A structural component of the roof of a building. The deck must be capable of safely supporting the design dead and live loads, including the weight of the roof or waterproofing system, and the additional live loads required by the governing building codes and provide the substrate to which the roof or waterproofing system is applied. Decks are either noncombustible, (e.g., corrugated metal, concrete or gypsum) or combustible (e.g., wood plank or plywood).

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