"
1'-0"
1'-1"
1'-1"
1'-3"
1'-4"
1'-4"
1'-6"
1'-7"
1'-10"
1'-6"
1'-11"
1'-9"
2'-0"
2'-2"
2'-7"
2'-0"
2'-6"
2'-3"
2'-7"
2'-11"
3'-7"
2'-10"
3'-4"
3'-10"
4'-9"
3'-6"
4'-10"
5'-10"*
4'-4"
5'-2"
6'-1"
7'-0"*
5'-3"
7'-4"
8'-4"*
6'-3"
7'-8"
8'-6"*
9'-9"*
8'-8"
10'-2"*
11'-0'*
12'-6"*
Weights are approximate, and can var y depending on panel width, type of cross bar, and mill and fabrication tolerances.
Weights shown are based on 4" cross bar centers.
Section Modulus based on 8.727 bars/foot.
*Span limited by deflection (L/400 maximum).
For serrated grating design, increase bearing bar depth to next deeper size shown in chart.
11
Load Table for Heavy-Duty Bar Grating Type 30W4 – Simple Spans
1-7
/8
1-7
"
CL
CL
/8
"
CL
CL
CL
CL
CL
4"
CL
2"
30W4
30W2
NOTE: The design capacity of any product shown is the same regardless of cross bar spacing.
Bar
Size
1 x 1/4"
1 x 5/16"
1 x 3/8"
1-1/4 x 1/4"
1-1/4 x 5/16"
1-1/4 x 3/8"
1-1/2 x 1/4"
1-1/2 x 5/16"
1-1/2 x 3/8"
1-1/2 x 1/2"
1-3/4 x 1/4"
1-3/4 x 3/8"
2 x 1/4"
2 x 5/16"
2 x 3/8"
2 x 1/2"
2-1/4 x 1/4"
2-1/4 x 3/8"
2-1/2 x 1/4"
2-1/2 x 5/16"
2-1/2 x 3/8"
2-1/2 x 1/2"
3 x 1/4"
3 x 5/16"
3 x 3/8"
3 x 1/2"
3-1/2 x 1/4"
3-1/2 x 3/8"
3-1/2 x 1/2"
4 x 1/4"
4 x 5/16"
4 x 3/8"
4 x 1/2"
4-1/2 x 1/4"
4-1/2 x 3/8"
4-1/2 x 1/2"
5 x 1/4"
5 x 5/16"
5 x 3/8"
5 x 1/2"
6 x 1/4"
6 x 5/16"
6 x 3/8"
6 x 1/2"
Weight
#/SF
6.9
8.3
9.8
8.3
10.2
12
9.8
12
14.1
18.4
11.2
16.3
12.7
15.6
18.5
24.2
14.1
20.6
15.6
19.2
22.8
30.0
18.5
22.8
28.0
36.7
21.4
32.3
42.5
24.2
30.9
36.7
48.2
28.0
41.0
54.0
30.9
38.1
45.4
59.8
36.7
45.4
54.0
71.4
Section
Modulus
per foot
width
0.267
0.333
0.40
0.417
0.521
0.625
0.60
0.750
0.90
1.20
0.817
1.225
1.067
1.333
1.60
2.133
1.350
2.025
1.667
2.083
2.50
3.333
2.40
3.0
3.60
4.80
3.267
4.90
6.533
4.267
5.333
6.40
8.533
5.40
8.10
10.80
6.667
8.333
10.0
13.33
9.60
12.0
14.40
19.20
Standard
Cross Bar
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
Maximum Safe Clear Span
1 Ton
3 Ton
5 Ton
H-15
H-20
H-25
0'-6"
0'-7"
0'-8"
0'-8"
0'-9"
0'-11"
0'-11"
1'-1"
1'-3"
1'-8"
1'-2"
1'-8"
1'-6"
1'-10"
2'-2"
2'-10"
1'-10"
2'-10"
2'-3"
2'-9"
3'-3"
4'-4"
3'-2"
3'-11"
4'-8"
5'-8"*
4'-3"
6'-2"*
7'-2"*
5'-6"
6'-10"
7'-6"*
8'-7"*
6'-11"
8'-10"*
10'-2"*
8'-6"
9'-6"*
10'-4"*
11'-9"*
11'-2"*
12'-4"*
13'-3"*
15'-0"*
0'-5"
0'-6"
0'-6"
0'-6"
0'-7"
0'-8"
0'-8"
0'-9"
0'-10"
1'-1"
0'-10"
1'-1"
1'-0"
1'-2"
1'-4"
1'-9"
1'-2"
1'-8"
1'-5"
1'-8"
2'-0"
2'-6"
1'-9"
2'-4"
2'-9"
3'-6"
2'-6"
3'-5"
4'-9"
3'-2"
3'-11"
4'-8"
6'-1"
3'-11"
5'-10"
7'-8"
4'-10"
5'-11"
7'-1"
8'-11"*
6'-10"
8'-6"
10'-1"
11'-8"*
0'-6"
0'-7"
0'-8"
0'-8"
0'-9"
0'-10"
0'-9"
0'-11"
1'-0"
1'-2"
0'-11"
1'-2"
1'-1"
1'-3"
1'-5"
1'-9"
1'-3'
1'-8"
1'-5"
1'-8"
1'-11"
2'-5"
1'-11'
2'-3"
2'-7"
3'-4"
2'-5"
3'-5"
4'-5"
3'-0"
3'-8"
4'-4"
5'-7"
3'-8"
5'-4"
7'-0"
4'-6"
5'-6"
6'-6"
8'-5"
6'-3"
7'-9"
9'-2"
11'-0"*
0'-8"
0'-9"
0'-9"
0'-10"
0'-11"
1'-0"
1'-0"
1'-1"
1'-2"
1'-5"
1'-2"
1'-5"
1'-4"
1'-6"
1'-8"
2'-0"
1'-6"
1'-11"
1'-8"
2'-0"
2'-3"
2'-10"
2'-2"
2'-7"
3'-0"
3'-9"
2'-9"
3'-10"
4'-11"
3'-5"
4'-2"
4'-10"
6'-3"
4'-2"
6'-0"
7'-7"*
5'-0"
6'-2"
7'-3"
8'-10"*
7'-0"
8'-7"
9'-11"*
11'-6"*
0'-9"
0'-10"
0'-11"
0'-11"
1'-0"
1'-1"
1'-1"
1'-3"
1'-4"
1'-7"
1'-3"
1'-7"
1'-6"
1'-8"
1'-10"
2'-2"
1'-8"
2'-1"
1'-10"
2'-1"
2'-5"
2'-11"
2'-4"
2'-8"
3'-1"
3'-10"
2'-10"
3'-11"
4'-11"
3'-6"
4'-2"
4'-10"
6'-2"
4'-3"
5'-11"
7'-5"*
5'-0"
6'-1"
7'-2"
8'-8"*
6'-11"
8'-5"
9'-10"
11'-3"*
0'-9"
0'-10"
0'-11"
0'-11"
1'-1"
1'-2"
1'-2"
1'-3"
1'-5"
1'-7"
1'-4"
1'-8"
1'-6"
1'-9"
1'-11"
2'-2"
1'-9"
2'-2"
1'-11"
2'-2"
2'-5"
2'-11"
2'-4"
2'-9"
3'-1"
3'-10"
2'-11"
3'-11"
4'-11"
3'-6"
4'-2"
4'-10"
6'-2"
4'-3"
5'-10"
7'-4"*
5'-0"
6'-0"
7'-0"
8'-7"*
6'-10"
8'-3"
9'-9"
11'-1"*
Weights are approximate, and can var y depending on panel width, type of cross bar, and mill and fabrication tolerances.
Weights shown are based on 4" cross bar centers.
Section Modulus based on 6.4 bars/foot.
*Span limited by deflection (L/400 maximum).
For serrated grating design, increase bearing bar depth to next deeper size shown in char t.
12
Load Table for Heavy-Duty Bar Grating Type 38W4 – Simple Spans
2-3
2-3
/8
"
CL
CL
CL
4"
CL
/8
"
CL
CL
CL
CL
2"
38W4
38W2
NOTE: The design capacity of any product shown is the same regardless of cross bar spacing.
Bar
Size
1 x 1/4"
1 x 5/16"
1 x 3/8"
1-1/4 x 1/4"
1-1/4 x 5/16"
1-1/4 x 3/8"
1-1/2 x 1/4"
1-1/2 x 5/16"
1-1/2 x 3/8"
1-1/2 x 1/2"
1-3/4 x 1/4"
1-3/4 x 3/8"
2 x 1/4"
2 x 5/16"
2 x 3/8"
2 x 1/2"
2-1/4 x 1/4"
2-1/4 x 3/8"
2-1/2 x 1/4"
2-1/2 x 5/16"
2-1/2 x 3/8"
2-1/2 x 1/2"
3 x 1/4"
3 x 5/16"
3 x 3/8"
3 x 1/2"
3-1/2 x 1/4"
3-1/2 x 3/8"
3-1/2 x 1/2"
4 x 1/4"
4 x 5/16"
4 x 3/8"
4 x 1/2"
4-1/2 x 1/4"
4-1/2 x 3/8"
4-1/2 x 1/2"
5 x 1/4"
5 x 5/16"
5 x 3/8"
5 x 1/2"
6 x 1/4"
6 x 5/16"
6 x 3/8"
6 x 1/2"
Weight
#/SF
5.7
6.8
7.9
6.8
8.2
9.6
7.9
9.6
11.3
14.7
9
13
10.2
12.5
14.7
19.2
11.3
16.4
12.5
15.3
18.1
23.8
14.7
18.1
22.4
29.2
17
25.8
33.7
19.2
24.7
29.2
38.2
22.4
32.6
42.8
24.7
30.3
36
47.3
29.2
36
42.8
56.4
Section
Modulus
per foot
width
0.211
0.263
0.316
0.329
0.411
0.493
0.474
0.592
0.711
0.947
0.645
0.967
0.842
1.053
1.263
1.684
1.066
1.599
1.316
1.645
1.974
2.632
1.895
2.368
2.842
3.790
2.579
3.869
5.158
3.369
4.211
5.053
6.737
4.263
6.395
8.527
5.264
6.579
7.895
10.527
7.580
9.474
11.369
15.159
Standard
Cross Bar
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
3/8" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
1/2" dia
Maximum Safe Clear Span
1 Ton
3 Ton
5 Ton
H-15
H-20
H-25
0'-5"
0'-6"
0'-7"
0'-7"
0'-9"
0'-10"
0'-10"
1'-0"
1'-2"
1'-6"
1'-1"
1'-6"
1'-4"
1'-7"
1'-11"
2'-6"
1'-8"
2'-5"
2'-0"
2'-6"
2'-11"
3'-6"
2'-10"
3'-6"
4'-2"
5'-4"*
3'-9"
5'-7"
6'-9'*
4'-11"
6'-1"
7'-2"*
8'-2"*
6'-2"
8'-5"*
9'-7"*
7'-7"
9'-0"*
9'-10"*
11'-2"*
10'-6"*
11'-8"*
12'-8"*
14'-4"*
0'-5"
0'-5"
0'-6"
0'6"
0'-6"
0'-7"
0'7"
0'-8"
0'-9"
1'-0"
0'9"
1'-0"
0'-11"
1'-0"
1'-2"
1'-6"
1'-1"
1'-5"
1'-3"
1'-6"
1'-9"
2'-3"
1'-8"
2'-0"
2'-5"
3'-1"
2'-2"
3'-2"
4'-1"
2'-9"
3'-5"
4'-0"
5'-4"
3'-5"
5'-0"
6'-8"
4'-2"
5'-2"
6'-2"
8'-2"
5'-11"
7'-4"
8'-9"
10'-10"*
0'-6"
0'-6"
0'-7"
0'-7"
0'-8"
0'-9"
0'-9"
0'-10"
0'-11"
1'-0"
0'-10"
1'-1"
1'-0"
1'-1"
1'-3"
1'-6"
1'-1"
1'-5"
1'-3"
1'-6"
1'-8"
2'-2"
1'-8"
1'-11"
2'-3"
2'-11"
2'-1"
2'-11"
3'-9"
2'-7"
3'-2"
3'-8"
4'-10"
3'-2"
4'-7"
6'-0"
3'-10"
4'-8"
5'-7"
7'-3"
5'-4"
6'-7"
7'-10"
10'-2"*
0'-7"
0'-8"
0'-8"
0'-9"
0'-10"
0'-11"
0'-11"
1'-0"
1'-1"
1'-3"
1'-0"
1'-3"
1'-2"
1'-4"
1'-6"
1'-9"
1'-4"
1'-9"
1'-5"
1'-9"
2'-0"
2'-5"
1'-11"
2'-3"
2'-7"
3'-3"
2'-5"
3'-4"
4'-3"
2'-11"
3'-7"
4'-2"
5'-4"
3'-7"
5'-1"
6'-7"
4'-3"
5'-3"
6'-2"
8'-0"
5'-11"
7'-3"
8'-7"
10'-7"*
0'-8"
0'-9"
0'-10"
0'-10"
0'-11"
1'-0"
1'-0"
1'-1"
1'-3"
1'-5"
1'-2"
1'-5"
1'-4"
1'-6"
1'-8"
1'-11"
1'-6"
1'-10"
1'-8"
1'-11"
2'-1"
2'-6"
2'-1"
2'-4"
2'-10"
3'-4"
2'-6"
3'-4"
4'-2"
3'-0"
3'-7"
4'-2"
5'-3"
3'-7"
5'-0"
6'-5"
4'-3"
5'-2"
6'-0"
7'-9"
5'-10"
7'-1"
8'-4"
10'-3"*
0'-8"
0'-9"
0'-10"
0'-10"
0'-11"
1'-1"
1'-0"
1'-2"
1'-3"
1'-6"
1'-2"
1'-6"
1'-5"
1'-7"
1'-8"
2'-0"
1'-7"
1'-11"
1'-9"
1'-11"
2'-2"
2'-7"
2'-1"
2'-5"
2'-8"
3'-4"
2'-6"
3'-4"
4'-2"
3'-0"
3'-7"
4'-1"
5'-2"
3'-7"
5'-0"
6'-4"
4'-3"
5'-1"
5'-11"
7'-7"
5'-9"
6'-11"
8'-1"
10'-1"*
Weights are approximate, and can var y depending on panel width, type of cross bar, and mill and fabrication tolerances.
