I have a 29 x 72 mobile office with a 2-foot wooden truss above the ceiling that a client is required to sprinkler. Is there any way to avoid sprinklering above the gypboard ceiling?
From Rodney A. McPhee, CET, CIP, SFPE- Manager, Building Codes, Canadian Wood Council: “In North America, NFPA 13 allows for such spaces in sprinklered buildings to not have to be sprinklered if the space is filled with noncombustible insulation or to have the wood materials coated with a fire retardant paint or pressure impregnated fire retardant chemical (Flame Spread Rating 25 or less)”. Since this property is presumably already constructed, you’re likely to have to remove the ceiling, giving you three choices: sprinkler the space, fill it with noncombustible insulation, or paint the trusses and wood deck with FR paint.
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