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We are renovating a full gut 4 family house. We are installing fire sprinkling system everywhere in the building. Suddenly my architect is saying we need to isolate each floor by installing 2 sets of 5/8″ sheetrock then drop the ceiling using 2 by 4s then the finishing sheetrock. Architect also said we can’t use the bays between the old joists for anything like recessed lighting or wiring.This sounds crazy to me. Not only that it is costing us more money, it is also making the ceiling way lower.

Did anyone had to do a 3 or 4 family recently? did anyone hear of this building code?

your help is greatly appreciated.