Is the Horizontal Shaft Wall UL tested?
No. The system has been tested for fire and is covered for use throughout the United States. The fire test number is WHI 495-PSH-0154/0167 and report number is NER-258 and ER-5693. UL, and rightly so, will not provide a number to system that falls outside the scope of ASTM testing. In this case, to meet the requirements of ASTM E119 testing, the system would be considered a floor ceiling assembly. As such it must be structurally designed to carry live and dead loads. Shaft Wall membranes cannot handle live loads. They can only cover dead loads. Also, in some cases the fire exposure on a membrane is from the top, which would never occur in a floor ceiling assembly.
