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Were building a porch addition which will have a metal roof. Can OSB be used as a roof decking, to save on costs, or is Plywwod the safer bet. The roof will be a standing seam type.
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With most metal roofing you can use either. You may want to check with the manufacturer of your particular standing seam type.
As a rule plywood is stronger, and provides better holding power for the roof fasteners. If you go with OSB you may want to consider using a thicker material.
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