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Old 12-30-2003, 07:36 AM
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Location: Ithaca, NY
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Default RE: Building Giant scale Question

A 3/4"x4x8 sheet of MDF(medium density fiberboard) is dead flat, unlike plywood, and will remain flat in different temperature and moisture conditions better than plywood or particle board. If put over a frame with enough cross pieces you should be able to shim it level/flat and then put a 1/2"x4x8 sheet of homosote on top. This would cost me about $50 in my neck of the woods.