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Old 08-18-2016, 05:39 PM   #29
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1971 25' Tradewind
1993 34' Excella
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Estancia , New Mexico
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Rot begins in the corners and edges of plywood. I don't see any reason to seal the whole sheet.

Sail on silver girl. Sail on by. Your time has come to shine.
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Old 08-18-2016, 07:11 PM   #30
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1974 27' Overlander
Baltimore , Maryland
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Originally Posted by HolyRoller View Post
If you actually seal the underside of the subfloor you risk capturing the moisture indefinitely (vented or not).

This will guarantee rot that comes from the inside out.
I disagree. When sealing any sheet of wood, it's typical to seal both sides evenly, else any changes in humidity cause the unsealed side to expand or contract, which warps the wood. With the wood bolted to the frame, it probably wouldn't bend, but it might crack, which would defeat the seal and weaken the piece. I would suggest it's best to totally encase the wood if you have the opportunity. Just my opinion.

I went to some great lengths to avoid recurrence of rear floor rot. Sealed entire floor in west system epoxy, wrapped rear edge of plywood in a butyl window gasket called Protecto-wrap, added a piece of aluminum to deflect water, and re-engineered the bumper lid attachment to direct water through the bumper compartment to the ground rather than under the plywood floor.

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Old 08-18-2016, 08:31 PM   #31
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1973 23' Safari
1970 27' Overlander
Boerne , Texas
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Greatleys - I am working on this bumper issue - I have made the flashing as described above. I would love to hear how you modified your bumper/trunk area to keep water out.

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