Technical discussion: Fire resistance rating of warehouse roofs

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This post was last edited by hesonchang214 on 2016-4-30 at 11:18 / The fire resistance rating for Class B warehouses can be Grade 2 or Grade 3. So, what is the fire resistance rating requirement for warehouse roofs? I see that many designs use 60mm glass wool sandwich panels. Case: There is a Class B warehouse equipped with sprinklers, featuring numerous holes around it; its roof is designed as a sandwich panel but actually has single-layer colored panels installed. How can approval for acceptance be ensured? Option 1: Replace the roof with sandwich panels ； Option 2: ? Is the use of sandwich panels a requirement for the fire resistance rating? If so, can applying fireproof paint solve this problem? Question: The fire resistance rating of this roof has little practical significance (except as required by regulations), because: whether a fire breaks out inside or outside the warehouse, it will affect both the exterior and interior of the warehouse through the openings... /