HomeMy WebLinkAboutEvaluation Report; Pyro Guard Fire Resistant Treated Wood1 (�) (1) � 11'l I PZ I . � I I . II) ` (�> (1)11� I" 1'� (1) D) [ ( I �► . I ( .
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FOR !"ADDITIONAL INFORMATION.'- I C 0 iU f I C-W4t OIU 8; 9 6 6
CLASS A-B-0141-M IFILAVIESPR EAD9 CLASS A-R-C ROOF
CCOVERffNGS9 AND HOURLY IFRR E R EMSTAN(CIE RA RNGS
Flamespread classes, roofing classes and hourly ratings are confusing terms and they sometimes get misused. The first is
based on the ASTM E-84/UL 723 "Test for Surface Burning Characteristics of Building Material," the second is based on
ASTM E-108/UL 790, "Test for Fire Performance of Roofing Materials," and the third is based on ASTM E-119 "Fire Tests
of Building Materials."
1FLAMESPR EAD CLASSES
The UBC and BOCA codes use the I -II -III designation, and the Standard code uses A-B-C. The flamespread categories are
as follows per ASTM E-84/UL 723:
Class A or I: Flamespread 25 or less (FRTW, some FR surface coatings)
Class B or II: Flamespead 26 to 75 (other FR surface coatings)
Class C or III: Flamespread 76 to 200 (untreated lumber and plywood)
FRTW must have a flamespread of 25 or less in the 10-minute ASTM E-84/UL 723 test, plus the test is continued for 20
minutes during which there must be no evidence of significant progressive combustion and the flame front may not progress
more than 10.5 feet from the burner. This is far more severe than the 10-minute ASTM E-84 test used for fire retardant
surface coatings and other building materials.
CLASS A-B-C ROO1F COVERINGS
Class A, B, or C roofing systems are sometimes confused with Class A-B-C/I-II-III flamespread categories above. The
t .
tendency is to assume that Class A roof systems have a Class A flamespread, and so on, but there is no correlation.
The ASTM E-108/UL 790 roof covering test does not produce a flamespread rating. It is a pass -fail test under which a
f, f
product either passes the criteria as a Class A, B, or C roof covering system or it doesn't. It is an entirely different test from
ASTM E-84/UL 723, and it includes weathering per the ASTM D-2898 "Standard Rain Test." The highest fire classification
is Class A. Note that a Class C roof system is considered fire retardant while a Class C (or III) building material (as above) is
not. Non -classified roof systems have no fire rating.
HOURLY FIRE RESISTANCE RATINGS
Hourly ratings are a function of the assembly being used (wall, floor, door, ceiling, roof, etc.) and generally require use of a
noncombustible membrane (e.g. gypsum, masonry). ASTM E-119 "Fire Tests of Building Construction Materials" is the test
used to determine the hourly rating of an assembly. It exposes an assembly to heat and flame on one side and tests for heat
transmission, burn -through, structural integrity and the ability to withstand a hose stream from a fire hose.
Flamespread classification per ASTM E-84, 30-minute duration, has no relation to a 30-minute rating or any other hourly
rating, which must be determined by ASTM-El 19. FRTW's advantage over untreated wood and other combustible
materials is the fact that it doesn't ignite or contribute to the spread of flame. Fire Retardant Treated Wood cannot be
substituted for type-X gypsum in a rated assembly but can be substituted for untreated wood in a rated assembly. Building
codes often allow this substitution which means wood can be used in non-combustible construction.
Class -ABC: 3/99
Reissued March 1, 2009
This report is subject to re-examination in two years.
WWw.6cc_es.o1 (300) 423-6537 1 (562) 699-0543 A Subsidiary of the International Code Council®
DIVISION: 06—WOOD AND PLASTICS
Section: 06070—Wood Treatment
REPORT HOLDER:
HOOVER TREATED WOOD PRODUCTS, INC.
154 WIRE ROAD
THOMSON, GEORGIA 30824
(706) 595-7355
x ww.frtw.com
EVALUATION SUBJECT:
PYRO-GUARD° TIRE -RETARDANT -TREATED WOOD
1.0 EVALUATION SCOPE
Compliance with the following codes:
0 2006 International Building Code® (IBC)
0 2006 International Residential Code® (IRC)
Properties evaluated:
o Flame spread
o Structural
o Corrosion
o Hygroscopicity
2.0 USES
PYRO-GUARD° fire -retardant -treated wood is used in
areas not exposed to the weather or wetting where the
code permits the use of wood or fire -retardant -treated
wood.
