Simpson Strong-Tie Adds Fire Rating Standards

Simpson Strong-Tie’s RTUD and ATUD take-up components of its Strong-Rod anchor tiedown and uplift restraint systems are now UL listed as through-penetration firestop solutions when used in conjunction with Simpson Strong-Tie bearing plates. Designed for securing mid-rise wood-framed buildings against forces caused by seismic and wind events, Strong-Rod systems include ratcheting take-up devices (RTUD) and expanding, screw-style take-up devices (ATUD) that work with the threaded rod assembly to compensate for wood shrinkage, providing a constant, continuous load path for maximum resilience to seismic and high-wind events. In order to obtain data and fire-rating coverage on multiple hour-rating assemblies, Simpson Strong-Tie, partnering with RectorSeal, a UL-certified testing laboratory, constructed wood-framed floor-to-ceiling assemblies per UL and ASTM standards and then had them set on fire inside a high-capacity, industrial furnace for one-hour and two-hour rating tests.