| mysterious leaks in roof [message #140101] |
Fri, 19 August 2011 19:56  |
glacierfl
Messages: 444
Registered: June 2011
Karma: 0
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Senior Member |
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Hello,
After aquiring a 77 palm beach, the rain "Florida"!!, started getting into the coach. There were obvious leaks due to the windows needing re-sealing, and a few leaks i could not find.....
We are redoing the roof panels , decided on formica sheets, because you can get so many colours, patterns, and also because of its strength.
After i took some of the old card panels down, i noticed something strange. In various places where fitments were screwed into the roof from above, the foam insulation had been forced out of place, or was totally missing with sillycone that was not doing anything at all !!!!. So basically in various places the water was finding a path inside, running down the screws.....
I decided the best way of stopping this was to strip the foam away from any screws i could find and respray with insulating foam sealant. The theory being if you seal the screw area and the screw still allows water into the fixing hole/s, it cannot go anywhere because the foam sealant stops it getting into the roof space. It may pool a little around the screw but has no acess into the vehicle.
I did wonder when fitting new screws if one should spray foam sealant into the screw holle so it would expand and fill any void....., perhaps better than sillycone because it expands.
Well i would appreciate any comments on this issue, and if anyone sees a problem with this idea please put your comments up.
Regards
Steve & Debbie
Monticello, FL
77 Palm Beach :- Aurora
EX G4WDT
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| Re: [GMCnet] mysterious leaks in roof [message #140112 is a reply to message #140101] |
Fri, 19 August 2011 20:20  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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The foam will probably not stop the leak around the screws. I would remove the foam as you did then clean the underside of the roof panel as well as the protruding screws/rivits, whatever with a wire brush and follow that with cleaning solvent. Once dry, apply autobody seam sealer (most one component products work well, stay away from tooth paste tube types and sillycone) liberally to the protrusion and pack it around best as possible with an acid brush or small stiff bristled paint brush. Don't even think about re installing your new panels without leak checking first. This is easily done by flooding the roof with water while looking from inside. Leak repair procedure:
1 find the leak (flood with water)
2 repair the leak
3 check that the repair worked
4 wait and stare at the repaired leak area with water flowing to be sure it doesn't have company
5 close it back up
Lots of times while fixing leaking vehicles I have spotted something that I am sure is the culprit only to find out after checking that there are more leaks and sometimes the "obvious" spot is dry
Jwid
Sully
77 royale
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: steve & debbie <zzdebz@yahoo.com>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Fri, 19 Aug 2011 19:56:00
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: [GMCnet] mysterious leaks in roof
Hello,
After aquiring a 77 palm beach, the rain "Florida"!!, started getting into the coach. There were obvious leaks due to the windows needing re-sealing, and a few leaks i could not find.....
We are redoing the roof panels , decided on formica sheets, because you can get so many colours, patterns, and also because of its strength.
After i took some of the old card panels down, i noticed something strange. In various places where fitments were screwed into the roof from above, the foam insulation had been forced out of place, or was totally missing with sillycone that was not doing anything at all !!!!. So basically in various places the water was finding a path inside, running down the screws.....
I decided the best way of stopping this was to strip the foam away from any screws i could find and respray with insulating foam sealant. The theory being if you seal the screw area and the screw still allows water into the fixing hole/s, it cannot go anywhere because the foam sealant stops it getting into the roof space. It may pool a little around the screw but has no acess into the vehicle.
I did wonder when fitting new screws if one should spray foam sealant into the screw holle so it would expand and fill any void....., perhaps better than sillycone because it expands.
Well i would appreciate any comments on this issue, and if anyone sees a problem with this idea please put your comments up.
Regards
--
Steve & Debbie
Monticello, FL
73 Glacier
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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