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Date Posted: - Tuesday - 01/13/09 - 11:18pm
Author: Steve M-32
Subject: Ply voids
In reply to: Lyle Harris 's message, "Cockpit & deck plywood" on - Tuesday - 01/13/09 - 12:34pm

The problem with the cheaper grades is voids in the inner ply's. A void will allow the board to flex and crack when it is stepped on which will in turn allow the glass to crack which allows water into the ply and if water gets into a void it is the perfect environment for rot to develop. You don't need that many sheets of ply. Given all the labor that goes into a rebuild of one of our boats I think it's the wrong place to try and save money.

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[> [> [> [> [> [> Marine plywood -- Dan, - Thursday - 01/15/09 - 12:22am

Don't confuse building grades of fir ply with marine grade. Marine grade fir ply has no voids. That being said , I think the imports, okoume(also known as gabon) and meranti are better. They have more laminations and are probably more rot resistant. Check out Noah's-
http://www.noahsboatbuilding.com/noahusa/items.asp?cc=33&bc=

I'm getting ready to do my decks and cabin also.
Dan


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