3.0 DESCRIPTION
3.1 General:
PYRO-GUARD® fire -retardant -treated wood is lumber and
plywood that is pressure impregnated with the Hoover
Treated Wood Products, Inc., fire retardant chemical
PYRO-GUARD®. PYRO-GUARD® fire -retardant -treated
lumber and plywood is produced in accordance with an
approved quality control procedure at facilities listed in
Section 5.6 of this report.
PYRO-GUARD® treated lumber of the following species
is recognized as being fire -retardant -treated wood: alpine
fir, balsam fir, black spruce, Douglas fir, Englemann
spruce, hem -fir, jack pine, lodgepole pine, ponderosa pine,
red spruce, southern pine, spruce -pine -fir (SPF), western
hemlock, white fir, and white spruce.
PYRO-GUARD® treated plywood fabricated with face
and back veneers of the following species is recognized as
being fire -retardant -treated wood: southern pine and
Douglas fir for structural applications, and lauan for interior
applications.
3.2 Flame Spread:
PYRO-GUARD® fire -retardant -treated lumber and plywood
have a flame -spread index of 25 or less and a smoke -
developed index of 450 or less when tested in accordance
with ASTM E 84, as modified by IBC Section 2303.2 and
IRC Section R802.1.
3.3 Structural Strength:
The structural performance of PYRO-GUARD® fire -
retardant -treated wood has been evaluated using ASTM D
5516 and D 6305 for plywood and ASTM D 5664 and D
6841 for lumber. The effects of the PYRO-GUARD®
chemical treatment on the strength of treated lumber must
be accounted for in the design of wood members and their
connections. Load -duration factors greater than 1.6 must
not be used in design.
3.3.1 Lumber: The design value adjustments in Table 2
must be used to modify the design values for untreated
lumber found in the AF&PA National Design Specification
(NDS) Supplement Design Values for Wood Construction,
for the applicable species, use and property. Southern pine
and Douglas fir have been evaluated for use in roof
framing and must be subjected to the adjustments
indicated in Table 2 for roof framing. Other softwood
species described in Section 3.1 must be subjected to the
design adjustments indicated in Table 2 for service
temperatures up to 100°F (38°C).
3.3.2 Plywood: The maximum loads and spans shown in
Table 1 must be used to modify the panel span rating for
untreated plywood described in the applicable codes, as
determined by thickness and construction. The adjusted
maximum loads and spans are based on tests of southern
pine and Douglas fir and are applicable to all softwood
species.
3.4 Corrosion:
The corrosion rate of aluminum, carbon steel, galvanized
steel, copper or red brass in contact with wood is not
increased by PYRO-GUARD® fire -retardant treatment
when the product is used as recommended by Hoover
Treated Wood Products, Inc.
3.5 Hygroscopicity:
The moisture content of PYRO-GUARD° fire -retardant -
treated lumber and plywood is less than 28 percent when
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 far its use. There is no warranty by ICC Evaluation Service, Inc., express or implied, as oEg`_�
to any fording or other matter in this report, or as to any product covered by the report.
Page 1 of 4
Copyright 0 2009
ESR-1791 I Most WidelyAcce; and Trusted Page 2 of 4
evaluated in accordance with ASTM D 3201 at 92 percent
relative humidity (Section 2303.2.4 of the IBC). PYRO-
GUARD® is suitable for use in interior conditions where
sustained relative humidity is 92 percent or less and
condensation does not occur.
4.0 DESIGN AND INSTALLATION
4.1 General:
Structural systems that include PYRO-GUARD® fire -
retardant -treated lumber or plywood must be designed and
installed in accordance with the applicable code using the
appropriate lumber design value adjustment factors and
plywood spans from Tables 1 and 2 of this report.
Ventilation must be provided in compliance with the
applicable codes.
The design value adjustment factors and plywood spans
in Tables 1 and 2 of this report are applicable under
elevated temperatures resulting from cyclic climatic
conditions in the continental United States. They are not
applicable under continuous elevated temperatures
resulting from manufacturing or other processes which
must require special consideration in design. Such
conditions are outside the scope of this report.
All of the wood species listed in Section 3.1 of this report
are permitted for interior applications and have been
evaluated for structural performance for interior
applications where the service temperature does not
exceed 100°F (37.80C). Southern pine and Douglas fir
have been evaluated for structural performance for roof
framing applications as indicated in Table 2 of this report.
Southern pine and Douglas fir plywood are permitted for
structural applications limited to the spans and loads
indicated in Table 1 of this report.
Exposure to precipitation during storage or installation
must be avoided. If material does become wet, it must be
replaced or permitted to dry (maximum 19 percent
moisture content for lumber and 15 percent moisture
content for plywood) prior to covering or enclosure by
wallboard or other construction materials (except for
protection during construction).
