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Re: Take the old off or leave it on ,that's my question
your right
if you use osb most standards call for a min 5/8's deck with clips, if using plywood 1/2" clipped is the norm, but some areas will also accept a 7/16" deck. as noted look inside your attic to see what you have, as both have been commonly used for for decks since the '80's.
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