Rubber Roof Repair - substructure problem

[chasfm11]

I just discovered that I have about a 2' by 2' section of the roof behind our shower bubble where the rubber membrane is still intact (cannot find a hole anywhere) but the structure underneath has been compromised. The roof area beside this strong and firm when I pound on it with my fist. This area is "mushy". I'm assuming that at least the top layer of plywood is damaged beyond repair.

We had a leak about a year ago. I thought that I found a problem around the shower bubble caulk, stripped all of it off carefully and recaulked it. Either I didn't fix that problem completely or there is still a leak that isn't coming through.

Questions:
1. Has anyone repaired substructure problems on any RV in our vintage? Do you by chance have photos?
2, I looks like I could cut the membrane in a good part, and simply peal it back to get at the parts that I need to replace. Is this possible? Assuming that I did, would I have to replace the membrane with Eternabond over the section and, if so, is it necessary to pre-coat the plywood first?
3. Lets assume that the damage is deeper than just the top plywood. Does that make this something besides a DIY?

The good news is that this RV is now parked inside and there is plenty of room above it to work. I'm not hampered by weather on this repair but I don't want to drag it out too long either.

Any thoughts, suggestions and input are welcome.

Thanks

Charlie

[JManatee]

We did our own roof, I have pictures that may help you Our Georgie Boy was rotted around the shower skylight as well, You can see this in the photos.

JManatee & Family RVing Site

[JoeandMarcia]

I have had 3 rubber roofs put on our Coachmen Santara in the past two years. (insurance paid for all three) On the Santara (37' Class A) it had a metal frame with 1/4 plywood over that, and then the rubber. If you are doing it your self you will need to cut out the bad wood to the support beams (or rafters) and then replace what you took out. Make sue to Tape the seams of the wood, I was told a fabric type tape should be used, and not duct tape.
I do have some pictures I took while it was in the shop.

[chasfm11]

Marvelous! Thank you so much for the link to your pictures. I'm assuming that my roof construction is very similar to yours. The difference is that I cannot overlay the plywood as you did without creating humps.

I'll have some additional questions but I hope that this gets me started.

Thanks again,

Charlie

[Hooligan]

Charles, I think you can replace the damaged wood and glue the rubber roof back in place and seal where you cut with the eternabond. I've sent an email on how the roof is constructed. I would not expect the foam to be damaged....

[tedlou]

Quote:

Originally Posted by Hooligan Charles, I think you can replace the damaged wood and glue the rubber roof back in place and seal where you cut with the eternabond. I've sent an email on how the roof is constructed. I would not expect the foam to be damaged....

May I have the roof info too? I have some soft areas on my roof....

[chasfm11]

What Hooligan sent was a breakout of the picture at the bottom of this thread.

RV.Net Open Roads Forum: Class A Motorhomes: Rubber roof repair - damaged substructure

It shows just the roof components rather than all of the component breakdowns of the Georgie Boy construction.