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Author Topic: Roof Bubble  (Read 1325 times)

Doc Roads

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Roof Bubble
« on: January 20, 2020, 02:04:15 PM »
I was up on the roof of my 2015 Adventurer 37F and noticed what appeared to be some lifting of the surface on the roof.  I pushed on it and there was some give, however there are no cracks or splits in the surface.  It appeared to be the outer layer was lifted a bit.  The size is about 3-4 inches across.  I know this is not good ... so whatís happening and what can I do about it?

Any ideas would be greatly appreciated ...

Doc
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JackL

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Re: Roof Bubble
« Reply #1 on: January 20, 2020, 02:42:22 PM »
If it was mine, and it only lifts a tad, (1/4" or so) I would just circle it with a marker and keep my eye on it.
 If it gets larger, I would cut it out and if the under surface is dry and has nothing wrong with it, after cleaning it good with alcohol, just put a peel and stick patch over it, with a little self leveling Dicor around the patch edges.

Jack L
« Last Edit: January 20, 2020, 02:45:11 PM by JackL »

Doc Roads

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Re: Roof Bubble
« Reply #2 on: January 20, 2020, 06:43:42 PM »
Thanks ... I have no idea how long itís been this way ... Iím going to watch it closely ...
Still not sure what is causing it ... any other insights?
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HappyWanderer

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Re: Roof Bubble
« Reply #3 on: January 20, 2020, 09:06:32 PM »
It's not unusual for bubbles to appear, but keep an eye on it - repairs are in order if it grows. We had to have major repairs done after a large section of rubber separated, then a leak developed.

A small area can be repaired by cutting a small slit in the rubber to gain access, gluing the rubber back down, then covering the slit with Eternabond tape.
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Doc Roads

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Re: Roof Bubble
« Reply #4 on: January 20, 2020, 10:32:59 PM »
Thanks JL & HW ... I will continue over watch ... I want to nip this problem in the bud ... as usual, early detection is the key ! 😁
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John Canfield

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Re: Roof Bubble
« Reply #5 on: January 21, 2020, 07:22:28 AM »
That's probably the Filon veneer separating from from the luan backing. If it bothers you enough you could drill a small hole in one or two places and inject epoxy - this might stop any further delamination. This technique is rather common with marine repairs. I remember reading about one guy that got an incrediable deal on a 40' Valient sailboat because the deck material was separating from its core material. The guy drilled about a thousand holes in the deck and injected epoxy, I don't remember any other details about the repair unfortunately. He got a $100K boat for peanuts.
--John
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Gary RV_Wizard

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Re: Roof Bubble
« Reply #6 on: January 21, 2020, 09:04:33 AM »
Quote
I know this is not good ... so whatís happening and what can I do about it?
Probably not "bad" either.  You have a fiberglass roof membrane and the fiberglass itself is watertite as long as no holes or cracks. It's not real unusual for a small area to be inadequately glued down and the roof material makers don't insist on it for warranty purposes either.

The only real concern is whether water has somehow penetrated underneath and caused the glue to fail there. Thus the advice to keep an eye on it to see if it spreads or the substrate gets soft. If it doesn't, no worries.  However, if there is water penetration the section needs to be cut out, the area repaired underneath, and then the section glued back in and sealed at the edges. All this after finding and fixing the source of the leak, of course.

Others have described a way to fix it cosmetically so I won't repeat. You can choose to do it or not, at your whim.
Gary
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Doc Roads

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Re: Roof Bubble
« Reply #7 on: January 22, 2020, 01:04:09 PM »
Thanks John et Gary!  I need to check the area around it for possible entry points and continue to monitor for growth and/or softening ... Thanks to all ... appreciate the insights and your experience!
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John Canfield

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Re: Roof Bubble
« Reply #8 on: January 23, 2020, 07:36:15 AM »
The roof sandwich (top down) is:

