June 12, 2017
Two layers of 1/2" gypsum is the equivalent to the 5/8" type X gypsum. this comes from the IBC Table 722.6.2. both give a 40minute burn window. hope this helps I will have to get back into my IRC to see if there is a table in there.
April 7, 2015
Table says 5/8 inch Type X gypsum or equivalent. Does anybody know of anything that is equivalent?
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