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Old 09-04-2016, 02:53 PM   #1
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Blisters in interior wall

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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Old 09-04-2016, 03:15 PM   #2
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Looks like that nail??? is rusty. Kinda scary to me. Hopefully they just left the window open.


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Old 09-04-2016, 04:49 PM   #3
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Blisters in interior wall

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.
Blistered wallpaper?



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Old 09-05-2016, 10:14 AM   #4
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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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Old 09-05-2016, 10:46 AM   #5
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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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Old 09-05-2016, 10:53 AM   #6
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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.
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Old 09-05-2016, 11:11 AM   #7
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I poked several blisters and nothing came out but air.


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Old 09-05-2016, 11:35 AM   #8
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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.
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Old 09-05-2016, 11:49 AM   #9
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Old 09-05-2016, 12:20 PM   #10
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What did the window seal have to do with it?
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