Filon
luan (1/8" 'plywood')
Styrofoam
luan
headliner

There are also structural elements in the roof. I would go ahead and inject epoxy under the Filon to get it bonded back to the luan. Moisture will ultimately penetrate the walls and roof, Ive found many rusted fasteners in sidewalls. It just happens, maybe through osmosis or ??
--John
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Doc Roads

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Re: Roof Bubble
« Reply #9 on: January 23, 2020, 10:25:35 PM »
Good point John ... what brand of epoxy do you recommend?
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John Canfield

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Re: Roof Bubble
« Reply #10 on: January 24, 2020, 07:10:57 AM »
The WEST system is the gold standard for all manner of epoxy and fillers. They might even have the syringe for injection, haven't looked at their site in a while. They have fast cure and slow cure hardeners. Their epoxy without fillers is not very viscous so it can be used in a syringe.

It's not cheap but it is the best.
--John
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Gary RV_Wizard

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Re: Roof Bubble
« Reply #11 on: January 24, 2020, 08:07:05 AM »
You don't need an epoxy to bond the roof sheet to the substrate.  You aren't repairing the actual fiberglass - just sticking it in place.  You just need a quality adhesive.  One of the products made for installing RV roof membranes (any type) is Cofair's Quick Roof Extreme.

https://www.homedepot.com/p/Cofair-6-in-White-Quick-Roof-Extreme-Adhesive-for-RV-UBE625/305227631

There are also adhesive products from 3M, Henry's, Liquid Nails and others.
Gary
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John Canfield

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Re: Roof Bubble
« Reply #12 on: January 25, 2020, 07:04:35 AM »
The point of epoxy is it can be injected in a tiny hole - if you want to slit the Filon and peel it back then the choices of adhesives is endless. If this was my roof, I would inject epoxy.
--John
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Gary RV_Wizard

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Re: Roof Bubble
« Reply #13 on: January 25, 2020, 08:12:02 AM »
I brought that up because it's "liquid adhesive" that is the important aspect for injection, not the fact that it is an epoxy.  Many flooring and laminate adhesives are sufficiently liquid to be injected.  Urethane adhesives too.  Heck, even Gorilla Glue would work.

Agree that injection is a good method for small areas like this one (3-4").  Injection is a PITA for large areas, though, so a slit works better. Don't necessarily have to peel it back - just raise enough to get a nozzle or broad putty knife under it.
Gary
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John Canfield

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Re: Roof Bubble
« Reply #14 on: January 26, 2020, 07:14:24 AM »
The advantage of epoxy is it will be absorbed into the wood unlike other adhesives. WEST is an acronym for Wood Epoxy Saturation Technique.
--John
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Doc Roads

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Re: Roof Bubble
« Reply #15 on: February 01, 2020, 01:44:57 PM »
Thanks for the information on the alternatives ...John and Gary, I appreciate the discussion on alternatives because this may not be the last irregularity on the roof!

-doc
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Neal

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Re: Roof Bubble
« Reply #16 on: February 01, 2020, 07:12:47 PM »
Sounds from above, it may be easier/cheaper to repair yourself but,
what kind of warranty does it have?
Our 2008 Winnebago Journey, I think had 10 year labor and roof skin warranty.
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Gary RV_Wizard

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Re: Roof Bubble
« Reply #17 on: February 02, 2020, 09:53:11 AM »
Quote
Our 2008 Winnebago Journey, I think had 10 year labor and roof skin warranty.
I think you will find that warranty covers only the material itself and not the installation of it. Here's an excerpt from one 2004 owner manual:
Quote
Winnebago  warrants  the  aluminum  roof  skin  to  the  first  retail purchaser...   The aluminum roof skin will not rust, rot, corrode, or require painting or  refinishing  (normal  pigmentation  change  excepted)  under  normal  conditions of use.
Oddly, I did not find a similar statement in more recent owner manuals. Have they dropped the 10 year coverage?
« Last Edit: February 02, 2020, 09:56:03 AM by Gary RV_Wizard »
Gary
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John Hilley

