Best Reason to Avoid Sealing Bottom of Plywood Siding – Water Damage Prevention Click on this link for more information about wood rot and water damage. Watch this video if you are planning on installing plywood siding. Plywood siding can easily be damaged by painting or sealing the bottom in a manner that would not let moisture escape when absorbed into the wood. Remember, if something isn’t a common construction practice or method used by experienced homebuilders, then you might consider thinking twice before thinking your idea might be better than someone else’s.

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