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Rafter vs Deck Mount Spacing Guide by api-253803786 is a document available to read on EtoBox.

Rafter mounts for solar panels must be spaced at multiples of the rafter span, which is commonly 16 or 24 inches. For a 16-inch rafter span, acceptable spacings are 16, 32, 48, and 64 inches. For a 24-inch span, they are 24, 48, and 72 inches. Deck mounts can be spaced at any distance since decking does not have preset locations. Installers should check that listed attachment spacings for rooftop solar projects match the rafter or deck spacing and request changes from clients if needed, as incorrect spacing

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api-253803786

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EN