| Protecting subfloor from water damage [message #343794] |
Wed, 29 May 2019 14:01  |
Angel Rodriguez
Messages: 22
Registered: June 2018
Karma: 0
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Junior Member |
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Hi all,
So I've spent last month sealing the roof and windows of my GMC. The last couple of weeks have been rainy and a perfect time to test if my seals are working. So far so good.
After driving around for a bit I noticed the subfloor around the wheel wells was soaking in water. Turns out the subfloor is completely exposed behind the rear wheels.
Has anyone tries to seal this area from the elements?
Angel Rodriguez
San Jose, CA
1978 23' Birchhaven
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| Re: [GMCnet] Protecting subfloor from water damage [message #343795 is a reply to message #343794] |
Wed, 29 May 2019 14:19  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Yes. Wheel splash from the inner fenders is the culprit. We have used
sealant tape that is made for roof seams on RVs. The stuff I used is $$$$$.
Like $10.00 a foot. It is available in various widths, and I used the stuff
that was about 6" wide to cover where the floor meets the inner fender. I
had the bogies out when i did this, so i could run a continuous patch along
the entire dual wheel well. I pressure washed the inner fender and bottom
of the coach floor under the coach. I then sprayed a similar product, made
by Rustoleum, to the stuff you see on TV that you can make a screen door
float with. It is product # 265494. LEAKSEAL flexible rubber coating. I
painted 2 or 3 coats, let it cure, applied the seam tape, and top coated
the tape and complete inner fender areas. Customer says no more leaks
there. His is a 73.
Jim Hupy
On Wed, May 29, 2019, 12:02 PM Angel Rodriguez via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Hi all,
>
> So I've spent last month sealing the roof and windows of my GMC. The last
> couple of weeks have been rainy and a perfect time to test if my seals are
> working. So far so good.
>
> After driving around for a bit I noticed the subfloor around the wheel
> wells was soaking in water. Turns out the subfloor is completely exposed
> behind
> the rear wheels.
>
> Has anyone tries to seal this area from the elements?
>
>
> --
> Angel Rodriguez
> San Jose, CA
> 1978 23' Birchhaven
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: Protecting subfloor from water damage [message #343800 is a reply to message #343794] |
Thu, 30 May 2019 02:24 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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That stupid leak drove me nuts for many years. Then I realized that it only leaks when you drive in the rain. I got the same Rustoleum product (same as Flexshot) and sprayed all around that seam. It took slightly less than one can per wheel. I finished it with a roll of 6" wide aluminum at Menards and glued a splash shield all the way around in front of that seam. I also used a few wood screws into the edge of the floor to make sure that the shield would not go away some day.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Protecting subfloor from water damage [message #343803 is a reply to message #343800] |
Thu, 30 May 2019 08:17 |
Justin Brady
Messages: 769
Registered: April 2015
Location: Bell Buckle, TN
Karma: 11
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Senior Member |
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When I redid mine I put several thick layers of deck sealing outdoor paint on the plywood around the wheel wells, and resealed the wells to the floor. No leaks that I've noticed, but I do like the idea of putting a tape seal over the whole thing. I always thought that was a very poor design to have end grain exposed in the wheel well like that! Would have been simple to put in an aluminum channel in the design phase to avoid exposed wood in such a water soaked area.
Eternabond should do the trick I'd think
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
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