ICC-ES Legacy Report
ER-2331
Reissued April 2003
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www.icc-es.org | (800) 423-6587 | (562) 699-0543
A Subsidiary of the International Code Council ®
Legacy report on the 1997 Uniform Building Code™
CATEGORY: INSULATION
®
THERMAFIBER INSULATION PRODUCTS
THERMAFIBER LLC
3711 WEST MILL STREET EXTENDED
WABASH, INDIANA 46992
1.0
SUBJECT
®
THERMAFIBER Insulation Products.
2.0
DESCRIPTION
2.1 General:
THERMAFIBER
insulation
products
consist
of
noncombustible, inorganic, asbestos-free, mineral fibers
formed into blankets or semirigid mats of several types, for
various applications. The products have a flame-spread
rating of 25 or less and a smoke-density of 50 or less when
tested in accordance with UBC (1997 Uniform Building
Code™) Standard 8-1. The products are noncombustible
based on tests conducted in accordance with UBC
Standard 2-1.
Figure 1 and Section 2.2 contain specific construction
details. Use of the products in other types of installations,
including uses for sound attenuation and thermal
resistance, requires construction details to be submitted to
the local building official for approval. Data substantiating
sound attenuation and thermal resistance must be
furnished to the local building jurisdiction.
2.1.1
THERMAFIBER FS-25 Flame-resistant Blanket:
The THERMAFIBER FS-25 Flame-resistant Blanker
consists of a foil-faced blanket which is open-faced on the
back side. The foil facing is laminated to polyethylene
scrim or a glass-reinforced scrim. The insulation is
1
1
manufactured in 3-, 3 /2-, 5 /4- and 6-inch (76, 86, 133 and
153 mm) thicknesses and 16- and 24-inch (406 and
610 mm) widths, and in 48-inch (1220 mm) lengths for
friction-fit installation. The blankets are used as insulation
in buildings requiring noncombustible construction.
THERMAFIBER FS-15 Flame-resistant Blanket is the
same as THERMAFIBER FS-25, but without the facing.
2.1.2
THERMAFIBER Sound Attenuation Fire
Blanket: THERMAFIBER Sound Attenuation Fire Blanket
is a paperless, semirigid product manufactured in 16- and
24-inch (406 and 610 mm) widths with a 48-inch
(1220 mm) length. The thicknesses and nominal densities
are 1 inch (25.4 mm) [4 pounds per cubic foot
(64.07 kg/m3)] and 11/2, 2 and 3 inches (38, 51 and 76 mm)
1
3
[2 /2 pounds per cubic foot (40.05 kg/m )]. The sound
attenuation felts are used to reduce sound transmission in
various assemblies requiring noncombustible construction.
2.1.3
THERMAFIBER Curtain Wall Insulation:
THERMAFIBER Curtain Wall Insulation is a preformed,
semirigid insulation manufactured in various widths and in
lengths up to 72 inches (1829 mm) with or without foil
facings. The insulation is available in thicknesses from
1 inch to 6 inches (25.4 mm to 153 mm). The designations
and nominal densities are as follows: CW40, 4 pounds per
3
cubic foot (64.07 kg/m ); CW70, 6 pounds per cubic foot
3
(96.11 kg/m ); and CW90, 8 pounds per cubic foot
(128.14 kg/m3). The material is used in spandrel panels
and curtain wall assemblies requiring noncombustible, firecontainment construction.
2.1.4
THERMAFIBER CW FIRESPAN Insulation:
THERMAFIBER CW FIRESPAN Insulation is a semirigid
insulation manufactured in various widths and in lengths up
to 72 inches (1829 mm), with a foil facing on the interior
side. The insulation is available in two thicknesses,
2 inches (51 mm) (THERMAFIBER CW FIRESPAN 90)
and 3 inches (76 mm) (THERMAFIBER CW FIRESPAN
40). THERMAFIBER CW FIRESPAN is produced under a
listing program with inspections by Underwriters
Laboratories Inc. The material is used in spandrel panels
and curtain wall assemblies requiring noncombustible, firecontainment construction. See Section 2.2 and Figures 2
through 4 for fire-resistive construction details.
2.1.5
THERMAFIBER Blowing Wool: THERMAFIBER
Blowing Wool consists of mineral fibers formed into
nodules for installation by pneumatic equipment. The
product is used as insulation in buildings requiring
noncombustible construction.
2.1.6
THERMAFIBER Mineral Felt Fireproofing:
THERMAFIBER Mineral Felt Fireproofing has a nominal
density of 9 pounds per cubic foot (144.16 kg/m3) and is
used for protecting steel columns and spandrel beams.
