The drawings and construction details for 2-hr rated walls are based on assemblies listed by UL and the Gypsum Association. For 1-hr. walls the component additive method in Section 721.6 and the construction requirements in the International Building Code were used. Questions should be directed to 1 (800) TEC-WOOD (832-9663).
A recent test at UL has resulted in a unique listing for a 2-hour fire-resistance rated bearing wall assembly of PyroGuard fire-retardant-treated lumber and PyroGuard fire-retardant-treated plywood. This new listing, UL Design No. V314, covers the vast majority of structure exposures providing an alternative to those designers wanting a UL Design number.