Purchased RV leak over cab, now what?

Alex is an acrylic/silicone mix, stays flexible, handles expansion well and is paintable. It is used in homes with vinyl windows and can be sanded/re-applied over itself. The ProFlex is a great product, but the outer bead of sealant on the windows is just an added protection. The butyl tape would be fine on its own. I have no worries using Alex as an extra protection.

Jose

I would recommend ProFlex RV around the window edges. It's made for the job. It's probably 3x the price of the Alex caulk, but one tube goes a long way on an RV. Silicone is considered a no-no on an RV.

Yes, usagi. Many solvent based contact cements will dissolve the foam. Fastbond 10 is water based and once set it won't re-hydrate.

Remove your windows, remove the old sealant with acetone and re-set the windows with fresh butyl tape. Then use Alex around the outside. That should give you nice, leak free windows.

Finish everything by using some Eternabond around your top seams. That sucker will be well sealed.

If you just want it to last a bit and the structure is sound, then use some kind of elastomeric brush/roll on product to seal the rest of the roof for a few years.

Jose

Thank you Jose for your post. I read through it. I do wonder about the contact cement doesn't it dissolve styrofoam? There are some water-based versions that seem to be similar here:
Adhesives
I was thinking of liquid nails foam formula which doesn't dissolve styrofoam.

I also am just ripping out everything in the cab-over area to find the leaks. I don't plan on keeping the R/V long term so all I want is that it be reasonably comfortable and not leak. So I think I'm more inclined toward the sort of repairs that its4mykids is talking about.


The structure consists of aluminum square stock the passenger side has the majority of the leaks. I think it may be leaking around the front window too. The cab-over area will be used purely as storage.

There are leaks further back so in order to make the sort of repair that Jose is doing I'd probably have to rip off the entire roof. I think its would be better to trash the R/V rather than do that.

My leak was the joint between coach and front piece used Ethernabond tape. no more leaks. Also caulked every joint I could find after cleaning with acetone.

I totally agree about the frame. If the structure is sound, replace all the skin material and put er' back together. As you can see in the write up, my framing was WAAAAAAAY gone. If the steel framing had been OK, I would have had SO much less to fix.

Jose

Its4mykids wrote:
Bottom line: as long as the framing is structurally sound, a lot can be done for little $$$. Take the inside apart, see what you have, stop the leak, enjoy. Don't be afraid to think "outside the box" when coming up with ideas for the repairs (such as screwing in the delam walls from the exterior side). And - Eternabond is your friend.

Yeah, you're right on the money for me. Thanks to you and Jose I'm not going down with this ship yet. It's structurally great and since it poured last night (I'm in Colorado) I've found 2 more leaks so 4 total. I'm really excited to hit HomeDepot tomorrow. Yipee!!

Gale Hawkins wrote:


Strong and dry is the main objective with this old stuff since it does not have much cash/resell value anyway.

My brother's exact line of thinking. I think he paid less than $5k for it seven years ago. Another $500 in water damage repairs and I think he had to work on the front end for another $500. He figured if he had to give it away when he was done with it, who cares. Heck, people lose that in depreciation on new units in one year. LOL

Its4mykids wrote:
My brother has a 1994 Tioga Class C that he bought knowing there was leaking/rot in the cabover. He got cheap, and it ran good. He wanted to camp in an RV, not drive around in luxury. He camped a couple times before he even touched the roof. Then we tore out the panelling and wet insulation in the bad areas to see what he had. Once we knew the framing was fine, we pulled back the rubber roof to a good area. Pretty much the entire cabover. We replaced the roofing deck with plywood, glued the rubber roof back down, and then sealed all joints/seams with Eternabond. That took a Saturday. Any exterior wall that were pulling away due to delam, etc. we simply screwed to the wall joist from the exterier with stainless screws and washers painted white from the manufacturer. Then he ran fans and a dehumidifer in the unit for a few days. At this point, he camped in it some more. Wasn't pretty inside above the cab, but it worked. Over the next two years, he slowly added paneling, customized the interior cabover the way he wanted, and moved on with life. He used it many times in between his repair days. He has less than $500 in his repairs. It is now dry, and structurally sound. He uses it all the time.

Maybe the big fancy motorhome next to him laughs at his repairs, but my bro' and his family are having just as much fun as the neighbors at a campground.

Bottom line: as long as the framing is structurally sound, a lot can be done for little $$$. Take the inside apart, see what you have, stop the leak, enjoy. Don't be afraid to think "outside the box" when coming up with ideas for the repairs (such as screwing in the delam walls from the exterior side). And - Eternabond is your friend.

Thanks. That is a ton of good pointers. Strong and dry is the main objective with this old stuff since it does not have much cash/resell value anyway.

I could see dealing with delamination where there are cabinets with painted washers/bolt heads and a large washer and nut hidden inside cabinets, etc where there were no studs one could find.

If the chassis is solid on an old MH that is the main thing.

My brother has a 1994 Tioga Class C that he bought knowing there was leaking/rot in the cabover. He got cheap, and it ran good. He wanted to camp in an RV, not drive around in luxury. He camped a couple times before he even touched the roof. Then we tore out the panelling and wet insulation in the bad areas to see what he had. Once we knew the framing was fine, we pulled back the rubber roof to a good area. Pretty much the entire cabover. We replaced the roofing deck with plywood, glued the rubber roof back down, and then sealed all joints/seams with Eternabond. That took a Saturday. Any exterior wall that were pulling away due to delam, etc. we simply screwed to the wall joist from the exterier with stainless screws and washers painted white from the manufacturer. Then he ran fans and a dehumidifer in the unit for a few days. At this point, he camped in it some more. Wasn't pretty inside above the cab, but it worked. Over the next two years, he slowly added paneling, customized the interior cabover the way he wanted, and moved on with life. He used it many times in between his repair days. He has less than $500 in his repairs. It is now dry, and structurally sound. He uses it all the time.

Maybe the big fancy motorhome next to him laughs at his repairs, but my bro' and his family are having just as much fun as the neighbors at a campground.

Bottom line: as long as the framing is structurally sound, a lot can be done for little $$$. Take the inside apart, see what you have, stop the leak, enjoy. Don't be afraid to think "outside the box" when coming up with ideas for the repairs (such as screwing in the delam walls from the exterior side). And - Eternabond is your friend.