The mineral felt contains no asbestos and is produced as
dry sheets. Column fireproofing subject to damage by a
moving vehicle, handing of merchandise, or other means
must
be
protected
in
an
approved
manner.
THERMAFIBER mineral fireproofing provides up to four
hours of protection for various-size columns and beams.
See Figure 1 for fire-resistive construction details.
2.1.7
THERMAFIBER
Safing
Insulation:
THERMAFIBER Safing Insulation consists of a nominal
3
4-pound-per-cubic-foot-density (64.07 kg/m ) mineral wool.
ICC-ES Evaluation Reports are not to be construed as representing aesthetics or any other attributes not specifically addressed, nor are they to be construed
as an endorsement of the subject of the report or a recommendation for its use. There is no warranty by ICC Evaluation Service, LLC, express or implied, as
to any finding or other matter in this report, or as to any product covered by the report.
1000
Copyright © 2014
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ER-2331 | Most Widely Accepted and Trusted
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See Section 2.2 and Figures 2 through 5 for fire-resistive
construction details.
positive means 12 inches (305 mm) on center. No. 22
gage minimum backing reinforcement member is required.
No loads may be superimposed on the THERMAFIBER
Safing. This may require anchored sheet metal cover
plates if loads or foot traffic are possible adjacent to or over
the safing material.
2.2.2.4 Upper Side of Floor Slab: Wall covering must
consist of 5/8-inch (15.9 mm) SHEETROCK Brand
FIRECODE gypsum panels screw-attached to steel
framing. Top of safing must be covered by a minimum of
1 inch (25.4 mm) of FIRECODE compound.
2.2 Installation Detail:
2.2.2.5 Exposed Mullions, Bottom Side of Floor Slab:
Must be covered with 1 inch (25.4 mm) of THERMAFIBER
CW FIRESPAN 90, 2 inches (51 mm) wider than the
mullion, mechanically attached 12 inches (305 mm) on
center.
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The following details are for firestop or safing systems at
floor slab and nonbearing exterior wall interface, in
accordance with Section 709.3.2 of the UBC.
2.2.1
Two-hour Steel Stud Fire Containment Curtain
Wall System: (See Figure 2 for Assemblies A.1, A.2 and
A.3 details.)
2.2.1.1 Framing: Must consist of minimum 35/8-inch
(92 mm) No. 20 gage steel studs spaced a maximum of
24 inches (610 mm) on center.
2.2.1.2 Exterior Face of Stud Wall Covering: Must
consist of 5/8-inch (15.9 mm) SHEETROCK® Brand
®
FIRECODE gypsum sheathing attached to studs with
1
1 /4-inch (31.7 mm) Type S buglehead screws spaced
8 inches (203 mm) on center along the edges and in the
field. Approved exterior systems such as EIFS, portland
cement plaster, brick veneer, or GFRC must be applied
over the gypsum sheathing.
2.2.1.3 Stud Cavity: Minimum 3-inch (76 mm)
THERMAFIBER CW FIRE-SPAN 40 must be friction-fitted
between studs.
2.2.1.4 At Slab Edge: Minimum of 4-inch-thick (102 mm)
1
THERMAFIBER safing insulation [ /2 inch (12.7 mm) wider
than opening] must be secured with safing clips or other
positive means 12 inches (305 mm) on center. Safing must
fill the void from slab edge to the gypsum sheathing.
2.2.1.5 Upper Side of Floor Slab: Wall covering must
consist of 5/8-inch (15.9 mm) SHEETROCK Brand
FIRECODE gypsum panels, screw-attached to framing
with 11/4-inch (31.7 mm) Type S buglehead screws spaced
8 inches (203 mm) on center along the edges and
12 inches (305 mm) on center in the field. Top of safing
must be covered by minimum 1-inch (25.4 mm)
FIRECODE compound. In Assembly A.2, the metal furring
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channel must be attached to the steel studs with /16-inch
(11 mm) panhead screws before attaching the gypsum
panel. In Assembly A.3, steel studs are required on the
floor side, with gypsum panels attached to the interior side
(room side) only.
2.2.1.6 Bottom Side of Floor Slab: Wall covering must
consist of 5/8-inch (15.9 mm) SHEETROCK Brand
FIRECODE gypsum panels attached to curtain wall studs
from bottom track up to height of top of steel strut. Gypsum
panels may be cantilevered from top of strut to underside
of floor. Unprotected steel struts are permitted.
