Barrier Technology

11 November 2010

UL - U350 Two-Hour Interior Party Wall Assembly Allows New Configuration; LP® FlameBlock® Fire-Rated OSB Sheathing on either side of studs.

Barrier is pleased to announce that UL - U350, a UL two-hour rated interior party wall (Barrier ESR-1365: Application 4.3.3) has been approved in a new configuration (Configuration B) that allows LP® FlameBlock® Fire-Rated OSB Sheathing (LP® FlameBlock®) to be moved to the interior stud wall cavity.

As a back-to-back party wall (essentially two one-hour walls built next to each other separating units within a single building), this wall uses LP® FlameBlock® in an attempt to provide the required fire protection without the need for a "shaft-wall liner" with metal H-studs running vertically between the two walls. LP® FlameBlock® adds shear strength to the wall, as each layer of LP® FlameBlock® consists of a layer of LP® OSB coated with Barrier's patented Pyrotite® fire-retardant coating.

While the wall can still be specified and build with standard configuration A (LP® FlameBlock®) plus one layer of 5/8" Type X gypsum on the living side space of the wall), the new configuration offers some potential benefits:

*It may be userd to address vertically up the length of the wall, particularly if extended length (10-foot or 12-foot) LP® FlameBlock® sheets are used; attachment of ceiling/floor trusses on the interior ("living area") side of the wall under this configuration would not penetrate the LP® FlameBlock® placed in an interior stud cavity.

*The wall's living-side surface becomes 5/8" Type X gypsum nailed directly to the stud wall, providing easier cut-ins and access for electrical and plumbing elements (each of these penetrations, though, may need to be fire-blocked; please check with local code officials or Authorities Having Jurisdiction).

Barrier and LP's U350 Two-Hour Interior Party Wall Assembly can be seen CLICK HERE

The wall is also described in the following LP® FlameBlock® Sales Sheet CLICK HERE

Barrier would love to hear from architects, engineers, or designers regarding the use of this new wall configuration in place of shaft-wall-lined party walls.Fire rated sheathing, fire rated osb, fire rated plywood, fire resistant sheathing, fire resistant osb, fire resistant plywood, multifamily construction, small cap, otcbb, ibtgf, barrier, Blazeguard, Mycoguard, fire rated paint, intumescent paint, class a flame spread, class a wall assembly, class c wall assembly, mold resistant, mildew resistant, fire retardant plywood, fire retardant osb, fire retardant sheathing, frt, sips, fire rated structurally insulated panels, thermal barrier, fire rated wall assemblies, fire rated commercial modular roofing, fire rated modular construction, green building products, leed, electrical panel backer board, sips, wildfire protection, forest fire protection, non combustible exterior wall sheathing, ignition resistant exterior wall sheathing, ignition resistant eaves, non combustible eaves, ignition resistant soffets, non combustible soffets, esr-1365, wui approved, wui listed, California state fire marshal approved building materials, specified building product, architectural specifications, builders specs, LP® FlameBlock®, Party Wall, Wall Assembly, Pyrotite®, sheathing, OSB


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Location: Watkins, Minnesota, United States

Barrier develops, manufactures, and markets proprietary fire resistant building materials designed to help protect people and property from the destruction of fire. Barrier's award-winning Blazeguard® structural wood panels exceed International Building Code requirements in every targeted fire test and application. Blazeguard® is coated with Barrier's patented, non-toxic, non-combustible Pyrotite formulation, which releases water when exposed to the heat of fire.