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Old 12-29-2017, 03:01 PM   #1
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Roof leak/delamination

I posted the other day about a 2” cut in my coach’s TPO roof. It rained pretty hard last week and with Christmas I’m just now getting around to fix it. Unfortunately, the tarp we had covering it got blown off while we were out of town and water got in. The plywood underneath is all wet and soggy in one area and the TPO has bubbled up. The whole area is about 2 sq ft. Water has not penetrated through into the inside from what we can tell. No stains on ceiling. We’re in the middle of a cold snap so it’s gotten below freezing the last few days/nights and is supposed to freeze again this weekend.
How do I fix this? How do I dry it out? Do I have to replace the plywood? I have Marine epoxy from working on our sailboat. I just don’t want it to mold.
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Old 12-29-2017, 03:19 PM   #2
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I am not an expert, but I have replaced our TPO membrane myself, along with a fair amount of damaged luan plywood. Those memories are not fond ones...

All I can tell you is how I'd think about it if I were in your shoes.
1. Yes, I'd want to be sure everything was thoroughly dried out.
2. Is there someplace you can get it indoors temporarily? I replaced my roof during the first part of a November. I rented a heated storage unit that the rig would fit in...
3. If I couldn't get it indoors, I'd be tempted to try to "hold my ground" by protecting it for the remainder of winter until things warmed up (or at least I had a stretch of good weather coming).
4. To be sure everything dried out, I'd probably think of cleanly cutting a flap in the TPO that would hopefully encompass the potentially damaged area.
5. Once dry, see how the plywood is. I can tell you that luan ply and water really don't go well together.... (sorry).
6. After any plywood repairs are done, perhaps re-seal the flap with Eternabond tape.
7. A word about TPO. The older TPO has a felt-like backing that tends to wick water (fantastic idea, right?). New stuff does not...

Just my initial thoughts. Good luck!
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Old 12-29-2017, 03:33 PM   #3
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It’s a 2008. From what little I can see, I think it might have the felt backing. Yay. I’m not sure if there are any climate controlled storage units around here that would fit an RV. I’d have to check.
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Old 12-29-2017, 03:50 PM   #4
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Quote:
Originally Posted by ravenclaw View Post
It’s a 2008. From what little I can see, I think it might have the felt backing. Yay. I’m not sure if there are any climate controlled storage units around here that would fit an RV. I’d have to check.
Please go to your "control panel" and add your year and make of your coach to your signature lines, will give those reading your posts a better idea of what your dealing with.
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Old 12-29-2017, 05:23 PM   #5
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Ok, I did it. It was all in my profile. I use the app so signatures don’t show up, so I didn’t realize it wasn’t.
But do you have any advice on how to dry it out?
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Old 12-29-2017, 05:46 PM   #6
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thankyou
I would get it under cover as soon as you can, then just start drying it out with heat lamps both inside and out.
I'll let someone that has had this problem give you the particulars on how to do the repairs.
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Old 12-29-2017, 05:58 PM   #7
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Don’t have your rig or a tpo roof. I looked into them and learned some about what to do about tears since we live in the woods.

For now I would get the rig out of the weather and or seal the tear with eternabond. You can get a roll on amazon if you can’t find anything locally.

There is much more water in the rig than you expect. I would warm it up enough a real 40 pint dehumidifier will run and get the moisture out before it starts to smell bad and develop mold. Don’t waste your time and money on damp rid.

If I remember correctly you can leave the eternabond as a permanent fix as long as the roof structure doesn’t need repairs.

I keep a roll of eternabond and dicor butyl tape on my rig. Even with fiberglass roof we still took a hit from a tree branch. And I also use it to seal the caps and around stuff on the roof.
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Old 12-30-2017, 11:47 AM   #8
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Back when we had a 5th wheel I accidentally tore some small holes in the roof when I backed under a low tree limb. I didn't know it at the time and a few months later I discovered it while washing the roof. It was obvious what had happened and the roof was very soft around the holes.

Over that period of time water had seeped in through the holes and completely rotted the particle board underneath. Below is how I repaired it.

First, I cleaned the roof thoroughly with Acetone. Then I used a razor cutter and cut two slits in the rubber, extending a couple of inches past the soft spot.


This is what I found after peeling back the rubber! This pic is after I removed handfulls of rotted wood!


I dug out all the rotted wood and cut a piece of pylwood to fit the hole with a couple of inch overlap onto the solid wood, screwing it down. This pic was taken before I put screws all the way around the plywood.


I have lost my pic of the completed repair, but at this point I sprayed some adhesive that was approved for rubber roofing onto the plywood and laid the roofing down on the plywood to dry. After it was dry, I sealed the cuts with 4" Eternabond tape and ran a bead of Dicor 502LSW sealant around all the edges of the tape.

We kept the 5er for several years after the repair and never had any problems with the repair leaking!
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Old 12-30-2017, 05:35 PM   #9
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If you catch it soon enough..all you need is the eternabond. Sometimes that is easier said than done.

I have a fiberglass roof so I keep denatured alcohol to clean. There is a rubber roof cleaner from eternabond I would use if mine was rubber.
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