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Re: Roof Bubble
« Reply #18 on: February 02, 2020, 11:29:55 AM »
I didn't know Winnebago had any aluminum roofs and I'm sure the OPs roof is Fiberglas
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nvrver

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Re: Roof Bubble
« Reply #19 on: February 02, 2020, 12:14:12 PM »
I didn't know Winnebago had any aluminum roofs and I'm sure the OPs roof is Fiberglas
Our 1990 SuperChief had aluminum roof.  All Winnies we have owned since 2003 are fiberglass.
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SLOweather

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Re: Roof Bubble
« Reply #20 on: February 02, 2020, 12:36:21 PM »
Our 1990 SuperChief had aluminum roof.  All Winnies we have owned since 2003 are fiberglass.

Our 88 Suncruiser as well had an aluminum roof.
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John Canfield

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Re: Roof Bubble
« Reply #21 on: February 03, 2020, 06:58:24 AM »
Take a couple of high resolution photos of your roof bubble and send it to Winnie Owner Relations, maybe they can help you out or at the very least provide repair advice. I suspect their answer about a repair will be on your nickle and they recommend replacing the entire roof. Just a guess though, worth pursuing.
--John
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Gary RV_Wizard

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Re: Roof Bubble
« Reply #22 on: February 03, 2020, 08:24:27 AM »
Lest anyone think I'm nuts, the warranty excerpt I quoted above is from the owner manual of a 2004 Itasca Sunstar (link below).  Yes, some models had aluminum roofs rather then fiberglass.   In any case, the point was the warranty statement rather than the material and the warranties are the same whether fiberglass or aluminum.   It covers defects in the roof skin, not the installation process.


https://winnebagoind.com/resources/manuals/pdfs/Operator2004/04Sunstar.pdf
Gary
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John Hilley

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Re: Roof Bubble
« Reply #23 on: February 03, 2020, 11:24:24 AM »
This is from the 2015 Adventurer Brochure

"Fiberglass Roof

The crowned, one-piece fiberglass roof is backed by a 10-year limited parts-and-labor roof skin warranty"


https://winnebagoind.com/binaries/content/assets/brochures/2015/2015-adventurer-digital.x.pdf
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Old_Crow

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Re: Roof Bubble
« Reply #24 on: February 04, 2020, 10:51:45 AM »
I know my bro-in-law got caught in a big storm somewhere in Oklahoma in his '00 Sightseer.  Left about 10 feet of his fiberglas roof in the parking lot of a Flying J.
The repair shop stripped the rest of the fiberglas off, repaired all the substrate damage, fabricated curved flashing for the edges and installed a rubber roof. 
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Five2o

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Re: Roof Bubble
« Reply #25 on: February 04, 2020, 08:43:00 PM »
When I developed a large bubble in my roof of my 2010 Ellipse in the first year I owned it Winnebago replaced the roof. Shortly after every luan joint telegraphed and by last year I had 3 more roof bubbles one of which is 2'x2'. I talked to Winni about it but they said I got one roof so I'm on my own on this roof lol.

I make sure to redo the seam sealants every 6 months or so and will just keep going till the bubbles get way too large. So the warranty is not too iron clad it seems.

SCVJeff

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Re: Roof Bubble
« Reply #26 on: February 11, 2020, 12:54:36 AM »
I have several places that are lifting. While i donít like it much I donít think its a big deal since the edges are sealed.

What IS a big deal is  1/2 KW of Solar panels stuck to the roof. Because of that i think ill map out the steel up there and manufacture SS strips to match the inner frame, rivet and seal
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John Canfield

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Re: Roof Bubble
« Reply #27 on: February 11, 2020, 07:46:46 AM »
You can probably get Owner Relations to email you a structural diagram of the roof. I wonder if the absorbed heat of the solar panels is contributing to the Filon separating from the luan ply?
--John
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