Technical Specifications

STRUCTURAL DURABILITY
The structural durability of FlamePRO brand re retardant treated lumber and plywood has been veried by the certied engineers according to
the latest and most stringent versions of ASTM strength durability standards. FirePro brand re retardant treated lumber and plywood has been
tested by independent accredited laboratories, following industry standards ASTM D5564 & ASTM D5516 to develop strength design factors for
various use conditions.
The National Design Specications (NDS), Wood Handbook, and other publications have cautioned against the use of any wood product in
environments exceeding 150˚F. Based on the strength data generated when tested per industry protocol at an accredited third party laboratory,
professional engineers have calculated design values and span adjustments to modify the untreated design values for lumber and span ratings for
plywood. These design values are applicable at temperatures up to 150˚F for lumber (see Tables 1 and 2) and 170˚F for plywood (see Table 3).
TABLE 1—STRENGTH DESIGN FACTORS FOR FlamePRO
®
FIRE RETARDANT TREATED LUMBER COMPARED
TO UNTREATED LUMBER APPLICABLE AT SERVICE TEMPERATURES UP TO 100°F (38°C)
STRENGTH DESIGN FACTORS Southern Pine Douglas Fir Spruce-Pine-Fir Other Species
Modulus of Rupture (MOR) 0.82 1.00 0.95 0.82
Modulus of Elasticity (MOE) 0.87 1.00 0.94 0.87
Work to Maximum Load (WML) 0.72 0.93 0.90 0.72
Ultimate Tensile Strength (UTS) 0.99 1.00 0.98 0.98
Maximum Compressive Strength (MCS) 0.96 0.96 1.00 0.96
Ultimate Shear Strength (USS) 0.95 1.00 0.99 0.95
Fasteners/Connectors 0.90 0.90 0.90 0.90
1
Climate Zone definition:
Zone 1 – Minimum design roof live load or maximum ground snow load ≤ 20 psf (960 Pa)
Zone 1A – Southwest Arizona, Southeast Nevada (area Bounded by Las Vegas-Yuma-Phoenix-Tucson)
Zone 1B – All other qualifying areas of the United States
Zone 2 – Maximum ground snow load > 20 psf (960 Pa)
2
Duration of load adjustments for snow load, 7-day (construction) loads, and wind loads as given in the National Design Specification for Wood Construction® (NDS) also apply.
TABLE 2—STRENGTH DESIGN FACTORS FOR FlamePRO
®
FIRE RETARDANT TREATED LUMBER COMPARED
TO UNTREATED LUMBER APPLICABLE AT SERVICE TEMPERATURES UP TO 150°F (66°C)
1, 2
STRENGTH DESIGN FACTORS
Southern Pine Douglas Fir Spruce-Pine-Fir Other Species
Climate Zone Climate Zone Climate Zone Climate Zone
1A 1B 2 1A 1B 2 1A 1B 2 1A 1B 2
Modulus of Rupture (MOR) 0.82 0.82 0.82 0.88 0.93 0.96 0.81 0.87 0.93 0.81 0.82 0.82
Modulus of Elasticity (MOE) 0.87 0.87 0.87 1.00 1.00 1.00 0.94 0.94 0.94 0.87 0.87 0.87
Work to Maximum Load (WML) 0.69 0.70 0.71 0.92 0.93 0.93 0.69 0.77 0.87 0.69 0.70 0.71
Ultimate Tensile Strength (UTS) 0.70 0.84 0.96 1.00 1.00 1.00 0.81 0.90 0.97 0.70 0.84 0.96
Maximum Compressive Strength (MCS) 0.66 0.81 0.93 0.84 0.89 0.94 0.83 0.91 0.98 0.66 0.81 0.93
Ultimate Shear Strength (USS) 0.66 0.80 0.93 0.88 0.93 0.98 0.82 0.91 0.97 0.66 0.80 0.93
Fasteners/Connectors 0.66 0.81 0.90 0.84 0.89 0.90 0.83 0.90 0.90 0.66 0.81 0.90
TABLE 3— MAXIMUM LOADS AND SPANS FOR FlamePRO
®
FIRE RETARDANT TREATED
PLYWOOD AT SERVICE TEMPERATURES FROM > 100°F (38°C) UP TO 170°F (77°C)
1, 2, 3, 4, 5
Panel/Sheathing
Thickness
Span Rating
for Untreated
Roof/Sub-oor
Sheathing
FlamePro Roof Sheathing Maximum
Total Load (psf)
FlamePro Wall
or Suboor
SPAN
(INCHES)
CLIMATE ZONE
SPAN (INCHES)
1A 1B 2
15/32, 1/2 32/16 24 31 47 68 16
19/32, 5/8 40/20
24
32
48
27
74
42
107
60
20
20
23/32, 3/4
48/24
32
48
34
15
52
23
76
34
24
24
7/8
32
48
43
19
66
29
95
42
24
24
1
32
48
58
26
88
39
127
57
24
24
1-1/8
32
48
73
32
111
49
161
71
24
24
1
For Surface Temperatures < 100°F, use Untreated Span Ratings.
2
Allowable total loads are for unsanded, Structural 1 & 2 Grade plywood,
manufactured with Group 1 Species, stress grade S-2 (Fb=1650 psi), one-and-
two span conditions.
3
For allowable live loads, subtract dead load (assumed to be 8 psf) from total
loads listed above.
4
Climate Zone definition:
Zone 1 – Minimum design roof live load or maximum ground snow load ≤ 20
psf (960 Pa)
Zone 1A – Southwest Arizona, Southeast Nevada (area Bounded by Las
Vegas-Yuma-Phoenix-Tucson)
Zone 1B – All other qualifying areas of the United States
Zone 2 – Maximum ground snow load > 20 psf (960 Pa)
5
For other load conditions, contact manufacturer.