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Message: <blockquote data-quote="Buster" data-source="post: 520859" data-attributes="member: 27745"><p>Just used 1/2 Coosa for a casting deck.  I gave it a layer of 6 oz fiberglass on each side and It's solid on a 16" span.  As far as aluminum, there's no reason to even consider 1/4". My entire boat is 1/16, and you could go with that if you have foam under it.  .090 would work fine if you don't but if you're a big guy, you need big spans, or you just want to add weight for no good purpose, .125 is more than enough.</p></blockquote><p></p>