FlameBlock® Fire-Rated OSB Sheathing W408

LP® FlameBlock® Fire-Rated OSB Sheathing is certified to meet fire codecompliance and delivers higher design values than FRT plywood at thesame thickness. LP FlameBlock sheathing has the versatility to be used inType II, III and V construction, and is a listed component in fire-ratedinterior wall assemblies, exterior wall assemblies and roof deck applications.

UL Design No. W408
(2-Hour Wall; fire-rated for 2 hours inside, 1 hour outside)

Commonly used in Type III load-bearing exterior walls close to property line
Reduces dead load and wall thickness versus common alternatives
Reduces labor costs and construction time
Fiberglass insulation can be used when standard brick is exterior facing
Provides better substrate for securely fastening exterior facing
Exposure 1 classification; withstands normal exposure to moisture during construction

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Specification

Country:
United States

Region:
North America

CODE-APPROVED FIRE-RATED STRUCTURAL SHEATHING
- ICC-certified (ESR-1365)
- 15-minute thermal barrier protection (UBC 26-2)
- 30-minute Class A Flame Spread Rating (ASTM E84, UL723)
- Combination of flame-spread resistance and burn-through resistance
- Code-compliant component of fire-rated interior and exterior wall assemblies and roof decks
DESIGN FLEXIBILITY
Because structural design values for LP FlameBlock sheathing are not reduced by the fire-retardant treatment, the panel carries load/span and shear design values equivalent to an untreated wood structural panel in the same panel thickness category. Using LP FlameBlock sheathing in fire-rated wall assemblies can provide more flexibility in design of wall openings as well as more options in framing and bracing to meet structural requirements.

STRENGTH
Carries design values for load/span and shear that are superior to fire-retardant treated wood structural panels of the same thickness.

WEATHER RESISTANCE
Exposure 1 classification certifies that LP FlameBlock sheathing is able to withstand exposure to moisture during normal construction delays. FRT plywood does not carry Exposure 1 certification.