Weights shown are based on 4" cross bar centers.
Section Modulus based on 5.053 bars/foot.
*Span limited by deflection (L/400 maximum).
13
Standard Panel Widths for 11W, 15W and 19W Heavy-Duty Grating
Number of
Bearing Bars
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
11W4
15W4
1/4"
5/16"
3/8"
1/4"
5/16"
3/8"
1/4"
5/16"
3/8"
15/16
1 5/8
2 5/16"
3
3 11/16
4 3/8
5 1/16
5 3/4
6 7/16
7 1/8
7 13/16
8 1/2
9 3/16
9 7/8
10 9/16
11 1/4
11 15/16
12 5/8
13 5/16
14
14 11/16
15 3/8
16 1/16
16 3/4
17 7/16
18 1/8
18 13/16
19 1/2
20 3/16
20 7/8
21 9/16
22 1/4
22 15/16
23 5/8
24 5/16
25
25 11/16
26 3/8
27 1/16
27 3/4
28 7/16
29 1/8
29 13/16
30 1/2
31 3/16
31 7/8
32 9/16
33 1/4
1
1 11/16
2 3/8
3 1/16
3 3/4
4 7/16
5 1/8
5 13/16
6 1/2
7 3/16
7 7/8
8 9/16
9 1/4
9 15/16
10 5/8
11 5/16
12
12 11/16
13 3/8
14 1/16
14 3/4
15 7/16
16 1/8
16 13/16
17 1/2
18 3/16
18 7/8
19 9/16
20 1/4
20 15/16
21 5/8
22 5/16
23
23 11/16
24 3/8
25 1/16
25 3/4
26 7/16
27 1/8
27 13/16
28 1/2
29 3/16
29 7/8
30 9/16
31 1/4
31 15/16
32 5/8
33 5/16
1 1/16
1 3/4
2 7/16
3 1/8
3 13/16
4 1/2
5 3/16
5 7/8
6 9/16
7 1/4
7 15/16
8 5/8
9 5/16
10
10 11/16"
11 3/8
12 1/16
12 3/4
13 7/16
14 1/8
14 13/16
15 1/2
16 3/16
16 7/8
17 9/16
18 1/4
18 15/16
19 5/8
20 5/16
21
21 11/16
22 3/8
23 1/16
23 3/4
24 7/16
25 1/8
25 13/16
26 1/2
27 3/16
27 7/8
28 9/16
29 1/4
29 15/16
30 5/8
31 5/16
32
32 11/16"
33 3/8
1 3/16
2 1/8
3 1/16
4
4 15/16
5 7/8
6 13/16
7 3/4
8 11/16
9 5/8
10 9/16
11 1/2
12 7/16
13 3/8
14 5/16
15 1/4
16 3/16
17 1/8
18 1/16
19
19 15/16
20 7/8
21 13/16
22 3/4
23 11/16
24 5/8
25 9/16
26 1/2
27 7/16
28 3/8
29 5/16
30 1/4
31 3/16
32 1/8
33 1/16
34
34 15/16
35 7/8
36 13/16
37 3/4
38 11/16"
39 5/8
40 9/16
41 1/2
42 7/16
43 3/8
44 5/16
45 1/4
1 1/4
2 3/16
3 1/8
4 1/16
5
5 15/16
6 7/8
7 13/16
8 3/4
9 11/16
10 5/8
11 9/16
12 1/2
13 7/16
14 3/8
15 5/16
16 1/4
17 3/16
18 1/8
19 1/16
20
20 15/16
21 7/8
22 13/16
23 3/4
24 11/16
25 5/8
26 9/16
27 1/2
28 7/16
29 3/8
30 5/16
31 1/4
32 3/16
33 1/8
34 1/16
35
35 15/16
36 7/8
37 13/16
38 3/4
39 11/16
40 5/8
41 9/16
42 1/2
43 7/16
44 3/8
45 5/16
1 5/16
2 1/4
3 3/16
4 1/8
5 1/16
6
6 15/16
7 7/8
8 13/16
9 3/4
10 11/16
11 5/8
12 9/16
13 1/2
14 7/16
15 3/8
16 5/16
17 1/4
18 3/16
19 1/8
20 1/16
21
21 15/16
22 7/8
23 13/16
24 3/4
25 11/16
26 5/8
27 9/16
28 1/2
29 7/16
30 3/8
31 5/16
32 1/4
33 3/16
34 1/8
35 1/16"
36
36 15/16
37 7/8
38 13/16
39 3/4
40 11/16
41 5/8
42 9/16
43 1/2
44 7/16
45 3/8
1 7/16
2 5/8
3 13/16
5
6 3/16
7 3/8
8 9/16
9 3/4
10 15/16
12 1/8
13 5/16
14 1/2
15 11/16"
16 7/8
18 1/16"
19 1/4
20 7/16
21 5/8
22 13/16
24
25 3/16
26 3/8
27 9/16
28 3/4
29 15/16
31 1/8
32 5/16
33 1/2
34 11/16"
35 7/8
37 1/16
38 1/4
39 7/16
40 5/8
41 13/16
43
44 3/16
45 3/8
46 9/16
47 3/4
48 15/16
50 1/8
51 5/16
52 1/2
53 11/16
54 7/8
56 1/16
57 1/4
1 1/2
2 11/16
3 7/8
5 1/16"
6 1/4
7 7/16
8 5/8
9 13/16
11
12 3/16
13 3/8
14 9/16
15 3/4
16 15/16
18 1/8
19 5/16
20 1/2
21 11/16
22 7/8
24 1/16
25 1/4
26 7/16
27 5/8
28 13/16
30
31 3/16
32 3/8
33 9/16
34 3/4
35 15/16
37 1/8
38 5/16
39 1/2
40 11/16
41 7/8
43 1/16
44 1/4
45 7/16
46 5/8
47 13/16
49
50 3/16
51 3/8
52 9/16
53 3/4
54 15/16
56 1/8
57 5/16
1 9/16"
2 3/4
3 15/16
5 1/8
6 5/16
7 1/2
8 11/16
9 7/8
11 1/16"
12 1/4
13 7/16
14 5/8
15 13/16
17
18 3/16
19 3/8
20 9/16
21 3/4
22 15/16
24 1/8
25 5/16
26 1/2
27 11/16"
28 7/8
30 1/16
31 1/4
32 7/16
33 5/8
34 13/16
36
37 3/16
38 3/8
39 9/16
40 3/4
41 15/16
43 1/8
44 5/16
45 1/2
46 11/16
47 7/8
49 1/16
50 1/4
51 7/16
52 5/8
53 13/16
55
56 3/16
57 3/8
Nominal 2' and 3' widths highlighted.
Wider panels possible if application requires. Please contact Laurel Steel for additional information.
14
19W4
Standard Panel Widths for 22W, 30W and 38W Heavy-Duty Grating
Number of
Bearing Bars
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
22W4
30W4
38W4
1/4"
5/16"
3/8"
1/4"
5/16"
3/8"
1/4"
5/16"
3/8"
1 5/8
3
4 3/8
5 3/4
7 1/8
8 1/2
9 7/8
11 1/4
12 5/8
14
15 3/8
16 3/4
18 1/8
19 1/2
20 7/8
22 1/4
23 5/8
25
26 3/8
27 3/4
29 1/8
30 1/2
31 7/8
33 1/4
34 5/8
36
37 3/8
38 3/4
40 1/8
41 1/2
42 7/8
44 1/4
45 5/8
47
48 3/8
49 3/4
51 1/8
52 1/2
53 7/8
55 1/4
56 5/8
58
59 3/8
60 3/4
62 1/8
63 1/2
64 7/8
66 1/4
1 11/16
3 1/16
4 7/16
5 13/16
7 13/16
8 9/16
9 15/16
11 5/16
12 11/16
14 1/16
15 7/16
16 13/16
18 3/16"
19 9/16
20 15/16
22 5/16
23 11/16
25 1/16
26 7/16
27 13/16
29 3/16
30 9/16
31 15/16
33 5/16
34 11/16
36 1/16"
37 7/16
38 13/16
40 3/16
41 9/16
42 15/16
44 5/16
45 11/16
47 1/16
48 7/16
49 13/16
51 3/16
52 9/16
53 15/16
55 5/16
56 11/16
58 1/16
59 7/16
60 13/16
62 3/16
63 9/16
64 15/16
66 5/16
1 3/4
3 1/8
4 1/2
5 7/8
7 1/4
8 5/8
10
11 3/8
12 3/4
14 1/8
15 1/2
16 7/8
18 1/4
19 5/8
21
22 3/8
23 3/4
25 1/8
26 1/2
27 7/8
29 1/4
30 5/8
32
33 3/8
34 3/4
36 1/8
37 1/2
38 7/8
40 1/4
41 5/8
43
44 3/8
45 3/4
47 1/8
48 1/2
49 7/8
51 1/4
52 5/8
54
55 3/8
56 3/4
58 1/8
59 1/2
60 7/8
62 1/4
62 5/8
65
66 3/8
2 1/8
4
5 7/8
7 3/4
9 5/8
11 1/2
13 3/8
15 1/4
17 1/8
19
20 7/8
22 3/4
24 5/8
26 1/2
28 3/8
30 1/4
32 1/8
34
35 7/8
37 3/4
39 5/8
41 1/2
43 3/8
45 1/4
47 1/8
49
50 7/8
52 3/4
54 5/8
56 1/2
58 3/8
60 1/4
62 1/8
64
65 7/8
67 3/4
69 5/8
71 1/2
2 3/16
4 1/16
5 15/16
7 13/16
9 11/16
11 9/16
13 7/16
15 5/16
17 3/16
19 1/16
20 15/16
22 13/16
24 11/16
26 9/16
28 7/16
30 5/16
32 3/16
34 1/16"
35 15/16
37 13/16
39 11/16
41 9/16
43 7/16
45 5/16
47 3/16
49 1/16
50 15/16
52 13/16
54 11/16
56 9/16
58 7/16
60 5/16
62 3/16
64 1/16
65 15/16
67 13/16
69 11/16
71 9/16
2 1/4
4 1/8
6
7 7/8
9 3/4
11 5/8
13 1/2
15 3/8
17 1/4
19 1/8
21
22 7/8
24 3/4
26 5/8
28 1/2
30 3/8
32 1/4
34 1/8
36
37 7/8
39 3/4
41 5/8
43 1/2
45 3/8
47 1/4
49 1/8
51
52 7/8
54 3/4
56 5/8
58 1/2
60 3/8
62 1/4
64 1/8
66
67 7/8
69 3/4
71 5/8
2 5/8
5
7 3/8
9 3/4
12 1/8
14 1/2
16 7/8
19 1/4
21 5/8
24
26 3/8
28 3/4
31 1/8
33 1/2
35 7/8
38 1/4
40 5/8
43
45 3/8
47 3/4
50 1/8
52 1/2
54 7/8
57 1/4
59 5/8
62
64 3/8
66 3/4
69 1/8
71 1/2
2 11/16
5 1/16
7 7/16
9 13/16
12 3/16
14 9/16
16 15/16
19 5/16
21 11/16
24 1/16
26 7/16
28 13/16
31 3/16
33 9/16
35 15/16
38 5/16
40 11/16
43 1/16
45 7/16
47 13/16
50 3/16
52 9/16
54 15/16
57 5/16
59 11/16
62 1/16
64 7/16
66 13/16
69 1/5
71 9/16
2 3/4
5 1/8
7 1/2
9 7/8
12 1/4
14 5/8
17
19 3/8
21 3/4
24 1/8
26 1/2
28 7/8
31 1/4
33 5/8
36
38 3/8
40 3/4
43 1/8
45 1/2
47 7/8
50 1/4
52 5/8
55
57 3/8
59 3/4
62 1/8
64 1/2
66 7/8
69 1/4
71 5/8
Nominal 2' and 3' widths highlighted.
