Blisters in interior wall

[wmtire]

I have one of my camping buddies who just showed me a problem developing in his fifth wheel recently. He is getting blisters in the wallpaper near the floor, and also higher.

I believe this is some kind of water intrusion, especially being below a window.

Has anyone seen or experienced similar?

Thanks in advance for any assistance or advice.

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[Iwannacamp]

Looks like that nail??? is rusty. Kinda scary to me. Hopefully they just left the window open.


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[lesptr]

I posted a similar experience a while back. I found some likely points that water could have been coming in and sealed them. Then we used a clothing steamer to steam the blisters and rolled them back down which improved the look but didn't completely make them disappear. While I had the TT at the dealer, I had them look at it and was told it looked to them that it was a reaction of high humidity and the glue used on the wallpaper and that they don't believe there was a leak. The manager also said that they get brand new units that arrive with sections of wall paper with the blisters. The tech said the only fix is to remove and replace the panel. Someone posted in the thread I started that their dealer sanded the blisters off and re-papered directly over it.

I'm not sure I agree or disagree my dealers info, but I was never able to find the leak.

Here's the thread I started.
http://www.forestriverforums.com/for...er-107144.html



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[garmford]

He has water coming in somewhere. The pimples are a tell tale sign. I find it humorous that the dealer somehow doesn't know what causes those pimples. He should check the caulking around the window, exterior siding, and even at the roof to wall transition. Catch it before it gets worse!!


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[lesptr]

I checked all that, and never found the cause. It never got any worse. I did put a dehumidifier in after we discovered it. So go figure. I'm unconvinced either way!


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[Witch Doctor]

If you think it water put a pin hole in the bubble and see if water comes out, if not it could just be gassing from the glue. Never seen that before but that is just contact paper that they use over 1/8" board. But that's a pure guess but maybe a place to start.

[lesptr]

I poked several blisters and nothing came out but air.


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[lgray]

Exact same issue on Trilogy, pimples in wall board were from a faulty window seal. The removed the window, re-sealed and replaced wall board.

[lgray]

[ATTACH][/ATTACH]

[Witch Doctor]

What did the window seal have to do with it?

[Witch Doctor]

That is just plain ugly

[conceptumator]

Definitely water intrusion, most likely inside the wall itself. Check the caulking at the roof perimeter and the windows. This WILL get worse! We didn't know what it was when we bought our first RV and the dealer said it was nothing to worry about. Wrong!

[hillsdaletc]

I have seen this many many times. It is moisture entering the wall and the "popcorn bubbles" are the chemical reaction of the panel glue.
Don't waste time in locating the intrusion area. Since it is under the window don't hesitate to pull the window. This way you can easily see the water path tracking on the frame if it's coming in and rolling down the sides. Look closely at the sealer when you sake it down for any dirt tracks. Is your awning located near the area at the floor line. The older style awning hardware acts like a gutter and runs the water directly where the two lag screws are attached to the trailer at the floor line. If you can grab the awning arm and move the lower bracket ITS LEAKING.

[lgray]

Originally Posted by Witch Doctor

What did the window seal have to do with it?

Not sure, fortunately, this was when it was still under warranty and that is what they got approved through the factory to fix. No awning on that side, or other hardware, fiberglass roof, so the window makes sense. No issues since the repairs were made 2 years ago.

[wmtire]

I personally kinda felt the blisters and it felt like something solid (like wood) was poking out. This is why I initially believed it was some kind of water intrusion making the paneling or whatever is is actually behind the wallpaper, blister.

[Wa11y757]

My 195bh did the same thing. Dealer said it was a leak at the front top running light. Had to replace the panels. Weird thing was it was only 1/4 of the way up the wall. Not at the top like one would think. Nor did I have a wet floor or water dripping under the tt. Good luck.


Now I'm going back to looking for my 10mm wrench! 2016 Wildwood 27RKSS
2005 F250 PSD

[crunchman12001]

Originally Posted by Witch Doctor

What did the window seal have to do with it?

A faulty window seal would allow water to get inside the wall causing the wall blisters.

[asquared]

Originally Posted by wmtire

I personally kinda felt the blisters and it felt like something solid (like wood) was poking out. This is why I initially believed it was some kind of water intrusion making the paneling or whatever is is actually behind the wallpaper, blister.

It is water intrusion. The popcorn blisters are something behind the paper swelling. First time I saw it I thought it was nails backing out. Bad slide seals were the cause on the one I saw.