2.2.2
Two-hour Glass Spandrel Fire Containment
Curtain Wall System: (See Figure 3 for Assemblies A.1
and A.2 details.)
2.2.2.1 Framing: Must consist of aluminum mullions
21/2 inches (63.5 mm) wide by 55/8 inches (143 mm) deep,
with a minimum thickness of 0.125 inch (3.2 mm).
2.2.2.2 Spandrel Cavity: Minimum 2-inch-thick (51 mm)
THERMAFIBER CW FIRESPAN 90 must be mechanically
attached 12 inches (305 mm) on center along vertical
aluminum mullion with angle/impaling clips.
2.2.2.3 At Slab Edge: Minimum 4-inch-thick (102 mm)
1
THERMAFIBER safing insulation ( /2 inch [12.7 mm] wider
than opening) must be secured with safing clips or other
2.2.2.6 Impaling Pins and Z-shaped Safing Clips: Must
be installed in accordance with the manufacturer’s
instructions.
2.2.3
Three-hour
Aluminum
Spandrel
Containment Curtain Wall System: (See Figure 4.)
Fire
2.2.3.1 Framing: Must consist of tubular aluminum
mullions with a minimum thickness of 3/32 inch (2.4 mm).
2.2.3.2 Spandrel Panels: Must be minimum 1/8-inch-thick
(3.2 mm) aluminum (in the field) progressing to 1/4-inchthick (6.4 mm) aluminum perimeters.
2.2.3.3 Curtain Wall Insulation: Must be minimum
2-inch-thick (51 mm) THERMAFIBER CW FIRESPAN 90,
friction-fitted between mullions. All joints must be covered
with pressure-sensitive foil scrim kraft tape.
2.2.3.4 Interior Face of Mullions: Must be covered with
1-inch-thick-by-6-inch-wide (25.4 mm by 153 mm) strips of
THERMAFIBER CW FIRESPAN 90.
2.2.3.5 At Slab Edge: Minimum 4-inch-thick (102 mm)
THERMAFIBER Safing Insulation (1/2 inch [12.7 mm] wider
than opening) must be secured with safing clips or other
positive means 12 inches (305 mm) on center. Top of
safing must be covered with a minimum of 1 inch
(25.4 mm) of FIRECODE compound.
2.2.3.6 Safing Clips: Z-shaped clips must be installed as
required by the manufacturer’s installation instructions.
2.2.3.7 Impaling Pins: Must be installed as required by
the manufacturer’s installation instructions.
2.2.3.8 Support Clips for the Stiff Back Channels:
Clips must be attached to the mullions with two 3/8-inchlong (9.5 mm) Type S-12 panhead screws. The stiff back
channel must be attached to each support clip with one 3/8inch-long (9.5 mm) Type S-12 panhead screw.
2.2.3.9 Support Clips for the J-support Channel: Clips
3
must be attached to the mullions with two /8-inch-long
(9.5 mm), Type S-12, panhead screws. Minimum No. 22
gage, J-shaped, 1/2-by-1-by-3-inch (12.7 by 25.4 by
76 mm) galvanized support channel must be installed
horizontally and attached to each support clip with one
3
/8-inch-long (9.5 mm) Type S-12 panhead screw. The
back of the insulation must be in contact with the 3-inch
(76 mm) leg of the support channel.
Firestopping must consist of the following for the
periphery of fire-resistive partitions terminating at the
underside of fluted decking, when protection of openings is
required (see Figure 5):
1.
1
Maximum 1 /2-inch-deep (38 mm) steel fluted deck
formed from minimum No. 22 gage sheet steel.
2.
Minimum 31/2-inch-thick (86 mm), nominal 4 pcf
3
(64.07 kg/m ) density THERMAFIBER Safing
Insulation.
ER-2331 | Most Widely Accepted and Trusted
3.
Minimum 1/2-inch-thick (12.7 mm) layer of FIRECODE
compound, each side of safing, for a one-hour rating.
4.
Minimum 1-inch-thick (25.4 mm) layer of FIRECODE
compound, each side of safing, for a two-hour rating.
5.
Safing and compound are installed between the flutes
on top of the fire-resistive-rated steel stud wall.
6.
Wall construction consists of minimum No. 20 gage
steel studs installed a maximum of 24 inches
(406 mm) on center. See Assembly A.1. Minimum
21/2-inch (63.5 mm), No. 25 gage steel studs, installed
a maximum of 24 inches (406 mm) on center, are
required in Assembly A.2. The remainder of wall
construction must comply with appropriate one-hour
or two-hour fire-resistive details.