Wider panels possible if application requires. Please contact Laurel Steel for additional information.
15
Laurel Steel Heavy-Duty Steel Grating
Fabrication Tolerances
All Laurel Steel Gratings are produced in accordance with
manufacturing tolerances as set forth by NAAMM.
WIDTH (W) overall ± 1/4"
1/8"
o.c. ± 1/16"
1/8"
1/8"
(measured on
top of grating)
3/
8"
12
±
Cross bar
shall not var y
more than 1/8
in 12 in either
direction from
perpendicular
alignment with
bearing bars.
SPAN (S) ± 1/4"
D'
=
D
D
± 1/4" c-c end cross bars in 5'-0" length
D and D' are
overall diagonal
dimensions.
cross bar alignment and spacing
1/8"
W and W' are
overall lengths
of cross bars at
opposite ends
of panel.
W' = W ± 1/4"
cross bars
bearing bars
overall dimensions and squareness
bearing bar lean
cross bar location
12
12
cross bar lean
1 1/4
2 1/2
1/8" per foot of width
bearing bars
1/8" per foot of width
transverse bow
(before fastening to supports)
bearing bars
1/240 of span
longitudinal bow
16
(before fastening to supports)
Laurel Steel Heavy-Duty Steel Grating
Installation Tolerances
Further, it is recommended that those responsible for erecting
Laurel Heavy-Duty Steel Grating observe the standard installation
clearances as detailed below.
Standard Installation Clearances
SPAN
1/4"
1/4"
(direction of bearing bars)
panel span
bearing
bars
bearing
bars
panel width
panel span
1/4"
1/4"
panel width
bearing
bars
bearing
bars
3/8" clearance
between ends
of cross bars.
*
*
3/8"
bearing
bars
bearing
bars
min. clearance
equal to
suppor t angle
fillet radius
1/2"
bearing
bars
Clearances shall be as shown, but shall be permitted to vary in
bearing
bars
accordance with dimensional tolerances shown on previous page.
Heavy-duty grating shall be designed to have structural support under
each bearing bar at cut-outs.
*This dimension varies due to bearing bar spacing.
Definition of Effective Spans
L
trench
W
.25
W
.5W
L
L
L + .5W
L+W
center-to-center beams
back-to-back channels
The Effective Clear Span for common suppor t conditions is defined as ‘L’ in these three sketches.
17
Laurel Steel Heavy-Duty Steel Grating
Anchoring Details
All grating shall be anchored firmly to their supports by positive
When bolted, standard grating saddle clips are available for 22W,
means. The most common methods of anchoring the grating are
30W and 38W spacings, up to 3/8" thick bearing bars. Bolting
welding and bolting: the application and/or size of grating shall
grating to supports can also be accomplished by shop welding
determine the size and pattern of welds or bolts.
slotted hold-down plates into the grating.
welds in middle
of panel at each
intermediate suppor t
1
Welded Anchorage
(shall be performed by installing activity)
Size and pattern of welds shall be
determined by application and/or size
of grating. Minimum pattern shall be
as shown.
Additional welding to supports required
for vehicular traffic shall be considered
by the engineer.
welds at ends of
bearing bars each
side of panel
bearing bars
2
Weld Lugs
The designer shall specify when weld
lugs are to be provided by the grating
manufacturer. When provided, weld lugs
shall be 1/4 in. minimum thickness.
Size and pattern of bolts or studs shall
be determined by application and/or size
of grating. Minimum pattern shall be as
shown in welded anchorage (above).
Grating panels shall be used as a template
by installing activity to locate holes or studs
end band
on structural supports.
Bolts, studs and miscellaneous hardware are not
supplied by the grating manufacturer.
3/16"
bearing bars
3
Saddle Clips
Available for 22W, 30W and 38W grating
up to 3/8" BB thickness.
Used for installations where grating is
subject to removal. Will be in same location
as welds in 1 unless otherwise specified.
18
Clips are available from
grating manufacturer. Other
fastening accessories are
available upon request.
Laurel Steel Heavy-Duty Steel Grating
Banding
Laurel Steel adheres to the following NAAMM standards for the
various methods of banding heavy-duty grating, and the welding
provisions indicated.
Minimum thickness = 1/4 in.
see welding detail
For standard banding, band bar shall be same depth as bearing bars.
at each bearing bar for
load-carr ying bands
5" ± o.c. for trim bands
and trench gratings
see welding detail
band
band
bearing bars
standard trim band
bearing bars
load banding (shall be specified)
For trench grating, banding bar may be 1/4 in. to 1/2 in. less than
depth of grating to permit drainage. Full depth band shall be supplied
by manufacturer for all banded grating unless owner or specifier
states clearly that shallow banding shall be provided.
see above
band
3/16"
For depth less than 2-1/2
in. weld one side at top.
3/4"
band
band
3/16"
3/4"
see above
For depth 2-1/2 in. or
greater, weld one side at
top, opposite side at bottom; or weld exceeding
one-half depth on one
side only.
welding detail
Banding heavy-duty metal bar gratings at panel ends and cut-outs
For heavy, high speed or multi-directional traffic, load carrying
improves durability while enhancing appearance. By increasing
banding shall be designed for the effects of impact and fatigue.
transverse stiffness, banding distributes and absorbs impact at the pri-
Structural support shall be provided for all cut-outs accessible to
mary point of contact. Where light vehicular traffic flow is parallel to the
vehicular traffic.
bearing bars, standard banding is sufficient.
Recommended Bearing
A 1" minimum bearing surface shall be provided for bearing bar
depths up to 2-1/4", and 2" minimum bearing surface shall be
provided for depths of 2-1/2" and over at each end of span.
19
Ordering A Laurel Steel Heavy-Duty Steel Grating
Area: to be covered with grating
In order to obtain a quotation or place an order for Laurel
Steel HD grating, it is necessary to provide information for
Span: direction of bearing bars
each of the categories listed below. Please refer to pages 4
and 5 for explanation.
Banding Requirements
Bearing bar: Size, material, spacing, surface
Call or fax your inquiry to our sales department, or you can submit an
Cross bar:
inquiry by contacting our website (www.mlpsteel.com). The sketch
Either 2" or 4" spacing. Please specify standard,
round, or rectangular; specify surface if rectangular.
shown here also appears on our website, with drop-down menus to
make it easy to submit an inquiry or order.
Finish:
Common grating finishes are mill finish (as
fabricated), shop-applied black paint, and hot dip
galvanized coating. Please contact Laurel Steel to
request any special coating requirements.
Sample Specification:
Grating shall be Laurel Steel Heavy-Duty Type 22W4, with 3 x 3/8"
AASHTO H-20 design truck on the specified span. Grating shall
bearing bars spaced 1-3/8" c/c, and 1/2" diameter cross bar
be hot-dipped galvanized after fabrication, in accordance with
spaced 4" c/c. All material shall be ASTM A-36. All bearing
ASTM A-123.
bar/cross bar intersections shall be plug-welded. The ends of all
Grating shall be supplied in conformance with Standard
grating panels shall be trim banded.
Specifications and Code of Practice as provided for in National
Sufficient grating shall be supplied to cover an area 36'-0" wide x
Association of Architectural Metal Manufacturers (NAAMM) Heavy-
3’-8" span. The Laurel Steel Heavy-Duty Grating can support the
Duty Metal Bar Grating Manual MMBG 532-00.
SERRATED RECTANGULAR
CROSS BAR
SERRATED BEARING BAR
SMOOTH BEARING BAR
G
IN
AC
AN
SP
AR
SB
CL
SP
CL
OS
CR
BE
AR
CL
IN
G
CL
BA
R
SP
AC
IN
G
SPECIFY BEARING
BAR HEIGHT &
THICKNESS
SPECIFY HEIGHT & THICKNESS
OF RECTANGULAR CROSS BAR
SMOOTH RECTANGULAR CROSS BAR
WI
DT
H
SPECIFY Ø OF
ROUND CROSS BAR
BAND BAR (OPTIONAL)
20
Americans With Disabilities Act (ADA) and Close Mesh Grating
The federal Americans with Disability Act (ADA) requires that any
In addition to complying with ADA requirements, these heavy-duty
grating installed in a walking area used as an egress to and from a
designs have the added benefit of being able to support highway
building, or in an area inside a building that is a public passageway,
wheel loads, where a grating installation may experience an
must have a maximum clear opening between bearing bars of 1/2".
occasional truck. A load chart giving maximum span capabilities for
H-20 wheel loads is given below, showing examples of each design:
Laurel Steel has standard assembly fixtures that enable it to comply
with this 1/2" opening requirement:
Type 12W4 Grating with 1/4" thick Bearing Bars; and
Type 14W4 Grating with 3/8" thick Bearing Bars
14W4 or 14W2
Bar Size
1 x 3/8"
1 -1/4 x 3/8"
1-1/2 x 3/8"
1-3/4 x 3/8"
2 x 3/8"
2-1/4 x 3/8"
2-/1/2 x 3/8"
3 x 3/8"
12W4 or 12W2
Weight
#SF
Section Modulus
Per foot width
Max. H-20 Span
Bar Size
Weight
#/SF
18.6
23.0
27.35
31.7
36.1
40.5
44.8
54.46
0.857
1.339
1.929
2.625
3.429
4.339
5.357
7.714
1'-4"
1'-7"
1'-11"
2'-4"
2'-9"
3'-4"
3'-11"*
5'-0"*
1 x 14"
1-1/4 x 1/4"
1-1/2 x 1/4"
1-3/4 x 1/4"
2 x 1/4"
2-1/4 x 1/4"
2-1/2 x 1/4"
3 x 1/4"
14.7
18.1
21.5
24.9
28.3
31.7
35.1
41.9
Section Modulus
Max. H-20 Span
Per foot width
0.667
1.042
1.50
2.042
2.667
3.375
4.167
6.00
1'2"
1'5"
1'-8"
2'-0"
2'-4"
2'-9"
3'-2"
4'-3"
Weights are approximate and can var y depending on panel width, type of cross bar, and mill and fabrication tolerances.
Weights shown are for 4" cross bar centers.
Section Modulus based on 13.71 bars/foot of width (14W) and 16.0 bars/foot of width (12W).
*Span limited by deflection (L/400 maximum).
