I'm editing a specification section on Plastic Countertops and have the option to include a fire-retardant core if required. Has anyone seen this required before and if so where?
I have only known the use in the case of a building code requirement for protection of interior finishes where the substrate of the plastic laminate needs a fire retardant or non-combustible material to determine an acceptable smoke and flame spread index from the ASTM E 84, Standard Test Method For Surface Burning Characteristics of Building Materials tests.
Per the 2018 NFPA 101, Section _.3.3 of the occupancy chapters 12 through 42 have the provisions for the protection of interior finishes. The exposed surfaces of walls, ceilings, and floors within buildings as defined in 126.96.36.199 are the interior finishes requiring testing in accordance with 10.2. Furnishings were not included.
The tests of interior in accordance with Section 10.2.1.1 are to be made simulating actual conditions. What I have found reviewing that fire testing documents for common plastic laminates alone will not provide the flame spread and smoke indexes for the occupancy chapter requirements as determine from the ASTM E 84 test without the laminate being bonded to a substrate such incombustible cement board.
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