Fire separation assemblies

Contrary to popular belief, the gypcrete in the UL L-528 floor ceiling assembly is not required to achieve the 1 hour rating. Flooring system No. 1 specifically shows underlayment without any sort of gypcrete.

UL ratings can be accessed online here.

Fire resistance assemblies can be selected by fire rating here. This is a cool little interactive exercise that avoids having to thumb through the Big Orange Book. It's still a good idea to consult the B.O.B. anyway as we can't depend entirely on the web...



Use ALL the tools at your disposal.