For serrated grating design, increase bearing bar depth to next deeper size shown in char t.
Close Mesh
Laurel Steel also fabricates grating with a 1/4" opening, which
is ideally suited for high volume pedestrian traffic areas, and
where it is necessary to ensure that high heeled shoes don't
get caught in the grating bars. Again, Laurel Steel has standard assembly fixtures — either a Type 7W grating with 3/16"
thick bearing bars, or a Type 8W grating with 1/4" bars — to
satisfy these exacting requirements.
21
Special Fabrications
Laurel Steel welcomes the opportunity to utilize its basic
metalworking equipment, fabrication experience and certified welders
to fabricate one-of-a-kind hopper covers, grizzlies or egg crates that
are specially designed for use in a variety of heavy industries.
Egg Crates
Egg crates are constructed using equal size bearing bars and cross
bars. A notch is punched into the top half of the bearing bar; a similar notch is punched into the bottom half of the cross bar. When
assembled and welded (generally using a full depth fillet weld in
opposite corner of the bb/cb joint), a grating with equal strength in
both directions is produced. Due to equipment restrictions, not all
bar sizes can be used to construct an egg crate. Please contact
Laurel Steel with specific requirements.
Grizzlies
There are practically no restrictions on what bar sizes can be used
to construct a grating commonly referred to as a grizzly. Grizzlies use
solid bearing bars (no notching); cross bars are essentially spacer
blocks welded at 90 degrees to the bearing bars. These weldments
generally require wide spaces between bars. Hence, extremely heavy
bar sizes (up to 12" x 1", for example) are typically used, and bb/cb
joints are generally welded in all four corners.
Supplementary Bar Grating
11
Laurel Steel offers a special fabrication that combines heavy
CL
4"
and light bearing bars to produce a product with unique capabilities.
Deep heavy-duty bars provide the strength to support vehicle loads;
these deeper bars are alternated with lighter, shallower bars that
serve to reduce the grating’s clear opening. This is an extremely
economical solution for certain demanding applications. Call for
additional details.
22
CL
/1
CL
6"
CL
Roadway Inlets and Frames
The design versatility and short fabrication
response inherent in hand made Laurel Steel
Heavy-Duty Grating is perfectly suited for the
roadway inlet grating market. Heavy and
Highway contractors have come to rely on
Laurel Steel for a wide variety of both grating
and related fabricated steel items.
Laurel utilizes robotic technology to maintain
its competitive edge in inlet grates. Precise,
high capacity presses, automated feed lines
and robotic welding capabilities combine to
provide our customers with consistent, reliable quality at the lowest possible price. In
its home state, Pennsylvania, Laurel Steel is
approved to supply all SECTION 605.2(a) and
606.2 fabricated steel roadway items, as
shown in the following list, and has been a
reliable vendor to that industry since 1987.
Laurel Steel typically stocks many of these
items for immediate shipment.
• H-25 Straight Grate 2 x 4
• H-25 Bicycle Safe Grate 2 x 4
• Steel Vane Grates
• Structural Steel Grade Adjustment Ring
• Cast In Place Light Angle ‘M’ Frame
• Precast Light Angle ‘M’ and ‘C’ Frames
• Light Angle DH Frame
• DH Grates
• H-25 Straight Grate 2 x 6
• ‘H’ Grate and Frame
Advanced robotic welding technology is perfectly suited for standard roadway inlet grates.
23
Roadway Inlets and Frames
In addition to Pennsylvania, Laurel Steel also supplies standard
Laurel Steel also supplies products to the precast industry used in
state-approved items to Maryland, Virginia and New York. We
a wide variety of commercial applications. With an array of grating
welcome the opportunity to develop partnerships with distributors
fixtures available, Laurel Steel can design and supply custom
and users looking for reliable suppliers. Let us provide pricing
products for use in precast drainage boxes and troughs. Let our
based on your drawing and specifications.
Sales Department recommend an inlet or trench grating that
enhances the value of the products that you sell.
2 x 2 Frame/Grate: Consistent quality, ready availability makes
Laurel Steel ideal partners with concrete precasters.
Straight/Vane Grates: Contractors rely on
Laurel Steel for a variety of inlet designs.
Structural frames complement inlet grating line.
24
Walkway Grating
In addition to manufacturing heavy-duty
the simultaneous application of an electric
Laurel Steel keeps a large inventory of the
steel bar grating, Laurel Steel stocks and
current and hydraulic pressure. It is designed
most commonly used walkway grating sizes,
fabricates all of the common styles and sizes
to support pedestrian and light static loads.
both plain and serrated. Stock panels come
in standard widths of 24" or 36", and in
of standard walkway grating. Walkway grating
Walkway grating designations are the same
lengths of 20' or 24'.
is a workhorse product with widespread
as those used for Heavy-Duty Grating, and
application, and has been a stalwart
like heavy-duty grating, can be supplied
A significant application for walkway grating
either smooth or serrated. Bar sizes are
is stair treads; NAAMM standards prescribe
much lighter than heavy-duty grating, ranging
end plates for bolting to stringers, and a
from 3/4 x 1/8 to 2-1/2 x 3/16, and design
variety of nosings, all of which are available
is based on application of uniform and
from Laurel Steel.
performer of long standing in practically all
kinds of commercial and industrial settings.
It has found countless applications in
catwalks, platforms and mezzanines.
Walkway grating is machine manufactured
concentrated loads. Maximum safe spans
by the electro-forge process, where cross
are shown in the accompanying tables.
Laurel Steel stair treads are shown on pages
34 and 35.
bars are welded to bearing bars through
25
Walkway Grating
Standard Panel Widths
Number of
Bearing Bars
11W4
15W4 and 15W2
with 3/16" BB’s
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
3/16" bars
7/8
1 9/16
2 1/4
2 15/16
3 5/8
4 5/16
5
5 11/16
6 3/8
7 1/16
7 3/4
8 7/16
9 1/8
9 13/16
10 1/2
11 3/16
11 7/8
12 9/16
13 1/4
13 15/16
14 5/8
15 5/16
16
16 11/16
17 3/8
18 1/16
18 3/4
19 7/16
20 1/8
20 13/16
21 1/2
22 3/16
22 7/8
23 9/16
24 1/4
6 3/4
7 11/16
8 5/8
9 9/16
10 1/2
11 7/16
12 3/8
13 5/16
14 1/4
15 3/16
16 1/8
17 1/16
18
18 15/16
19 7/8
20 13/16
21 3/4
22 11/16
23 5/8
24 9/16
25 1/2
26 7/16
27 3/8
28 5/16
29 1/4
30 3/16
31 1/8
32 1/16
33
33 15/16
34 7/8
35 13/16
19W4 and 19W2
1/8" bars
7 5/6
7 5/8
8 9/16
9 1/2
10 7/16
11 3/8
12 5/16
13 1/4
14 3/16
15 1/8
16 1/16
17
17 15/16
18 7/8
19 13/16
20 3/4
21 11/16
22 5/8
23 9/16
24 1/2
25 7/16
26 3/8
27 5/16
28 1/4
29 3/16
30 1/8
31 1/16
32
32 15/16
33 7/8
34 13/16
35 3/4
3/16" bars
1/8" bars
4 15/16
6 1/8
7 5/16
8 1/2
9 11/16
10 7/8
12 1/16
13 1/4
14 7/16
15 5/8
16 13/16
18
19 3/16
20 3/8
21 9/16
22 3/4
23 15/16
25 1/8
26 5/16
27 1/2
28 11/16
29 7/8
31 1/16
32 1/4
33 7/16
34 5/8
35 13/16
4 7/8
6 1/16
7 1/4
8 7/16
9 5/8
10 13/16
12
13 3/16
14 3/8
15 9/16
16 3/4
17 15/16
19 1/8
20 5/16
21 1/2
22 11/16
23 7/8
26 1/16
26 1/4
27 7/16
28 5/8
29 13/16
31
32 3/16
33 3/8
34 9/16
35 3/4
Weight Chart (in pounds/square foot)
26
Bearing Bars
Cross Bars
Type 11W4
Type 19W4
Type 19W2
Type 15W4
Type 15W2
3/4 x 1/8
3/4 x 3/16
1 x 1/8
1 x 3/16
1-1/4 x 1/8
1-1/4 x 3/16
1-1/2 x 1/8
1-1/2 x 3/16
1-3/4 x 3/16
2 x 3/16
2-1/4 x 3/16
2-1/2 x 3/16
1/4
1/4
1/4
1/4
1/4
1/4
1/4
5/16
5/16
5/16
5/16
5/16
N/A
9.28
8.29
12.16
10.18
15.04
12.16
18.28
21.16
24.04
26.74
29.62
3.99
5.67
5.15
7.35
6.2
9.03
7.35
10.94
12.62
14.3
15.87
17.55
4.63
6.31
5.79
7.99
6.84
9.67
7.99
11.8
13.48
15.16
16.74
18.42
4.95
7.11
6.44
9.27
7.79
11.43
9.27
13.82
15.98
18.14
20.16
22.32
5.59
7.75
7.08
9.91
8.43
12.07
9.91
14.68
16.84
19
21.03
23.19
Load Table for Steel Walkway Grating Type 19-W
Recom. Max. Span
Bearing Bar
(in.) for 1/4"
Size (in.)
deflection under
Nominal Wt. (lbs.) 100 lb. Uniform Load
3/4 x 1/8"
3.99#
42
3/4 x 3/16
5.67#
46
1 x 1/8
5.15#
51
1 x 3/16
7.35#
57
1-1/4 x 1/8
6.20#
61
1-1/4 x 3/16
9.03#
67
1-1/2 x 1/8
7.35#
70
1-1/2 x 3/16
10.94#
77
1-3/4 x 3/16
12.62#
87
2 x 3/16
14.30#
96
2-1/4 x 3/16
15.87#
105
2-1/2 x 3/16
17.55#
113
Span in Inches
U
Dc
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
24"
30"
36"
42"
48"
54"
355
0.099
355
0.079
533
0.099
533
0.079
632
0.074
632
0.060
947
0.074
947
0.060
987
0.060
987
0.048
1480
0.060
1480
0.048
1421
0.050
1421
0.040
2132
0.050
2132
0.040
2901
0.043
2901
0.034
3789
0.037
3789
0.030
4796
0.033
4796
0.026
5921
0.030
5921
0.024
227
0.155
284
0.124
341
0.155
426
0.124
404
0.116
505
0.093
606
0.116
758
0.093
632
0.093
789
0.074
947
0.093
1184
0.074
909
0.078
1137
0.062
1364
0.078
1705
0.062
1857
0.067
2321
0.053
2425
0.058
3032
0.047
3069
0.052
3837
0.041
3789
0.047
4737
0.037
158
0.223
237
0.179
237
0.223
355
0.179
281
0.168
421
0.134
421
0.168
632
0.134
439
0.134
658
0.107
658
0.134
987
0.107
632
0.112
947
0.089
947
0.112
1421
0.089
1289
0.096
1934
0.077
1684
0.084
2526
0.067
2132
0.074
3197
0.060
2632
0.067
3947
0.054
116
0.304
203
0.243
174
0.304
305
0.243
206
0.228
361
0.182
309
0.228
541
0.182
322
0.182
564
0.146
483
0.182
846
0.146
464
0.152
812
0.122
696
0.152
1218
0.122
947
0.130
1658
0.104
1237
0.114
2165
0.091
1566
0.101
2741
0.081
1933
0.091
3383
0.073
89
0.397
178
0.318
133
0.397
266
0.318
158
0.298
316
0.238
237
0.298
474
0.238
247
0.238
493
0.191
370
0.238
740
0.191
355
0.199
711
0.159
533
0.199
1066
0.159
725
0.170
1451
0.136
947
0.149
1895
0.119
1199
0.132
2398
0.106
1480
0.119
2961
0.095
70
0.503
158
0.402
105
0.503
237
0.402
125
0.377
281
0.302
187
0.377
421
0.302
195
0.302
439
0.241
292
0.302
658
0.241
281
0.251
632
0.201
421
0.251
947
0.201
573
0.215
1289
0.172
749
0.189
1684
0.151
947
0.168
2132
0.134
1170
0.151
2632
0.121
60"
66"
72"
101
0.466
253
0.372
152
0.466
379
0.372
158
0.372
395
0.298
237
0.372
592
0.298
227
0.310
568
0.248
341
0.310
853
0.248
464
0.266
1161
0.213
606
0.233
1516
0.186
767
0.207
1918
0.166
947
0.186
2368
0.149
84
0.563
230
0.451
125
0.563
344
0.451
130
0.451
359
0.360
196
0.451
538
0.360
188
0.376
517
0.300
282
0.376
775
0.300
384
0.322
1055
0.257
501
0.282
1378
0.225
634
0.250
1744
0.200
783
0.225
2153
0.180
70
0.670
211
0.536
105
0.670
316
0.536
110
0.536
329
0.429
164
0.536
493
0.429
158
0.447
474
0.358
237
0.447
711
0.358
322
0.383
967
0.306
421
0.335
1263
0.268
533
0.298
1599
0.238
658
0.268
1974
0.215
78"
84"
93
0.629
304
0.504
140
0.629
455
0.504
135
0.524
437
0.420
202
0.524
656
0.420
275
0.450
893
0.360
359
0.393
1166
0.315
454
0.350
1476
0.280
561
0.315
1822
0.252
81
0.730
282
0.584
121
0.730
423
0.584
116
0.608
406
0.487
174
0.608
609
0.487
237
0.521
829
0.417
309
0.456
1083
0.365
392
0.406
1370
0.324
483
0.365
1692
0.292
90"
96"
102" 108"
101
0.698
379
0.559
152
0.698
568
0.559
206
0.599
774
0.479
269
0.524
1011
0.419
341
0.466
1279
0.372
421
0.419
1579
0.335
89
0.794
355
0.636
133
0.794
533
0.636
181
0.681
725
0.545
237
0.596
947
0.477
300
0.530
1199
0.424
370
0.477
1480
0.381
79
0.897
334
0.718
118
0.897
502
0.718
161
0.769
683
0.615
210
0.673
892
0.538
266
0.598
1128
0.478
328
0.538
1393
0.431
70
1.006
316
0.804
105
1.006
474
0.804
143
0.862
645
0.689
187
0.754
842
0.603
237
0.67
1066
0.536
292
0.603
1316
0.483
To obtain equivalent load for 15W grating, multiply by 1.27.
