Long story made short, this building is a bar on the main floor with separate living areas on the above floor (10 rooms with laundry). Im working with the owner as im a newer inspector trying to help where i can. The owner had me inspect the building and it was rough to say the least. however he’s trying to get the life and safety/Fire permit, they are requiring fire separation between rooms and he has asked what type of insulation this is assumed to be almost looks like buffalo board but not really? Will attach the pictures i was sent from him. This inspection was done in december btw Im 99.9% sure the insulation is not fire rated nor is the drywall but the customer is determined to know and thinks it is. Any help or thoughts is REALLY appreciated. Also this was a quick post between jobs can add more info later if needed.
First pic looks like sound board with old drywall on top with newer drywall on top of that? Hard to tell looking at a pic without examining it.
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Don’t worry about the insulation board; it has no play in a fire-separation wall. Firewall separation (or fire barriers) between two rooms requires a 1-hour or 2-hour fire-rated wall assembly, depending on the AHJ. This typically consists of 5/8-inch Type X gypsum board (fire-rated drywall) attached to both sides of wooden or steel studs(both rooms), with all joints taped, seams mudded, and penetrations sealed with fire-rated caulk.
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Awesome that is what i was looking for! thank you!