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Old 06-23-2020, 08:25 PM   #1
Junior Member
Join Date: Jun 2020
Posts: 8
Question Lower Rear Wall Rebuild

Fellow RVers,

I need your help with a beautiful 1997 Winnebago Adventurer with some fairly extensive water damage.

(Please reference the pics to see what I'm talking about.) I removed the bottom part of the rear wall filon because the wood was more than rotted. In the pics you can see a metal sheet at the very bottom of the rear wall which stretches from the right to the left side. The rear filon piece also tucks into the bottom of the metal piece which is like a "u" shaped channel.

As you can also see it has some holes in it. When I took it apart, it was mostly empty space with some rotted wood pieces sitting in its bottom channel.

Now I'm wondering the best way to put it back together.

I was going to fill it with a 1"x8" but the problem is there are holes drilled in its bottom channel. Therefore the holes will allow water to touch the new wood and cause it to rot, probably pretty quickly.

Do I put a layer construction adhesive in the channel to cover the holes and then attach the wooden board to the metal sheet?

The problem I see with sealing the holes is water coming down from the rear filon wall is bound to collect in the bottom channel (even though I will try to seal it).

Do I put a few inches of foam in the bottom channel and wood above that, with the hope that the foam would stop the water from touching the wood?

But how do I make the foam apart of the wall, since any luan that would connect the foam to the rest of the wall would be ruined very quickly.

This is why I need your great ideas, please liberally share them, they will be greatly appreciated!

Thank you!
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Old 06-23-2020, 09:21 PM   #2
Senior Member
Join Date: Jan 2020
Posts: 565
I believe those are drain holes to allow water that has gotten in from running down the filon and into the u channel. If you lift your storage compartment doors, there will be holes in the bottom of them too. I would not seal them up. If anything, as you have proposed, allow a small space between the wood bottom and the channel bottom so water could freely run out. Might get some fiberglass resin and coat both sides up several inches from the edges and the ends really good, of any wood you use to seal the wood to protect the wood from water seeping up. Possibly instead of foam, use blocks of hardwood as spacer blocks and resin soak them to make them water proof
2001 Winnebago Brave SE29 Workhorse P32 7.4L (previous)
2007 Fleetwood Bounder 33R, F53 chassis, V10 (current)
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