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Old 01-09-2015, 02:07 PM   #15 (permalink)
elhigh
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Those $33 sheets are probably fiberglass-reinforced plastic, intended to install for waterproofing, like lining a shower stall or something similar. Unnecessarily heavy and floppy for what you want to do.

Home Depot (at least in my area) carries coroplast, corrugated twin-wall white plastic sheets, for about $13.50 for a 3' x 6' sheet. They also offer a 10-pack of 4x8, but that's $110, available by special order only, and an awful lot more than you need. Maybe you and two ecomodding friends could go in on a pack?
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