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Old 04-12-2015, 10:07 AM   #1
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Unhappy Hard pimples under wallpaper

We noticed these hard pimples underneath a window. Did some research and many said it was from water infiltrating and causing the glue to crystallize. We pulled the window and didn't see much evidence of water damage. Just a tiny bit of wetness on the outer wallboard. Checked out the window and saw some of the weatherstripping on the bottom was flat. We are thinking perhaps this was where water may have gotten in? The styrofoam is thick and completely dry as well as the interior wallboard. Really puzzled on how water is to blame. We went around the whole window with butyl tape to be sure. Any advice on how to fix the interior wall without replacing the whole wallboard panel? We are putting it up for sale and want it to be ready to go. Also, there are no pimples above the window or anywhere else in the coach which makes me think it could have been the window.
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Old 04-12-2015, 12:45 PM   #2
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Do you have a problem with condensation forming on the windows at all? I have single pane windows, and when it's cold outside and when condensation forms on the windows inside, it also forms on the interior window frames. That looks like a good candidate for what's causing the bumps (if in fact it is crystalized glue from moisture)
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Old 04-12-2015, 12:57 PM   #3
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Yes. When we run the heat the windows do steam up.
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Old 04-12-2015, 01:14 PM   #4
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Then take a look at the interior aluminum window framing in the mornings and see if they are wet. There have been times in my TT that condensation from the frames was actually dripping down the wall a little bit.

I've wondered if condensation also forms around the outer channel of the window frame (where the frame contacts the wall cutout). If so, that would explain moisture getting behind the wall paper (or is it plastic) covering.
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Old 04-12-2015, 07:23 PM   #5
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It is also possible the window seal is leaking even though you may not see much evidence thereof. These seals have been known to fail in the past, needing resealing. There are several threads on the forum dealing with this, here is one of them.

https://www.jaycoowners.com/forums/f3...ows-12016.html
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Old 04-12-2015, 08:33 PM   #6
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I have the same problem; however, oddly enough, it isn't near/below a window. It is actually to the right of the window between the window itself and the range hood. Not sure how water could have gotten there, but it looks exactly like your picture shown. Maybe steam from cooking?
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Old 04-12-2015, 09:34 PM   #7
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That don't look like water damage to me.
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