familiar with UL-263?
familiar with UL-263?
(OP)
hello, would you explain what is UL-263 say about 1 hour fire rated design for walls and floors? i have a detail from national gypsum to increase the existing 3/4" plaster walls to 1 hour rated walls by installing 1 layer of 5/8" type-X to existing plaster walls. am i missing anything to add? is it sufficiant to use existing plaster walls thats in very good shape and just add one layer of type-X on top of it so it meets the 1 hour fire rate? your help is very appreciated . thanks





RE: familiar with UL-263?
The 5/8"-X is rated by UL for a "1 hour" fire barier. Adding this layer to exixting plaster should provide this rating. Penetrations (doors, cableways, penetrations) should be addressed so the assembly provides required barrier.