Join Date: Sep 2008
Location: Victoria B.C. Canada
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Plywood has enough compressive strength so should be ok. But where each fastener passes through the deck you should overdrill and fill with thickened epoxy before drilling the proper size hole. Here's another good link.
Sealing Deck Penetrations to Prevent Core Rot Photo Gallery by Compass Marine at pbase.com
What kind of boat is it?
Living aboard in Victoria Harbour