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Old 05-20-2013, 01:47 PM   #1
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Roof question - voids between the rubber and the roof deck?

I noticed today that the roof on my 97 Gulfstream Sun Voyager (34 ft) has some areas near the back along the side where there are large voids between the rubber and the roof deck. By large I mean I measure one spot on the drivers side that is about 36" long where the pocket between the rubber and the deck is about an inch deep. The rubber is intact and nothing has penetrated. I can feel a piece of flashing that rounds off the top edge of the roofline under the rubber that feels like it has pulled up of the deck and is lifting the rubber up.

I could nail/screw it all back down and hit it with Dicor to seal it. I am leery about putting holes in the rubber. Then again, my only other option (I think) is to strip the roof, make it good and then new roof (read: CHA-CHING!)

Any help or advice is welcome.

Jeff
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Old 05-20-2013, 08:53 PM   #2
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I would not be afraid to penetrate the rubber. In fact, I would cut a slit or two so I could peel back the loose material and see what is amiss underneath and fix it properly. When the substrate is repaired, glue the EPDM back down and seal the slit(s) with lap sealant or Eternabond tape (the tape makes a nice clean job and is VERY effective).
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Old 05-21-2013, 09:58 AM   #3
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Just do NOT use silicone on the roof or just about anywhere else in or on an RV. Eternabond or some of the 3M marine grade caulking or some of the caulking from Teakdecking which is what we went with.
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Old 05-21-2013, 10:39 AM   #4
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Just do NOT use silicone on the roof or just about anywhere else in or on an RV. Eternabond or some of the 3M marine grade caulking or some of the caulking from Teakdecking which is what we went with.
I understand why you would not use silicone on the roof, but why not anywhere else on the RV? I've used it on seams, etc under the RV to seal up potential problems. I also used it to seal some small cracks around the windows, body etc. Why is this bad? Thanks.
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Old 05-21-2013, 05:57 PM   #5
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Quote:
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I would not be afraid to penetrate the rubber. In fact, I would cut a slit or two so I could peel back the loose material and see what is amiss underneath and fix it properly. When the substrate is repaired, glue the EPDM back down and seal the slit(s) with lap sealant or Eternabond tape (the tape makes a nice clean job and is VERY effective).
Thanks Gary.

The local RV place said to remove the side rail, peel the rubber back, repair the deck and then reinstall the rubber under the side rail. I would have to redo the butyl tape behind the rail too.

What do you think?

And if I was to glue the rubber back down as you suggest, what would you recommend?

Jeff
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Old 05-21-2013, 08:27 PM   #6
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The silicone just does not move the way it needs to move with an RV. The best thing is to just not use it unless you are using it in a place like a bathroom.
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Old 05-22-2013, 06:40 PM   #7
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Contact cement to repair your roof.
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Old 06-02-2013, 08:34 PM   #8
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Repaired the roof today. I sliced the rubber all the way along where I could feel the flashing had raised up. It was only stapled to the sub plus some contact cement which was no longer doing its job. Staples had come loose all the way along. So I pulled the staples out, put a small bead of polyurethane construction adhesive between the aluminum and the sub and then nailed it back down with some short roofing nails about every 4 inches.

Then I cleaned the rubber real good with acetone and applied some 6" eternabond tape. I did one section on either side near the rear about 10-12' in length and then put a piece that overlapped those two pieces all along the seam at the rear cap.

I can't see it leaking. I was VERY impressed with the Eternabond tape. Super sticky and very high quality product. I'm glad I ordered the 6" long roll. It will come in handy for the seam at the front cap and around the other penetrations (next weekend). Sure beats Dicor and was a snap to install. Only time will tell but it looks a million times better than it did beforehand. Highly recommend it to anyone looking to do any sort of roofing repair!
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Old 06-02-2013, 08:58 PM   #9
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Sounds like a good job, JR.

BTW, I'm sorry I missed your question to me back on 5/21. For some reason I did not get back to this thread until just now.
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Old 06-03-2013, 09:25 AM   #10
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No problem Gary. I looked at the job and decided it was going to be far too difficult to do it the way the RV dealer suggested. I could tell the roof sub wasn't rotted so it was a simple decision to just cut repair and patch with Eternabond.

Oh and the funniest part was the RV dealer had never heard of Eternabond tape. That made the decision to not follow his advice even easier!

Jeff
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