LP® FlameBlock® Fire-Rated OSB Sheathing, UL Design No. U350 (Type A), Interior, 2-Hour Partition Wall; Fire-Rated on Both Sides

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.

UL Design No. U350 (Type A)

(2-Hour Partition Wall; fire-rated on both sides)

• Commonly used in load-bearing partition walls in multifamily construction, including townhomes
• Labor/material cost savings and reduction in dead load due to elimination of a layer of gypsum (vs. WP3820)
• Cost-effective, space-saving alternative to area separation fire walls using shaft liner (where code-compliant)
• Sound Transmission Class (STC) rating of 61

[Note: There are two types of U350 assemblies]