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08-29-2007, 10:33 PM
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#1
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Senior Member
Join Date: May 2007
Location: Beaverton, OR
Posts: 2,506
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Possible cause of a leaky roof
I recently developed a leak in my roof after three years; I worked with Peter and his team Fresno through Email so I would not have to make the drive from Portland OR to Fresno. I was able to track the leak to the bolts for the rear latch or Penthouse bed support bolt. As you can see in the picture the bolts are not centered in that section of the roof. When I pulled the fender washers off I noticed that the edges of the washer were in contact edge of the roof section. I figured that this was not letting the washer sit flush to the roof and seal properly. I replaced it with 2â€
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-greg
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"Goldilocks" 2020 Ford Transit High Roof Extended 3.5 EcoBoost AWD Homebuilt
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08-30-2007, 12:04 PM
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#2
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Senior Member
Join Date: Apr 2007
Location: Parker, CO
Posts: 7,644
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If the bolts have been leaking for a long time you will be able to see a rust pattern on the shaft to some extent. My 2005 had 3 bolts that had about 1" of rust/corrosion which is how SMB identified the leaky ones.
They also checked them round robin, not removing anything from the top completely.
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it was good to be back
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05-06-2012, 09:55 PM
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#3
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Junior Member
Join Date: Mar 2012
Posts: 16
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Re: Possible cause of a leaky roof
Never enough time to do it right the first time; always enough time to try to fix it later.
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05-07-2012, 09:37 AM
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#4
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Senior Member
Join Date: May 2007
Location: Washington - Ridgefield
Posts: 4,728
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Re: Possible cause of a leaky roof
In your picture, you can see the butyl is not compressed completely on the left side. Was there a path right through to the bolt?
Mike
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Alaska to Key West, Labrador and more
Prostate cancer survivor. See Thread Prostate cancer and Sportsmobiles
2015 VW GTI 2020 Fiat 124 Spider
2012 E250 Hitop camper
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05-07-2012, 05:36 PM
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#5
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Senior Member
Join Date: May 2007
Location: Beaverton, OR
Posts: 2,506
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Re: Possible cause of a leaky roof
wow this is old, but there was butyl under the washer, the problem is the washer did not sit flat on the roof, and could not compress the butyl for a good seal. My roof has the ribs and the hole was not centered in the middle, so the washer hit the edge of the rib.
It was pretty obvious once I looked closely, but of course the water never came in anywhere close to those holes. but that can be the nature of water leaks.
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-greg
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"Goldilocks" 2020 Ford Transit High Roof Extended 3.5 EcoBoost AWD Homebuilt
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06-18-2012, 07:37 AM
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#6
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Senior Member
Join Date: Jun 2012
Posts: 144
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Re: Possible cause of a leaky roof
Quote:
Originally Posted by Scalf77
wow this is old, but there was butyl under the washer, the problem is the washer did not sit flat on the roof, and could not compress the butyl for a good seal. My roof has the ribs and the hole was not centered in the middle, so the washer hit the edge of the rib.
It was pretty obvious once I looked closely, but of course the water never came in anywhere close to those holes. but that can be the nature of water leaks.
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You got that right. I had a crack in the PH top in the back, but water showed up inside in the front corner.
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06-18-2012, 08:55 AM
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#7
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Member
Join Date: May 2007
Location: Salt Lake City
Posts: 52
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Possible cause of a leaky roof
Re: roof leak and rebuild...
Is there any reason to use butyl preferentially over silicon? I'm looking at re-doing my roof bolts, and wanna figure out the best sealant. I'm open to suggestion.
My thoughts are to use a silicone caulk, but if there are better options, I'll use one.
I am planning on having the roof coated w/ a rhino or similar material.
Thanks
John
03 EB350, 7.3 PSD, Q 4x4
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06-18-2012, 03:02 PM
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#8
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Senior Member
Join Date: Aug 2011
Location: Anchorage, AK
Posts: 205
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Re: Possible cause of a leaky roof
OEM use butyl. So does the windshield replacement folks. Why? Silicone bond does not last to fiberglass or painted metal. Silcone seals will look intact but after a year or less you can usually lift it away from metal or fiberglass easily -so water can easily migrate under it. Butyl will remain soft and adherent for a few years or more depending on sunlight and heat extreme cycling.
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Spenard
1991 VW Westy (N8IV) aka Vanna, of Ashland, OR
2012 Sprinter RB SMB PT (ALCES2) aka Moose, chill'n in Anchorage, AK
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