4.2 Fasteners:
Fasteners used in PYRO-GUARD® fire -retardant -treated
wood must be in accordance with IBC Section 2304.9.5 ,
IRC Section R319.3, or other corrosion -resistant materials
that are manufactured from materials listed in Section 3.4
of this report, and must be subject to the design value
adjustments indicated in Table 2 of this report.
5.0 CONDITION-&- r USE
The PYRO-GUARD fire -retardant -treated wood described
in this report complies with, or is a suitable alternative to
what is specified in, those codes listed in Section 1.0 of
this report, subject to the following conditions:
5.1 Strength calculations must be subject to the design
value adjustment factors and span ratings shown in
Tables 1 and 2 of this report.
5.2 he design value adjustment factors and span ratings
given in this report must only be used for unincised
dimensional lumber and plywood of the species noted
in this report.
5.3 PYRO-GUARD treated wood must not be installed
where it will be exposed to weather or damp or wet
conditions.
5.4 PYRO-GUARD treated wood must not be used in
contact with the ground.
5.5 Except for the following, PYRO-GUARD lumber must
not be ripped or milled, as this will alter the surface -
burning characteristics and invalidate the flame -
spread classification: end cuts, holes, and joints such
as tongue and groove, bevel, scarf and lap. PYRO-
GUARD plywood may be cut or ripped in any
direction.
5.6 Treatment is at the facilities of Hoover Treated Wood
Products, Inc., in Thomson, Georgia; Pine Bluff,
Arkansas; Milford, Virginia; Detroit, Michigan; and
Winston, Oregon; under a quality control program with
inspections by Timber Products Inspection Inc. (AA-
696).
6.0 EVIDENCE SUBMITTED
Data in accordance with the ICC-ES Acceptance Criteria
for Fire -retardant -treated Wood (AC66), dated February
2006.
7.0 IDENTIFICATION
Lumber and plywood treated with PYRO-GUARD° fire -
retardant chemicals must be identified by the structural
grade mark of an approved agency. In addition, all treated
lumber and plywood must be stamped with the name of the
inspection agencies [Underwriters Laboratories Inc. (AA-
668) and Timber Products Inspection Inc. (AA-696)], the
Hoover Treated Wood Products, Inc. or listee, name and
treatment location, labeling information in accordance with
Section 2303.2.1 of the IBC, and the evaluation report
number (ESR-1791).
ESR-1791 I Most WidelyAcceph. ;d Trusted - Page 3 of 4
TABLE 1— MAXIMUM LOADS AND SPANS FOR PYRO-GUARD® Yt-, rt'ED PLYWOOD
PLYWOOD9
THICKNESS
(inches)
UNTREATED
ROOF/SUBFLOOR
SPAN RATING
1,2,3,4,5,8,11,12
PYRO-GUARD'
ROOF SHEATHING MAX. LIVE LOAD (psf)
PYRO-GUARD""
SUBFLOOR
Span
(inches)
Climate Zone6,7
Span
(inches)
1A
1B
2
15132, 1/2
32116
24
19
30
43
16
19/32, 8/8
40/20
24
32
42
20
64
32
87
45
20
20
23/32r 3/4
48/24
32
48
34
10
51
18
71
27
24
24
7/8
—
48 1
12
20
30
—
11/8
—
48 1
21
33
47
48
For SI: 1 inch = 25.4 mm, 1 psf = 48 N/m`.
1. All loads are based on two -span condition with panels 24 inches wide or wider, strength axis perpendicular to supports.
2. Fastener size and spacing must be as required in the applicable building code for untreated plywood of the same thickness; except that
roof sheathing must be fastened with (1) minimum 8d common or 8d deformed shank nails spaced a maximum 6 inches o.c. at edges
and a maximum of 12 inches o.c. at intermediate supports for panels on 24- and 32-inch spans and spaced a maximum of 6 inches o.c.
on all supports for panels on a 48-inch span, or (2) other fasteners with comparable withdrawal and lateral load capacities at the same
maximum spacings. For 11/8-inch roof sheathing panels, minimum 10d common or deformed shank nails must be used.
3. Roof spans and loads apply to roof systems having the minimum ventilation areas required by the applicable building code. Fifty percent
of required vent area must be located on upper portion of sloped roofs to provide natural air flow.
4. For low -sloped or flat roofs with membrane or built-up roofing having a perm rating less than 0.2, use rigid insulation having a minimum R
value of 4.0 between sheathing and roofing, or use next thicker panel than tabulated for the span and load (e.g., 19/32 for 24 inches, 23/32
for 32 inches); and use a continuous ceiling air barrier and vapor retarder with a perm rating less than 0.2 on the bottom of the roof
framing above the ceiling finish.
