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Message: <blockquote data-quote="TheGrandestPoobah" data-source="post: 494957" data-attributes="member: 31866"><p>I made a whole little chart with cost and lbs/ft2 of decking material to help me decide.  1/16 frp is about the lightest thing I could think of, and it's $20 a sheet.  my only thought with doing .050 aluminum sheet is that I thought it might help add back some rigidity if I want a really wide open floorplan.   Flooring will be secured down to the ribs with rivnuts, as I want everything underneath to be inspect-able and cleanable without cutting all my hard work apart.  I'm not 100% anti-wood, but generally trying avoid it where it makes sense.  By my quick math, frp saves about 7.5 lbs over 1/4 BCX, not counting weight of epoxy to seal the wood.  .050 would be almost exactly the same weight as the wood.</p></blockquote><p></p>