To obtain equivalent load for 11W grating, multiply by 1.71.
27
Load Table for Welded Stainless Steel Walkway Grating Type 19-W
Recom. Max. Span
Bearing Bar
(in.) for 1/4"
Size (in.)
deflection under
Nominal Wt. (lbs.) 100 lb. Uniform Load
3/4 x 1/8"
3.99#
41
3/4 x 3/16"
5.67#
46
1 x 1/8"
5.15#
51
1 x 3/16"
7.35#
56
1-1/4 x 1/8"
6.20#
60
1-1/4 x 3/16"
9.03#
67
1-1/2 x 1/8"
7.35#
69
1-1/2 x 3/16"
10.94#
77
1-3/4 x 3/16"
12.62#
86
2 x 3/16"
14.30#
95
2-1/4 x 3/16"
15.87#
104
2-1/2 x 3/16"
17.55#
112
Span in Inches
U
Dc
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
24"
30"
36"
42"
48"
54"
395
0.114
395
0.091
592
0.114
592
0.091
702
0.086
702
0.069
1053
0.086
1053
0.069
1096
0.069
1096
0.055
1645
0.069
1645
0.055
1579
0.057
1579
0.046
2368
0.057
2368
0.046
3224
0.049
3224
0.039
4211
0.043
4211
0.034
5329
0.038
5329
0.030
6579
0.034
6579
0.027
253
0.179
316
0.143
379
0.179
474
0.143
449
0.134
561
0.107
674
0.134
842
0.107
702
0.107
877
0.086
1053
0.107
1316
0.086
1011
0.089
1263
0.071
1516
0.089
1895
0.071
2063
0.077
2579
0.061
2695
0.067
3368
0.054
3411
0.060
4263
0.048
4211
0.054
5263
0.043
175
0.257
263
0.206
263
0.257
395
0.206
312
0.193
468
0.154
468
0.193
702
0.154
487
0.154
731
0.123
731
0.154
1096
0.123
702
0.129
1053
0.103
1053
0.129
1579
0.103
1433
0.110
2149
0.088
1871
0.096
2807
0.077
2368
0.086
3553
0.069
2924
0.077
4386
0.062
129
0.350
226
0.280
193
0.350
338
0.280
229
0.263
401
0.210
344
0.263
602
0.210
358
0.210
627
0.168
537
0.210
940
0.168
516
0.175
902
0.140
773
0.175
1353
0.140
1053
0.150
1842
0.120
1375
0.131
2406
0.105
1740
0.117
3045
0.093
2148
0.105
3759
0.084
99
0.457
197
0.366
148
0.457
296
0.366
175
0.343
351
0.274
263
0.343
526
0.274
274
0.274
548
0.219
411
0.274
822
0.219
395
0.229
789
0.183
592
0.229
1184
0.183
806
0.196
1612
0.157
1053
0.171
2105
0.137
1332
0.152
2664
0.122
1645
0.137
3289
0.110
78
0.579
175
0.463
117
0.579
263
0.463
139
0.434
312
0.347
208
0.434
468
0.347
217
0.347
487
0.278
325
0.347
731
0.278
312
0.289
702
0.231
468
0.289
1053
0.231
637
0.248
1433
0.198
832
0.217
1871
0.174
1053
0.193
2368
0.154
1300
0.174
2924
0.139
To obtain equivalent load for 15W grating, multiply by 1.27.
To obtain equivalent load for 11W grating, multiply by 1.71.
28
60"
66"
72"
112
0.536
281
0.429
168
0.536
421
0.429
175
0.429
439
0.343
263
0.429
658
0.343
253
0.357
632
0.286
379
0.357
947
0.286
516
0.306
1289
0.245
674
0.268
1684
0.214
853
0.238
2132
0.190
1053
0.214
2632
0.171
93
0.648
255
0.519
139
0.648
383
0.519
145
0.519
399
0.415
217
0.519
598
0.415
209
0.432
574
0.346
313
0.432
861
0.346
426
0.370
1172
0.296
557
0.324
1531
0.259
705
0.288
1938
0.230
870
0.259
2392
0.207
78
0.771
234
0.617
117
0.771
351
0.617
122
0.617
365
0.494
183
0.617
548
0.494
175
0.514
526
0.411
263
0.514
789
0.411
358
0.441
1075
0.353
468
0.386
1404
0.309
592
0.343
1776
0.274
731
0.309
2193
0.247
78"
84"
104
0.724
337
0.579
156
0.724
506
0.579
149
0.604
486
0.483
224
0.604
729
0.483
305
0.517
992
0.414
399
0.453
1296
0.362
505
0.402
1640
0.322
623
0.362
2024
0.290
90
0.840
313
0.672
134
0.840
470
0.672
129
0.700
451
0.560
193
0.700
677
0.560
263
0.600
921
0.480
344
0.525
1203
0.420
435
0.467
1523
0.373
537
0.420
1880
0.336
90"
96"
102" 108"
112
0.804
421
0.643
168
0.804
632
0.643
229
0.689
860
0.551
299
0.603
1123
0.482
379
0.536
1421
0.429
468
0.482
1754
0.386
99
0.914
395
0.731
148
0.914
592
0.731
201
0.784
806
0.627
263
0.686
1053
0.549
333
0.610
1332
0.488
411
0.549
1645
0.439
87
1.032
372
0.826
131
1.032
557
0.826
178
0.885
759
0.708
233
0.774
991
0.619
295
0.688
1254
0.550
364
0.619
1548
0.495
78
1.157
351
0.926
117
1.157
526
0.926
159
0.992
716
0.793
208
0.868
936
0.694
263
0.771
1184
0.617
325
0.694
1462
0.555
Load Tables for Aluminum Walkway Grating 19-P
Bearing Bar
Size (in.)
Nominal Wt. (lbs.)
Recom. Max. Span
(in.) for 1/4"
deflection under
100 lb. Uniform Load
1 x 1/8"
2#
39
1 x 3/16"
or 1" I-bar
3#
44
1 x 1/4"
4#
47
1-1/4 x 1/8"
3#
47
1-1/4 x 3/16"
or 1-1/4" I-bar
4#
52
1-1/4 x 1/4"
5#
55
1-1/2 x 1/8"
3#
53
1-1/2 x 3/16"
or 1-1/2 I-bar
4#
59
1-1/2 x 1/4"
5#
64
1-3/4 x 3/16"
or 1-3/4" I-bar
5#
66
1-3/4 x 1/4"
6#
71
2 x 3/16"
or 2" I-bar
5#
73
2 x 1/4"
7#
79
2-1/4 x 3/16"
or 2-1/4" I-bar
6#
80
2-1/4 x 1/4"
8#
86
2-1/2 x 3/16
or 2-1/2" I-bar
7#
87
2-1/2 x 1/4"
9#
93
Span in Inches
U
Dc
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
U
Du
C
Dc
24"
30"
36"
42"
48"
54"
421
0.144
421
0.115
632
0.144
632
0.115
842
0.144
842
0.115
658
0.115
658
0.092
987
0.115
987
0.092
1316
0.115
1316
0.092
947
0.096
947
0.077
1421
0.096
1421
0.077
1895
0.096
1895
0.077
1934
0.082
1934
0.066
2579
0.082
2579
0.066
2526
0.072
2526
0.058
3368
0.072
3368
0.058
3197
0.064
3197
0.051
4263
0.064
4263
0.051
3947
0.058
3947
0.046
5263
0.058
5263
0.046
269
0.225
337
0.180
404
0.225
505
0.180
539
0.225
674
0.180
421
0.180
526
0.144
632
0.180
789
0.144
842
0.180
1053
0.144
606
0.150
758
0.120
909
0.150
1137
0.120
1213
0.150
1516
0.120
1238
0.129
1547
0.103
1651
0.129
2063
0.103
1617
0.113
2021
0.090
2156
0.113
2695
0.090
2046
0.100
2558
0.080
2728
0.100
3411
0.080
2526
0.090
3158
0.072
3368
0.090
4211
0.072
187
0.324
281
0.259
281
0.324
421
0.259
374
0.324
561
0.259
292
0.259
439
0.207
439
0.259
658
0.207
585
0.259
877
0.207
421
0.216
632
0.173
632
0.216
947
0.173
842
0.216
1263
0.173
860
0.185
1289
0.148
1146
0.185
1719
0.148
1123
0.162
1684
0.130
1497
0.162
2246
0.130
1421
0.144
2132
0.115
1895
0.144
2842
0.115
1754
0.130
2632
0.104
2339
0.130
3509
0.104
137
0.441
241
0.353
206
0.441
361
0.353
275
0.441
481
0.353
215
0.353
376
0.282
322
0.353
564
0.282
430
0.353
752
0.282
309
0.294
541
0.235
464
0.294
812
0.235
619
0.294
1083
0.235
632
0.252
1105
0.202
842
0.252
1474
0.202
825
0.221
1444
0.176
1100
0.221
1925
0.176
1044
0.196
1827
0.157
1392
0.196
2436
0.157
1289
0.176
2256
0.141
1719
0.176
3008
0.141
105
0.576
211
0.461
158
0.576
316
0.461
211
0.576
421
0.461
164
0.461
329
0.369
247
0.461
493
0.369
329
0.461
658
0.369
237
0.384
474
0.307
355
0.384
711
0.307
474
0.384
947
0.307
484
0.329
967
0.263
645
0.329
1289
0.263
632
0.288
1263
0.230
842
0.288
1684
0.230
799
0.256
1599
0.205
1066
0.256
2132
0.205
987
0.230
1974
0.184
1316
0.230
2632
0.184
83
0.729
187
0.583
125
0.729
281
0.583
166
0.729
374
0.583
130
0.583
292
0.467
195
0.583
439
0.467
260
0.583
585
0.467
187
0.486
421
0.389
281
0.486
632
0.389
374
0.486
842
0.389
382
0.417
860
0.333
509
0.417
1146
0.333
499
0.365
1123
0.292
665
0.365
1497
0.292
632
0.324
1421
0.259
842
0.324
1895
0.259
780
0.292
1754
0.233
1040
0.292
2339
0.233
60"
66"
72"
135
0.900
337
0.720
105
0.720
263
0.576
158
0.720
395
0.576
211
0.720
526
0.576
152
0.600
379
0.480
227
0.600
568
0.480
303
0.600
758
0.480
309
0.514
774
0.411
413
0.514
1032
0.411
404
0.450
1011
0.360
539
0.450
1347
0.360
512
0.400
1279
0.320
682
0.400
1705
0.320
632
0.360
1579
0.288
842
0.360
2105
0.288
111
1.089
306
0.871
87
0.871
239
0.697
130
0.871
359
0.697
174
0.871
478
0.697
125
0.726
344
0.581
188
0.726
517
0.581
251
0.726
689
0.581
256
0.622
703
0.498
341
0.622
938
0.498
334
0.545
919
0.436
445
0.545
1225
0.436
423
0.484
1163
0.387
564
0.484
1550
0.387
522
0.436
1435
0.348
696
0.436
1914
0.348
94
1.296
281
1.037
73
1.037
219
0.829
110
1.037
329
0.829
146
1.037
439
0.829
105
0.864
316
0.691
158
0.864
474
0.691
211
0.864
632
0.691
215
0.741
645
0.592
287
0.741
860
0.592
281
0.648
842
0.518
374
0.648
1123
0.518
355
0.576
1066
0.461
474
0.576
1421
0.461
439
0.518
1316
0.415
585
0.518
1754
0.415
78"
84"
93
1.217
304
0.973
125
1.217
405
0.973
90
1.104
291
0.811
135
1.014
437
0.811
179
1.014
583
0.811
183
0.869
595
0.695
244
0.869
794
0.695
239
0.761
777
0.608
319
0.761
1036
0.608
303
0.676
984
0.541
404
0.676
1312
0.541
374
0.608
1215
0.487
498
0.608
1619
0.487
81
1.411
282
1.129
107
1.411
376
1.129
77
1.176
271
0.941
116
1.176
406
0.941
155
1.176
541
0.941
158
1.008
553
0.806
211
1.008
737
0.806
206
0.882
722
0.706
275
0.882
962
0.706
261
0.784
914
0.627
348
0.784
1218
0.627
322
0.706
1128
0.564
430
0.706
1504
0.564
90"
96"
102" 108"
67
1.350
253
1.080
101
1.350
379
1.080
135
1.350
505
1.080
138
1.157
516
0.926
183
1.157
688
0.926
180
