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Message: <blockquote data-quote="TMO8853" data-source="post: 496515" data-attributes="member: 23466">As everyone mentioned, make sure you put the rigid insulation foam in between the ribs. It's the pink stuff that comes in 4x8 sheets if buying from Home Depot (at least in my area). .090 aluminum is a common floor thickness because it's also the common thickness that a lot of drop-in hatches are made from. You can then put the hatch right up to the .090 deck and it's a seamless transition. This would only apply to a raised casting deck, but would still definitely work for a bottom floor. Also, I would attach the flooring to the ribs with counter sink aluminum rivets. You drill your holes in the aluminum, then take a counter sink bit and counter sink the hole and then when you install the counter sink rivet it sits completely flush. That way, if you ever go to put vinly or turf down its a completely smooth surface.</blockquote>