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Unread 09-29-2012, 02:10 AM   #5
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Join Date: Feb 2008
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If you want something sturdy but lightweight for the foundation, check out insulation foam. It is very inexpensive, lightweight, and comes in large sheets of varying thickness and you can get it at major home improvement stores (it's usually pink or blue). You might still need to use upholstry foam in a few places just for ease of movement and comfort, though.
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