1.013
674
0.810
240
1.013
898
0.810
227
0.900
853
0.720
303
0.900
1137
0.720
281
0.810
1053
0.648
374
0.810
1404
0.648
59
1.536
237
1.229
89
1.536
355
1.229
118
1.536
474
1.229
121
1.317
484
1.053
161
1.317
645
1.053
158
1.152
632
0.922
211
1.152
842
0.922
200
1.024
799
0.819
266
1.024
1066
0.819
247
0.922
987
0.737
329
0.922
1316
0.737
52
1.734
223
1.387
79
1.734
334
1.387
105
1.734
446
1.387
107
1.486
455
1.189
143
1.486
607
1.189
140
1.301
594
1.040
186
1.301
793
1.040
177
1.156
752
0.925
236
1.156
1003
0.925
219
1.040
929
0.832
291
1.040
1238
0.832
47
1.944
211
1.555
70
1.944
316
1.555
94
1.944
421
1.555
96
1.666
430
1.333
127
1.666
573
1.333
125
1.458
561
1.166
166
1.458
749
1.166
158
1.296
711
1.037
211
1.296
947
1.037
195
1.166
877
0.933
260
1.166
1170
0.933
To obtain equivalent load for 15W grating, multiply by 1.27.
To obtain equivalent load for 11W grating, multiply by 1.71.
29
Walkway Grating
Manufacturing Tolerances
All dimensions given are maximum permissible tolerances.
1/8
WIDTH (W) overall ± 1/4"
12
o.c. ± 1/32"
1/8"
Cross bar
shall not var y
more than 1/8
in 12 in either
direction from
perpendicular
alignment with
bearing bars.
1/8"
"
±1/4" o-c end cross bars in 5'0" length
D1
SPAN ± 1/4"
=D
D
=1
/4
cross bar alignment and spacing
1/16"
cross bars
bearing bars
cross bar location
D and D' are
overall diagonal
dimensions
W1 ± W = 1/4"
W and W' are
overall lengths
of cross bars at
opposite ends
of panel.
bearing bars
1/8" per foot of width
overall dimensions and squareness
1/8" per foot of width
transverse bow
(before fastening to supports)
12
bearing bar lean
1-1/4
1/200 of span
bearing bars
12
longitudinal bow
cross bar lean
2-1/2
WIDTH ± 1/8"
Stair Tread Tolerances
12
carrier plate lean
1/16" ± 1/16"
LENGTH = 0" – 1/8"
overall dimensions
NOTE: Length of tread is distance between outer faces
of carrier plates or back-to-back of carrier angles.
carrier angle overrun
30
1/2
Walkway Grating
Standard Installation Clearances
SPAN
(direction of bearing bars)
1/4"
panel span
1/4"
panel span
bearing
bars
panel width
bearing
bars
1/4"
1/4"
panel width
1/4" clearance
between ends
of cross bars
on rectangular
grating.
3/8"
bearing
bars
bearing
bars
*
*
bearing
bars
min. clearance
equal to support
angle thickness
bearing
bars
1/2"
Clearances shown are recommended, but vary in accordance with
dimensional tolerances shown on page 30.
bearing
bars
bearing
bars
Cutouts for circular obstructions are recommended to be at
least 2 in. larger in diameter than the obstruction. It is further
recommended that cutouts for all piping 4 in. or less in diameter
be made in the field.
*This dimension varies due to bearing bar
spacing but will not exceed bearing bar spacing.
As shown in the drawing at left, all rectangular cutouts are made to
the next bearing bar beyond the penetration with a clearance not
to exceed bearing bar spacing.
specified
cutout – 4" x 6"
actual
cutout – 5 3/4" x 6"
bearing bar spacing-1 3/16"
31
Walkway Grating
All gratings are to be firmly anchored to their supports by positive means.
Anchoring Details
one weld in middle
of panel at each
intermediate suppor t
3/16"
1
3/4"
Welded Anchorage
(in field by others)
Recommended for all permanently
installed gratings.
3/16"
3/4"
Welds at ends of bearing
bar approximately 6 in.
from each side of panel
bearing bars
2 Saddle Clips
Available in steel, stainless steel
and aluminum (it is sometimes
necessary to cut cross bars during
installation for fastener clearance.)
Used for installations where
grating is subject to removal.
Will be in same location as welds
in 1 unless otherwise specified.
Clips are available from
grating manufacturer. Other
fastening accessories are
available upon request
Fasteners are 1/4 in. diameter.
3 Weld Lugs
shop welded to bearing bars —
must be specified when ordering
Used for installations where
grating is subject to removal.
Will be in same location as welds
in 1 unless otherwise specified.
Fasteners are 1/4 in. diameter.
Lugs are available from
grating manufacturer. Bolts
and other fastening
accessories are available
upon request.
32
4 Other Types
mechanical friction anchors which can be installed without
Other types of anchors which have been appropriately
eliminate field welding and/or drilling. These anchors are
tested and have demonstrated satisfactory performance
removable and may be used where gratings are subject to
may be used also. Included in other types are top-mounting
frequent removal.
requiring access to the underside of the grating and which
Walkway Grating
Welding Standards
The welding standards shown here apply to those gratings and treads
STANDARD MBG 533 “Welding Specifications for Fabrication of Steel,
having a clear opening of not less than 5/8 in. between bearing bars
Aluminum and Stainless Steel Bar Grating” for welding specifications
and those galvanized as per Specifications, page 23. See NAAMM
and certification of welders.
Toe Plates
depth of toe plate to be in multiples of 1/2
in. with a maximum of a + d and a minimum
of 4 in. recommended for “a” dimension.
at each bearing bar for
load-carr ying toe plates
t
toe
plate
3/4"
toe plate
5" = o.c. for
toe plate
1/8"
a
1-12
1/8"
3/4"
d
bearing bars
bearing bars
t = bearing bar thickness
d = bearing bar depth
Banding
t
d 1/4"
at each bearing bar for
load-carr ying band
5" = o.c. for trim bands
and trench gratings
1/8"
3/4"
band
band
bearing bars
standard trim band
bearing bars
load banding
(must be specified)
Stair Treads
1/8"
1/8"
carrier
plate
1/8"
carrier
angle
1/8"
5"
1/8"
1/8"
1/8"
1" at mid-span*
1/8"
1" at mid-span*
When carrier plates are used, the bearing bars in the front
On treads over 9-3/4 in. wide, weld end of center bar also.
five inches plus the nosing shall be welded to the carrier
*Treads spanning 4 ft. or more shall have two welds, located at
the third points.
plate as shown.
33
Walkway Grating
Laurel Steel Stair Treads
Laurel Steel stair treads fabricated from electro-forged steel walkway grating can be supplied with either steel checkered plate nosing,
or a cast aluminum abrasive nosing. If steel treads are to be galvanized, the aluminum nosing is bolted to the tread after hot dip galvanizing.
All aluminum treads receive a corrugated nosing.
The dimensions and details shown on the following pages apply to all Laurel Steel treads.
Checker Plate Nosing (Steel)
Cast Aluminum Abrasive Nosing
Corrugated Nosing (Aluminum only)
34
Walkway Grating
Tread Dimensions and Recommended Details
tread width
7/16" ∅ holes in stringer
B
nosing
A
1 1/8"
RUN
7/16" ∅ hole
7/16" slot
carrier plate
2-1/2" x 1/8" minimum
tread with carrier plate detail
RISE
1/2" (min)
TREAD with carrier angles available. Consult
Laurel Steel for details.
RISE
top of platform
or finished floor
Dimension A in tread with carrier plate
detail. (inches)
tread
tread
WIDTH
Nominal Tread Width
(approximate)**
Bearing Bar Centers
NOTE: Tread width should always be greater than tread run by 1/2 in. minimum.
Dimension
A
Dimension B in tread with carrier plate
1 3/16
15/16
6 1/4
7 1/4
8 1/2
9 3/4
11
12
6
7
9
10
10 3/4
11 3/4
detail. (inches)
2 1/2
4 1/2
4 1/2
7
7
7
Grating
Depth
Dimension B
3/4 to 1-1/4
1-1/2 and up
1-3/4
2-1/4
aluminum is usually 2-1/4 regardless of depth
**Consult manufacturer for exact dimension.
Recommended Bearing Bar Sizes
Steel Treads
Bearing Bar Size
inch
3/4 x 3/16
1 x 3/16
1 1/4 x 3/16
1 1/2 x 3/16
Maximum Tread Length*
@ 1 3/16 o.c.
@ 15/16 o.c.
Plain
Serrated
Plain
Serrated
2' - 4"
3' - 5"
4' - 8"
5'- 6"
—
2' - 10"
4' - 2"
5' - 3"
2' - 8"
4' - 0"
5' - 1"
5' - 6"
—
3' - 4"
4' - 6"
5' - 6"
NOTE: When tread length exceeds 5' - 6", design tread for 300 lb.concentrated loads at one-third points.
Aluminum Treads
I Bars
Rectangular Bars
Maximum Tread Length*
@ 1 3/16 o.c.
@ 15/16 o.c.
Bearing Bar Size
inch
1 x 3/16
1 1/4 x 3/16
1 1/2 x 3/16
1 3/4 x 3/16
Plain
Serrated
Plain
Serrated
2' - 4"
2' - 10"
3' - 6"
4' - 3"
—
2' - 7"
3' - 2"
3' - 10"
2' - 6"
3' - 1"
3' - 10"
4' - 8"
—
2' - 9"
3' - 6"
4' - 3"
Bearing
Bar Size
inch
1I
1 1/4 I
1 1/2 I
1 3/4 I
Maximum Tread Length*
@ 1 3/16 o.c.