5. For unblocked roof diaphragms panel edge clips are required for roof sheathing: one midway between supports for 24-inch and 32-inch
spans, two at 1/3 points between supports for 48-inch span. Clips must be specifically manufactured for the plywood thickness used.
6. Tabulated loads for Zone 1A are based on a duration of load adjustment for 7-day (construction) loads of 1.25. Tabulated loads for Zone
1 B and Zone 2 are based on a duration of load adjustment for snow of 1.15. All values within the table are based on a dead load (DL) of
8 psf. If the DL is less than or greater than 8 psf, the tabulated live load may be increased or decreased by the difference. Applicable
material weights, psf: asphalt shingles - 2.0, /2-inch plywood - 1.5, 5/a-inch plywood - 1.8, 3/4-inch plywood - 2.2.
7. Climate Zone definition:
1 - Minimum design roof live load or maximum ground snow load up to 20 psf:
A - Southwest Arizona, Southeast Nevada (area bounded by Las Vegas -Yuma -Phoenix -Tucson)
B - All other qualifying areas of the continental United States
2 - Minimum Rround snow load over 20 psf
8. PYRO-GUARD treated plywood must not be used as roof sheathing if a radiant shield is used beneath the roof sheathing.
9. The 19/32-inch and 5/8-inch thickness are limited to performance rated 4-ply or 5-ply. 23/32- and 3/4-inch thicknesses are limited to
performance rated 5-ply or 7-ply.
10. Subfloor applications are limited to 100 psf maximum live load, except 11/8-inch thickness on 48-inch span limited to 65 psf total load.
11. Deflection of roof sheathing at tabulated maximum live load is less than 1/240 of the span, and under maximum live load plus dead load is
less than 1/180 of the span.
12. Staples used to attach asphalt shingles must be minimum 15/15-inch crown and minimum 1-inch leg, or otherwise comply with the
applicable code, with the quantity of fasteners adjusted in accordance with Table 2 of this report.
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ESR-1791 I Most Widely Acceptl; "I Trusted Page 4 of 4
TABLE 2-DESIGN VALUE ADJUSTMENTS FOR PYRO-GUARD® i rnzATED LUMBER
SERVICE
TEMPERATURE'
PYRO-GUARD®
ROOF FRAMING, CLIMATE ZONE""'
PROPERTY
TO 100°F/38°C
SP
DF
Other
1A
1 B
2
SP
DF
SP
DF
SP
DF
Extreme fiber in bending
0.91
0.97
0.88
0.80
0.90
0.85
0.93
0.89
0.96
Tension parallel to grain
0.88
0.95
0.83
0.80
0.80
0.84
0.87
0.88
0.93
Compression parallel to grain
Horizontal shear
0.94
0.95
1.00
0.96
0.94
0.93
0.94
0.92
0.94
0.95
0.94
0.93
0.98
0.95
0.94
0.94
1.00
0.96
Modulus of elasticity
0.95
0.96
0.94
0.95
0.96
0.95
0.96
0.95
0.96
Compression perp. to grain
Fasteners/connectors
0.95
0.90
0.95
0.90
0.95
0.90
0.95
0.90
0.95
0.90
0.95
0.90
0.95
0.90
0.95
0.90
0.95
0.90
1. Climate Zone definition:
1 - Minimum design roof live load or maximum ground snow load up to 20 psf:
A - Southwest Arizona, Southeast Nevada (area bounded by Las Vegas -Yuma -Phoenix -Tucson)
B - All other qualifying areas of the Continental United States
2 - Minimum ground snow load over 20 psf
2. Duration of load adjustments for snow loads, 7-day (construction) loads, and wind loads given in the National Design Specifications for
Wood Construction apply.
3. Where lumber decking serves as both exposed ceiling and roof sheathing, extreme fiber in bending adjustments of 0.84, 0.83, and 0.89
must be used for southern pine in zones 1A, 113, and 2, respectively; 0.92, 0.92, and 0.96 must be used for Douglas fir in zones 1A, 113,
and 2, respectively; except that where insulation having a minimum R value of 4.0 is installed above the decking, extreme fiber in
bending adjustments of 0.91 for southern pine and 0.97 for Douglas fir are permitted in all zones.
4. Modulus of elasticity values apply to all treated lumber decking.
5. Roof framing adjustment factors apply to roof systems with minimum ventilation areas per applicable code. Locate 50 percent of required
vent area on upper portion of sloped roofs to provide natural air flow.
6. Species: SP - southern pine; DF - Douglas fir; Other softwoods - limited to those species listed in Section 3.1 of this report.
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TRREATED WOOD
PRODUCITS. INC.
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FIGURE 2-LUMBER STAMP