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Old 12-15-2018, 04:12 PM   #3
JRTJH
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Join Date: Mar 2011
Location: Gaylord
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I can think of two problems you'll face right off the bat:

1. Plywood is far too heavy to use and once it gets wet, even heavier.
2. Plywood is not waterproof, once it gets wet, it will start to rot/deteriorate. Even marine plywood is not "completely resistant to the damaging effects of water".

Coroplast is a corrugated plastic sheeting that is lightweight, not affected by water and much more durable as an undercover than wood.

Another product, DARCO, is a plasticized fiber sheeting (think blue plastic tarp) that would also provide a suitable underbelly covering. In fact, it is used by many (probably most) RV manufacturers to line the wheelwells in towable RV's.
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