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Thread: roof water leak

  1. #11
    Join Date
    Nov 2006
    Location
    Huntsville
    Posts
    3,135

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    Thanks Joe. I'll start watching for a blower unit.
    Dale & Paulette

    "God Loves you and has a plan for your life!

  2. #12
    Join Date
    Sep 2014
    Location
    The Villages
    Posts
    41

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    You may want to check the awning mounts for being loose. I have found several where the awning mounts were the issue.

    Mikee

  3. #13
    Join Date
    Jan 2007
    Location
    Brooksville, Fl. & Franklin, N.C.
    Posts
    1,600

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    AMIGOMILLERS, Keep us updated on this water leak so we can all learn and help each other.

    99 Country Coach 45XL
    Jeep Liberty

  4. #14
    Join Date
    Sep 2013
    Location
    Frankston
    Posts
    13

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    Unfortunately I have that same water leak on the window treatments in my 02 Royale. I've tried sealing everything I could above that second window drivers side but to no avail. Thought I had it fixed but while in an rv park yesterday in a big downpour, the leak is back - with a vengeance. Likely the roof A/C seal as suggested above. I'm going over to Prevost Ft Worth and have them do their leak check. Thanks for all the input.

    Rich Potter
    2002 Royale
    2014 Grand Cherokee

  5. #15
    Join Date
    Mar 2018
    Location
    Los Altos
    Posts
    1

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    I have the same exact leak (behind drivers seat) in my 01 Marathon - no roof a/c. I just bought this thing last month and spent a ton fixing it up and on our first rainy night with the kids, this happens!? We were planning on going cross country and now have to turn back. Sooo frustrating. Is this a common problem with Prevosts?

    Could anyone please recommend a shop in California that would do a good job sealing the whole roof? Wanna make sure this doesn’t happen again.

    I called Prevost in Mira Loma and they’re booked out for weeks.

    Any help would be greatly appreciated. Thanks

  6. #16
    Join Date
    Dec 2017
    Location
    New Braunfels
    Posts
    13

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    Talk with Jim Purcell at CoachPro LLC in Oregon. Jim sanded and sealed the roof of the Marathon XLV I just bought with EDPM two part epoxy roof coating. The specs on it are pretty dare good. I have also seen where folks spray their roofs with white bedliner. Everything has to come off to do the job right. Maybe a trip to Oregon is what the doctor would order;-).

  7. #17
    Join Date
    May 2012
    Location
    Beverly Hills
    Posts
    4,652

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    Robert,

    There are few places for the leak to originate. So, it should be a job and competent RV place can handle that works on any high end RVs.

    Your coach should have a one piece aluminum roof with a perimeter rivet line and possible a rivet line in a couple of feet from the front and back. All caulk joints need periodic inspections and resealing. I'd pay particular attention to the front cap to roof seam.

    Of course, there will the converter made penetrations. Some will install an extended trim on the roof the length of coach. Your awning mounts are another must inspect location.

    Resealing penetrations is not a big job, certainly not big enough to disrupt your trip. Doing a roof coat will take a little more time, but not a lot.


    Gil and Durlene
    2003 H-3 Hoffman Conversion

  8. #18
    Join Date
    Mar 2017
    Location
    Kerby
    Posts
    154

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    Roof leaks of this type are a common Problems in the GMC motorhome community. These, too, are metal (aluminum in that case) monocoque structures with the external aluminum panels glued to the stringers. The common leak points are the seam between the front and rear caps and the roof panels, the seam between the side panels and the roof panels, the clearance lights, the roof pod, roof rails and ladder mount and the awning mount points. The solution requires removing the 40+ year old sealants, cleaning well and resealing with a self leveling polyurethane caulk. Never use silicones as the bond between the silicone and the painted metal panels can release as soon as the UV light hits the silicone allowing water to flow under the silicone even though it looks fine.

    while we had no active leaks when we purchased our XL, there were signs of previous leaks. We had the roof recaulked with polyurethane and then had the whole roof coated with a white elastomeric roof coating similar to what is used on commercial buildings. The elastomeric provides a positive water seal while also keeping the interior cooler and quieter. From the ground you cannot see the white coating on the roof. Total cost was $750 with someone else doing the work (I don’t go on the roof anymore)! The materials can be purchased on line, at many big box stores or at commercial roofing suppliers.

  9. #19
    Join Date
    Mar 2017
    Location
    Kerby
    Posts
    154

    Default

    One more thing. A blower is also used to find leaks on GMC Motorhomes. There the blower is mounted to the drivers side window and tape used to block all the vent openings to pressurize the interior enough for soap solution applied to the outside to bubble at the leak points. Often the rubber seals around the windows will bubble the soap solution even if there is no apparent water leak there. In that community it is really hard to observe the path of the water so where it comes inside may have little to do with where the leak actually originates. So, with something as large as our Prevost coaches I think it will be really hard to find the actual source of the leak. A careful reseal seems to me to be the only successful way to deal with water intrusion. After 20 years of flexing there are just too many places where the water actually enters.

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