UL recently tested and promulgated a listing for a new two-hour load bearing wood-frame wall assembly containing pressure impregnated fire-retardant-treated wood (FRTW), a move that makes it quicker and easier for building officials to approve plans for Type III construction.
The new listing, UL Design No. V314, is the first fire-resistance rated bearing wall assembly to be tested by UL with FRTW. The design calls for the use of Pyro-Guard® FRT lumber and plywood. A product of Hoover Treated Wood Products, Pyro-Guard lumber and plywood is widely used for weather protected applications in buildings of Type I, II, and III construction.