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Old 10-28-2014, 10:04 PM   #1
Join Date: Sep 2014
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roof dilemma

Had some water leaks due to cracked lap sealant around skylight and vents. The membrane is fine. It got some insulation wet and about 6" of roof deck is soft. I got to get the wet insulation out and replace the first 6-12" of plywood. It is starting to get the ceiling wet from the wet insulation. Can the membrane be salvaged if i am able to pull it back and let it dry. I want to cut the plywood replace the insulation and let it dry out. Is it possible to do this?

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Old 10-28-2014, 10:32 PM   #2
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Probably is possible but will be awkward and the amount of effort will be quite high. IMO the result could be problematic. I have tried lifing the membrane to dry out some sheeting and apply Git Rot to stiffen the sheeting. Lots of time and effort. It was partially successful and I later replaced the roof.

I could have replaced half but found the easiest was to lift and replace all of the affected area. In the end I replaced it all.

IMO the the easiest way to fix the problem is to cut the membrane back so you can work on the sheeting.

Work the sheeting back far enough to get all of the questionable material. You will find it will go back farther than you think. Likely be mold of some sort in there as well.

Then purchase some replacement EPDM or TPO and glue it down on the new sheeting. Use some kind of sealant tape to join the edges of the replacement roofing.

Here is a link to a supplier. RV Leak Repair Tapes & Sealants | EternaBond

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Old 10-28-2014, 10:46 PM   #3
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Depending on the construction of surround of skylight you maybe able to remove the interior finish surround and get heated air into the ceiling to dry out insulation and roof support plywood using a heater blower, may have to support with ladder in shower.
Use what Gordon mentioned or self leveling sealant.
If surround does not drop try opening a ceiling light if you have florescent lighting.
In my signature below are links in QT's 1 & 2 there is information links for roof repairs in the roofing section of link.
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Old 10-29-2014, 06:48 PM   #4
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I tend to suspect that Gordon is correct. You really won't know for sure what you have until you get into it. I don't understand about the wet insulation as most recent RVs have Styrofoam insulation that doesn't hold water.
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Old 10-30-2014, 04:47 AM   #5
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Its a 2006 with fiberglass. As you mention the foam will not hold water but it still will exist. Only correct way is total roof removal and inspect everything. Still confused as which way I wanna tackle this project. Replacing the roof will be a breeze as I am a contractor. That being said replacing this roof will be new to me. I don't have much time now for this. I do have it stored indoors. I would like not to disturb anything on the interior.
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Old 10-30-2014, 09:37 AM   #6
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Sorry I thought TPMS when you said membrane. I have no experience with fiberglass. That will be coming up as the coach is fiberglass.

If it is easy to remove the roof that is probably the easiest thing to do to get a satisfactory job. While I had the 5er roof off I was able to replace the existing lighting with dimmable LED. What a difference. Created more circuits and included a remote so the lighting is more functional beyond just providing light to see.

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