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Message: <blockquote data-quote="shawnfish" data-source="post: 327865" data-attributes="member: 4468">you could use aluminum for the deck and wood for your support/frame  but remember the wood will not last as long as the aluminum.you could also consider building the support/frame out of aluminum angle or square tube and rivet it together and then use ply for the deck and save money. and if you do use aluminum for the deck 1/4 inch is way to thick in my opinion and it will add lots of unwanted weight.  I would use like .90 guage for the deck and maybe smaller. theres not a lot of square footage up there so your framing/support wont have to be very extensive to keep a sheet of ply or aluminum from flexing with you up there....</blockquote>