@ 15/16 o.c.
2' - 4"
2' - 10"
3' - 6"
4' - 3"
2' - 6"
3' - 1"
3' - 10"
4' - 8"
*Maximum tread length based on 300 lb.concentrated load on front 5 in. of tread at center of tread length and
deflection limitation of 1/240 of length. For maximum length under other loadings, consult the manufacturer.
35
Expanded Metal
Complementing Laurel Steel’s Heavy-Duty
and Walkway Grating product offerings is
terminology
Expanded Metal. Used extensively in
STYLE DIMENSION - Nominal dimension Short
industrial settings to enclose machinery
Long Way of Design
and protect personnel, it is also an
Way of Design (SWD)
LWD
LWO
DESIGN SIZE - Actual dimension SWD and
LWD. Measured from a point to a corresponding
point on the following design.
extremely lightweight option for supporting
certain pedestrian and light machinery
SWO- Short Way of Opening.
loads. Its familiar diamond-shaped pattern
SWD
Shor t Way
of Design
SWO
is also used in situations requiring a
decorative appearance.
LWO - Long Way of Opening.
STRANDS - The sides of design.
STRAND THICKNESS - Gauge thickness of
Expanded metal is made from a process
that begins with a solid plate, which is then
Strand Thickness
Strand Width
metal expanded.
STRAND WIDTH - Amount of metal fed under
dies to produce one strand.
‘slit’ by a series of dies to create diamond
patterns of varying configurations. The
resulting product is lightweight and easy to
fabricate on-site. Laurel Steel stocks all of
the common patterns and sheet sizes for
immediate delivery. The Design Tables on
shearing tolerances
pages 37 to 40 describe the available
patterns, sizes, materials and sheet sizes
BOND - Where two strands intersect.
Random Sheared
typically stocked. Call for availability.
Eliminate sprongs or jagged edges.
TOLERANCE - Minus 0 plus 1/2 the design
size, either SWD or LWD.
RANDOM - This type of shearing leaves
prongs or jagged edges.
TOLERANCE ± 1/4"
Bonds
Bonds Sheared
GRATING: ± 1/4"
36
Expanded Metal
Stainless #304 and #316 1/2 - 1-1/2" Diamond
Style
standard*
1/2" - # 18
1/2" - # 16
1/2" - # 13
3/4" - # 18
3/4 - # 16
3/4 - # 13
3/4" - # 9 (10 ga.)
1-1/2" - # 16
1-1/2" - # 13
1-1/2" - # 9 (10 ga.)
Pounds
per
100 SF
Standard Sheet
Size
(feet)
Plain
Width Length
SWD
LWD
73
91
187
48
60
91
205
45
68
137
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
Design Size
(Inches)
Opening Size
(Inches)
Strand Size
(Inches)
SWD
LWD
SWO
LWO
Width Thickness
0.500
0.500
0.500
0.923
0.923
0.923
0.923
1.33
1.33
1.33
1.20
1.20
1.20
2.00
2.00
2.00
2.00
3.00
3.00
3.00
0.437
0.437
0.325
0.812
0.812
0.750
0.687
1.250
1.250
1.250
0.937
0.937
0.875
1.750
1.750
1.687
1.562
2.750
2.625
2.500
0.087
0.087
0.119
0.106
0.106
0.107
0.160
0.115
0.115
0.155
0.050
0.062
0.093
0.050
0.062
0.093
0.140
0.062
0.093
0.140
0.312
0.312
0.240
0.750
0.750
0.625
0.562
1.062
1.000
0.937
1.000
1.000
0.915
1.812
1.812
1.750
1.687
2.750
2.625
2.625
0.098
0.099
0.132
0.118
0.118
0.120
0.165
0.128
0.130
0.165
0.040
0.050
0.080
0.040
0.050
0.070
0.119
0.050
0.079
0.119
Overall
Thickness
(Inches)
Number of Designs
per foot
(%)
Open
Area
SWD
LWD
0.164
0.164
0.225
0.202
0.202
0.202
0.300
0.222
0.222
0.280
24
24
24
13
13
13
13
9
9
9
10
10
10
6
6
6
6
4
4
4
70
70
70
85
83
80
67
85
83
77
0.040
0.050
0.080
0.040
0.050
0.070
0.119
0.050
0.079
0.119
24
24
24
13
13
13
13
9
9
9
9.5
9.5
9.5
5.7
5.7
5.7
5.7
3.8
3.8
3.8
60
60
57
75
75
75
61
80
80
75
*Above material conforms to Militar y Specifications MIL-S-46044A (MR) Type I.
flattened**
1/2" - # 18
1/2" - # 16
1/2" - # 13
3/4" - # 18
3/4 - # 16
3/4 - # 13
3/4" - # 9 (10 ga.)
1-1/2" - # 16
1-1/2" - # 13
1-1/2" - # 9 (10 ga.)
69
86
178
46
57
86
195
43
65
131
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
0.500
0.500
0.500
0.923
0.923
0.923
0.923
1.33
1.33
1.33
1.26
1.26
1.26
2.10
2.10
2.10
2.10
3.15
3.15
3.15
**Above material conforms to Militar y Specifications MIL-S-46044A (MR) Type II.
Aluminum 5005 H-34 1/2 - 1-1/2" Diamond
Style
standard*
1/2" - .051
1/2" - .081
3/4" - .051
3/4" - 081 (Lt.)
3/4" - .081 (Hvy.)
3/4" - .125
1-1/2" - .081
1-1/2" - .125
Pounds
per
100 SF
Standard Sheet
Size
(feet)
Plain
Width Length
SWD
LWD
27
44
17
32
41
65
22
43
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
Design Size
(Inches)
Opening Size
(Inches)
Strand Size
(Inches)
SWD
LWD
SWO
LWO
Width Thickness
0.500
0.500
0.923
0.923
0.923
0.923
1.33
1.33
1.20
1.20
2.00
2.00
2.00
2.00
3.00
3.00
0.375
0.375
0.812
0.750
0.750
0.687
1.187
1.187
0.937
0.937
1.750
1.680
1.680
1.680
2.500
2.500
0.093
0.096
0.109
0.129
0.165
0.169
0.128
0.162
0.051
0.081
0.051
0.081
0.081
0.125
0.081
0.125
Overall
Thickness
(Inches)
0.158
0.186
0.200
0.220
0.300
0.305
0.240
0.300
Number of Designs
per foot
(%)
Open
Area
SWD
LWD
24
24
13
13
13
13
9
9
10
10
6
6
6
6
4
4
65
60
78
76
69
68
85
79
9.50
9.50
5.66
5.66
5.66
5.66
3.80
3.80
61
58
72
70
63
62
77
70
*Above material conforms to Militar y Specifications MIL-M-17999B Class I. Weights, gauges , dimensions and sizes are subject to mill tolerances.
flattened**
1/2" - .051
1/2" - .081
3/4" - .051
3/4" - 081 (Lt.)
3/4" - .081 (Hvy.)
3/4" - .125
1-1/2" - .081
1-1/2" - .125
26
42
16
30
39
62
21
41
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
0.500
0.500
0.923
0.923
0.923
0.923
1.33
1.33
1.27
1.27
2.125
2.125
2.125
2.125
3.15
3.15
0.312
0.312
0.750
0.687
0.687
0.625
1.062
1.000
1.000
1.000
1.812
1.750
1.750
1.750
2.750
2.750
0.104
0.105
0.122
0.143
0.181
0.187
0.143
0.181
0.040
0.060
0.040
0.070
0.070
0.095
0.055
0.080
0.040
0.060
0.040
0.070
0.070
0.095
0.055
0.080
24
24
13
13
13
13
9
9
**Above material conforms to Militar y Specifications MIL-M-17999B Class II. Weights, gauges , dimensions and sizes are subject to mill tolerances.
37
Expanded Metal
Standard
Carbon Steel
Style
Pounds
per
100 SF
Plain
1/4" - # 20
1/4" - # 18
1/2" - # 20
1/2" - # 18
1/2" - # 16
1/2" - # 13
3/4" - # 16
3/4" - # 13
3/4" - # 10 (13 ga.)
3/4" - # 9 (10 ga.)
1" - # 16
1-1/2" - # 18
1-1/2" - # 16
1-1/2" - # 13
1-1/2" - # 10 (13 ga.)
1-1/2" - # 9 (10 ga.)
1-1/2" - # 6 (6 ga.)
2" - # 10 (13 ga.)
2" - # 9 (10 ga.)
86
114
43
70
86
147
54
80
120
180
44
20
40
60
79
120
250
68
90
Galv.
88
104
174
61
94
134
198
51
48
68
90
144
275
81
99
Standard Sheet
Size
(feet)
Width Length
SWD
LWD
4
4
4
4&6
4&6
4&6
4&6
4&6
4&6
4&6
4
4
4
4&6
4&6
4&6
4&6
4
4
8
8
8
8 & 10
8 & 10
8 & 10
8 & 10
8 & 10
8 & 10
8 & 10
8
8
8
8 & 10
8 & 10
8 & 10
8 & 10
8
8
Design Size
(Inches)
Opening Size
(Inches)
Strand Size
(Inches)
SWD
LWD
SWO
LWO
Width Thickness
0.250
0.250
0.500
0.500
0.500
0.500
0.923
0.923
0.923
0.923
1.00
1.33
1.33
1.33
1.33
1.33
1.33
1.85
1.85
1.00
1.00
1.20
1.20
1.20
1.20
2.00
2.00
2.00
2.00
2.40
3.00
3.00
3.00
3.00
3.00
3.00
4.00
4.00
0.125
0.110
0.438
0.438
0.375
0.312
0.813
0.750
0.750
0.688
0.938
1.313
1.250
1.188
1.188
1.125
1.110
1.625
1.563
0.718
0.718
0.938
0.938
0.938
0.938
1.750
1.688
1.625
1.562
2.062
2.625
2.625
2.500
2.500
2.375
2.313
3.438
3.375
0.072
0.072
0.072
0.088
0.087
0.096
0.101
0.096
0.144
0.150
0.087
0.068
0.108
0.105
0.138
0.144
0.203
0.164
0.149
0.036
0.048
0.036
0.048
0.060
0.092
0.060
0.092
0.092
0.134
0.060
0.048
0.060
0.092
0.092
0.134
0.198
0.092
0.134
Overall
Thickness
(Inches)
0.135
0.147
0.140
0.172
0.175
0.204
0.210
0.205
0.290
0.312
0.192
0.140
0.230
0.242
0.284
0.312
0.433
0.327
0.312
Above material conforms to Militar y Specification MIL-M-17194C Type I Class I
1/4" #18 Std. Mesh
1/2 # 16 Std. Mesh
38
1 1/2" #9 Std. Mesh
3/4" #13 Std. Mesh
Number of Designs
per foot
SWD
LWD
48
48
24
24
24
24
13
13
13
13
12
9
9
9
9
9
9
6.5
6.5
12
12
10
10
10
10
6
6
6
6
5
4
4
4
4
4
4
3
3
(%)
Open
Area
45
43
80
72
65
57
78
76
72
68
82
90
85
85
80
76
69
82
84
Expanded Metal
Flattened
Carbon Steel
Style
Pounds
per
100 SF
Standard Sheet Size
(feet)
Plain Galv. Width
SWD
1/4" - #20
1/4" - #18
1/2" - #20
1/2" - #18
1/2" - #16
1/2" - #13
3/4" - #16
3/4" - #14
3/4 - #13
3/4" - #10 (13 ga.)
3/4" - #9 (10 ga.)
1" - #16
1-1/2" - #16
1-1/2" - #14
1-1/2" - #13
1-1/2" - #9 (10 ga.)
