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I am building a yacht club in alberta canada. It is a wood frame, commercial building. The question i have is in regards to the fire code at the stairwell from main floor to basement. I know that fire rated drywall has to be installed on the stairwell without being broken by the stairs. my question is, can my landings break the drywall or do i need the drywall to go on first then build my landings?
Can my supports for the landings go through the drywall? i am a little unfimiliar with commercial code. Thanks guys
 

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Type x has to go on before your landings get attached. At least here.

There really picky on fire code stuff on commercial around here. No breaks in the type x if the wall is supposed to be rated. I use lags for these situations. Nails wont cut it they bend in the drywall under stress. Trust me on this one, I wont tell you how I know this.
 
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