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Message: <blockquote data-quote="Azdesert" data-source="post: 510886" data-attributes="member: 34734">With that method getting to the hull would be a issue. Typical subfloor is only .030 so not much weight, the two floors and framing is still less then a 3/4" plywood floor, certainly more costly too. In the OP's case he is going to use .060 on the subfloor, so a little heavier. Normally the foam is poured and then cut to fit after it cures. I just put in a couple of .090 pieces today on a side panel and the framing still needs to be close to a foot apart to keep it from getting beat up. Those hot wire cutters are a great tool to have if you do much of that work, or even for one project it could be worthwhile.</blockquote>