3.0
EVIDENCE SUBMITTED
Results of flame-spread tests in accordance with UBC
Standard 8-1, fire-resistance tests per UBC Standard 7-1,
and noncombustibility tests per UBC Standard 2-1; and
descriptive literature.
4.0
FINDINGS
That the THERMAFIBER® insulating materials
described in this report comply with 1997 Uniform
Building Code™ (UBC), subject to the following
conditions:
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Wood stud partitions can be fire-blocked with
THERMAFIBER safing material to meet the requirements
of Section 708.2 of the UBC, provided the safing material
1
is /2 inch (12.7 mm) wider than the cavity, and extends a
minimum of 4 inches (102 mm) within the cavity.
2.3 Identification:
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The products are packaged in cartons, or are poly shrinkwrapped, and are identified by labels or stencils bearing
the ThermaFiber product name, thickness and related
information, the ThermaFiber LLC name and address, and
the evaluation report number (ER-2331). Flame-spread
characteristics are also included for the THERMAFIBER
FS-25 Flame-resistant Blanket.
4.1 The insulating material is installed as described in
this report and the manufacturer’s instructions.
4.2 Construction details and use of material not
specifically addressed in this report require local
building jurisdiction review and approval. When
supplementary materials which may change the
capacity for heat dissipation are incorporated into
a fire-resistive assembly, fire test results or other
substantiating data shall be made available to the
building official to show that the required fireresistive time period is not reduced.
4.3 The use of insulating materials in assemblies
required to comply with Section 706 of the UBC is
beyond the scope of this report.
This report is subject to re-examination in two years.
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ER-2331
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FIGURE 1—COLUMN AND BEAM FIREPROOFING DETAILS
COLUMN/BEAM SIZES1
FIRE PROTECTION
THICKNESS
HOURLY RATING
W14 by 228
W10 by 49
W10 by 49
2 inches
4 inches
1
2 /2 inches
4 hours
3 hours
2 hours
For SI: 1 inch = 25.4 mm.
1Column and beam sizes are minimums. Ratings apply to columns/beams with equal or
greater W/D ratios to those shown.
Notes:
Two-hour rating consists of one layer of 21/2-inch-thick THERMAFIBER Mineral Fireproofing attached to columns
with barbed impaling angles or wire impaling fasteners (column clips) long enough to accommodate the fireproofing
thickness. Fasteners are spaced not greater than 24 inches on center and 33/4 inches from end of batts. Fireproofing
is impaled over the ends of fasteners and held in place with 11/2-inch-square No. 26 gage shields. Spacing of
horizontal joints can not exceed two per 8 feet of column height. Vertical joints are only allowed at corners, as shown.
Three-hour rating consists of two layers of 2-inch minimum thickness THERMAFIBER Mineral Fireproofing attached
to columns with barbed impaling angles or wire impaling fasteners (column clips) minimum 5 inches long to
accommodate the fireproofing thickness. Fasteners are fitted onto column flange edges and spaced not greater than
16 inches on center and 33/4 inches from end of batts. Fireproofing is impaled over fasteners held in place with
11/2-inch-diameter or square No. 26 gage clinch shields. Spacing of horizontal joints can not exceed two per 8 feet of
column height. Vertical joints are only allowed at corners and lapped as shown.
Four-hour rating consists of one layer of 2-inch-thick THERMAFIBER Mineral Fireproofing attached to columns with
barbed impaling angles or wire impaling fasteners (1/8-inch-diameter steel) with continuous 1-inch-diameter wire
head long enough to accommodate the fireproofing thickness, resistance-welded to flange edges and 3/4 inch from
edges on flange faces after placing batts, spaced not greater than 24 inches on center and 33/4 inches from ends of
batts. Spacing of horizontal joints can not exceed two per 8 feet of column height. Vertical joints are only allowed at
corners as shown.
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ER-2331
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FIGURE 2—CONSTRUCTION DETAILS AT FLOOR SLAB AND EXTERIOR WALL INTERSECTION
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FIGURE 2—CONSTRUCTION DETAILS AT FLOOR SLAB AND EXTERIOR WALL INTERSECTION—(Continued)
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FIGURE 3—CONSTRUCTION DETAILS FOR GLASS SPANDREL AND CONCRETE FLOOR INTERSECTION
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FIGURE 4—CONSTRUCTION DETAILS FOR ALUMINUM SPANDREL AND CONCRETE FLOOR INTERSECTION
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FIGURE 5—FIRESTOPPING PERIPHERY OF FIRE-RESISTIVE PARTITIONS OF UNDERSIDE OF STEEL DECK