NFPA 13, Section 188.8.131.52.1 exempts sprinkler coverage in bathrooms that do not exceed 55 square feet and have walls and ceilings of noncombustible or limited-combustible materials with a 15-minute thermal barrier rating, to include the walls and ceiling behind the tub/shower.
My question is - would a plastic shower assembly that has been tested in accordance with ASTM E162 and is classified as a Class II or Class B material be capable of providing the 15-minute thermal barrier alone?
Or, would a separate material still be needed behind the tub/shower assembly?
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