82
108
40
66
82
140
51
63
75
114
171
41
38
46
57
114
51
83
98
161
57
74
88
128
188
50
46
54
66
125
4&6
4&6
4&6
4&6
4&6
4&6
4&6
4&6
4&6
4
4&6
4&6
4&6
4&6
4&6
4&6
Length
LWD
8
8
8
8 & 10
8 & 10
8 & 10
8 & 10
8 & 10
8, 10 & 12
8
8, 10 & 12
8
8
8
8 & 10
8, 10 & 12
Design Size
(Inches)
SWD
0.250
0.250
0.500
0.500
0.500
0.500
0.923
0.923
0.923
0.923
0.923
1.000
1.330
1.330
1.330
1.330
Opening Size
(Inches)
Strand Size
(Inches)
LWD
SWO
LWO
Width Thickness
1.05
1.05
1.25
1.25
1.25
1.25
2.10
2.10
2.10
2.10
2.10
2.50
3.20
3.20
3.20
3.20
0.084
0.075
0.375
0.312
0.312
0.265
0.750
0.688
0.688
0.637
0.563
0.813
1.062
1.062
1.062
1.000
0.715
0.715
1.000
1.000
1.000
1.000
1.750
1.813
1.781
1.755
1.688
2.250
2.750
2.750
2.750
2.563
0.079
0.080
0.079
0.097
0.096
0.107
0.111
0.105
0.106
0.160
0.165
0.098
0.119
0.134
0.116
0.158
0.030
0.040
0.029
0.039
0.050
0.070
0.048
0.061
0.070
0.070
0.120
0.050
0.048
0.060
0.070
0.110
Overall
Thickness
(Inches)
0.030
0.040
0.029
0.039
0.050
0.070
0.048
0.061
0.070
0.070
0.120
0.050
0.048
0.060
0.070
0.110
Number of Designs
per foot
SWD
LWD
48
48
24
24
24
24
13
13
13
13
13
12
9
9
9
9
11.600
11.600
9.500
9.500
9.500
9.500
5.700
5.700
5.700
5.700
5.700
4.684
3.750
3.750
3.750
3.750
(%)
Open
Area
35
35
65
60
63
52
74
74
74
68
63
78
83
80
80
75
Above material conforms to Militar y Specification MIL-M-17194C Type II Class I
1/4" #18 Flat Mesh
1/2" #16 Flat Mesh
3/4" #13 Flat Mesh
1-1/2" #9 Flat Mesh
39
Expanded Grating Data
Carbon Steel Expanded Grating
Size
3.0 lbs.
3.14 lbs.
4.0 lbs.
4.27 lbs.
5.0 lbs.
6.25 lbs.
7.0 lbs.
Standard Sheet Size
(feet)
Width
Length
Pounds per
SF
Plain
Galv. Wt.
3
3.14
4
4.27
5
6.25
7
3.15
3.30
4.18
4.46
5.20
6.47
7.25
SWD
SWD
LWD
1.33
2.00
1.33
1.41
1.33
1.41
1.41
5.33
6.00
5.33
4.00
5.33
5.33
5.33
LWD
4&6
8, 10 & 12
4, 5, & 6
8 & 10
4, 5, & 6
8 & 10
4&6
8 & 10
4, 5, & 6
8 & 10
4&6
8 & 12
4
8
Opening Size
(Inches)
Design Size
(Inches)
SWO
0.940
1.625
0.940
1.000
0.813
0.813
0.813
Width
LWO
3.440
4.880
3.440
2.880
3.380
3.380
3.380
Thickness
0.264
0.312
0.300
0.300
0.331
0.350
0.391
(%)
Open
Area
Overall
Thickness
(Inches)
SWD
0.183
0.250
0.215
0.250
0.250
0.312
0.312
9.540
6.656
9.618
8.625
9.655
8.715
8.740
LWD
9
6
9
8.5
9
8.5
8.5
2.25
2.00
2.25
3.00
2.25
2.25
2.25
60
69
55
58
50
50
45
Above material meets all requirements of Militar y Specifications MIL-M 17194C (Metals, Expanded, Steel) and MIL-G 18015 (Ships) Gratings, Metals, other than Bar
Type) and the deflection requirements of Federal Specification RR-G-661-B.
Carbon Steel Flattened Grating
Size
2.8 lbs.
2.95 lbs.
3.75 lbs.
4.02 lbs.
Standard Sheet Size
(feet)
Width
Length
Pounds per
SF
Design Size
(Inches)
Opening Size
(Inches)
Plain
Galv. Wt.
SWD
LWD
SWD
LWD
SWO
LWO
2.8
2.95
3.75
4.02
—
—
—
—
4
4
4
4
8
8
8
8
1.33
2.00
1.33
1.41
5.67
6.38
5.67
4.25
.81
1.31
.81
.75
4.00
5.50
4.00
3.50
Overall
Thickness
(Inches)
Width
Thickness
.285
.340
.320
.315
.16
.220
.190
.210
(%)
Open
Area
SWD
.160
.220
.190
.210
LWD
9
6
9
8.5
2.25
2
2.25
3
55
64
50
53
Grating Selection Chart (Carbon Steel)
Carbon Steel Catwalk Grating
Expanded metal grating produced in 10'
Concentrated Load
sections the short way diamond, by 24",
(Lbs. Per Foot of
Length of Catwalk
or Platform)
30" and 36" long way of diamond. The
advantages of catwalk grating are:
Clear Span
(Distance between suppor ts, measured
from the inside edge of one support to the
inside edge of the next suppor t)
23" 30" 35" 42" 47" 54" 60"
fabrication and field handling, unit
10'
SWD
reduced installation costs, ease of
economy and maintenance costs.
Style
Lbs./
Sq. Ft.
10' x 2'
10' x 2'6"
10'3'
3
3.14
4
4.27
5
60 lbs.
63 lbs.
80 lbs.
85 lbs.
100 lbs.
75 lbs.
79 lbs.
100 lbs.
107 lbs.
125 lbs.
90 lbs.
94 lbs.
120 lbs.
128 lbs.
150 lbs.
Weights, Gauges, Dimensions and Sizes listed above
are subject to mill tolerances.
2', 2'6", or 3'
LWD
50 lbs.
Light or Occasional
Pedestrian Traffic
100 lbs.
Normal or Frequent
Pedestrian Traffic
150 lbs.
Heavy or Constant
Pedestrian Traffic
200 lbs.
Pedestrian Traffic
with Light Equipment
250 lbs.
300 lbs.
350 lbs.
3.0 3.0
3.14 3.14
3.0 3.0 3.0
3.14 3.14 3.14
4.0 5.0
4.27 6.25
3.0 3.0
3.14 3.14
3.0 4.0 5.0
3.14 4.27 6.25
7.0
3.0 4.0
3.14 4.27
4.0 5.0 6.25
4.27 6.25
7.0
3.0 4.0
3.14 4.27
4.27 6.25
5.0
7.0
4.0
4.27
4.0
4.27
4.0
4.27
5.0
6.25
6.25
5.0
5.0
6.25
6.25
7.0
7.0
7.0
7.0
7.0
The concentrated load deflections for the above selection char t do
not exceed the 1/4" maximum deflection as stated by Federal
Specification RR-G-661b and the generally accepted recommendation for normal pedestrian comfor t.
Expanded metal inventory
40
Glossary
AASHTO: American Association of State Highway
and Transportation Officials
BAND BAR: Bar welded perpendicular to ends of grating bearing bars
GRATING SPAN: The direction of the grating bearing bars. Often
referred to as grating length.
Effective Clear Span: The distance between points of
or along the line of a cutout, that extends neither above
grating support, as defined in a variety of support
nor below the bearing bars. Band bars can be used for
conditions. (See sketches on page 17)
cosmetic reasons, to protect ends of bearing bars from
GRATING WIDTH: The overall dimension of a grating panel measured
impact or to enhance load distribution properties of grating.
perpendicular to the bearing bars.
Trim Banding: A condition in which a band bar is welded to
NAAMM: National Association of Architectural Metal Manufacturers
ends of bearing bars of a grating panel at about 5” centers;
used primarily to improve appearance and stability.
NOSING: A component applied to front edge of stair tread or to a
grating platform at the top of a stair, for visual safety and
Load Banding: A condition in which a band bar is welded to
to sustain edge loads.
every bearing bar of a grating panel; load bands transfer
load between bearing bars.
PLATE LUG: A fastening device (shop welded into grating panels)
that allows grating to be bolted to supports; used when
BEARING BAR: Primary load-carrying component of grating; bearing
removable grating is desirable.
bars always run in the direction of the grating span.
SADDLE CLIP: A fastening device (supplied loose) that allows
CLEAR OPENING: The distance between the faces of adjacent bearing
grating to be bolted to supports; used when removable
bars of a grating.
grating is desirable.
CROSS BAR: Grating component oriented perpendicular to bearing
SERRATED GRATING: Grating that has the top surface of the bearing
bars that rigidly hold bearing bars at proper spacing.
bars or cross bars (or both) notched or scalloped to improve
CUTOUT: An area of grating removed to clear an obstruction, or to
the skid resistance of the grating.
permit pipes, ducts, columns to pass through the grating.
ELECTROFORGED GRATING: Grating in which bearing bars and cross
bars are joined at their intersections by an automated,
resistance weld.
41
Code of Standard Practice
The NAAMM Heavy-Duty Metal Bar Grating Manual (MGB 532-00)
Quantity Measurements
contains a complete Code of Practice. Excerpts from that manual
are reproduced below and represent generally accepted practice in
the metal bar grating industry.
Quantity measurements for gratings ordered to specific dimensions,
without drawings, shall be based on width times span of each panel,
with no deduction made for cutouts, unless allowances for cutouts
Drawings and Specifications
have been negotiated.
The buyer shall be expected to furnish to the seller a set of
Final grating quantities supplied from drawings shall be on the basis
construction drawings and specifications of current issue showing
of gross area measured center to center of supports, or back to back
the layout of supports and floor openings correctly dimensioned,
of supporting angles or channels, or overall dimensions of grating,
together with the sizes and types of grating required.
whichever is larger, with no deductions for clearances. Allowances for
Limits of Responsibility: In the absence of written notice
to the contrary, the buyer’s construction plans and
cutouts will be determined as follows:
• Deductions in area for circular cutouts will only be
specifications shall be assumed by the seller to be correct in all
allowed when the diameter of the cutout exceeds 3’-6”.
details, and the seller’s responsibility shall be limited to furnishing
The deductions allowance shall be equal to one half
the products in accord with these documents.
the square of the diameter of the cutout.
Information to be provided: If drawings and specifications are not
available, buyer shall provide the following:
Description of grating, using standard nomenclature
Plain or serrated surface
Area to be covered with grating
• Deductions in the area for cutouts other than circular
shall be allowed only when the cutout area exceeds
nine (9) square feet.
• No deductions shall be allowed for any triangular
segment or corners of grating wasted in skew cuts.
Type of anchorage
Span (direction of bearing bars)
Finish
Method of support
Shipping instructions
All critical dimensions
• Measurements of cuts shall be on the basis of a
minimum of one (1) lineal foot per cut per panel. Any
cut in excess of one (1) lineal foot shall be measured
to the next highest lineal foot. Measurement of banding,
toe plates and nosing shall be on the same basis as
that of cuts.
Approval Drawings: If requested by the buyer, seller shall submit
drawings for approval. Buyer shall return drawings marked with his
Backcharges
approval or desired changes. Any additional work not contemplated by
the contract may result in additional negotiations between buyer and
Buyer shall immediately notify seller upon discovery of
seller to reach agreement on the cost of the changes. After
unsatisfactory material; seller shall acknowledge complaint and
all necessary changes are made, the drawings shall be re-submitted
initiate an investigation. Seller shall be given the opportunity
to the buyer for final approval. The seller shall not proceed with any
to inspect product PRIOR TO ANY CORRECTIVE WORK BEING DONE.
shop work until drawings are finally approved. (Note: All Laurel Steel
Seller is responsible for providing grating in accordance with
drawings are completed using the latest CADD technology; drawings
approved drawings and specifications. Seller is NOT responsible
can be e-mailed to minimize the time needed for the drawing
for field changes not received and approved by seller prior to
approval process.)
grating fabrication, improper fabrication and/or erection of
supporting members.
If the inspection and investigation confirm errors in seller’s
fabrication, the seller agrees to replace defective material at
no charge to the buyer.
42
Laurel Steel Division
18 Mount Pleasant Road
Scottdale, PA 15683
(800) 426-1983
(724) 887-7720
(724) 887-9494 Fax
www.mlpsteel.com