In most areas I'm having to replace there is the metal frame, then 1/2" plywood, 1" foam, and 3/4" plywood, then the ugly vinyl Newell uses for a vapor barrier. Due to the way I had to cut out the plywood I plan to not use foam and go with 1/2, 1/2, 1/2, and 3/4" plywood for the top layer. It'll be more work fitting the pieces but it should be very solid if I overlap the seams.
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