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TWINCAMSAM · 03-21-2021, 11:16 AM

Discovered this situation in the bathroom of our 2014 MAPD. These blisters on the exterior wall adjacent to the toilet. The blisters follow a vertical path about 6 inches wide. I pierced on blister and water came out. Not good. On the roof I could find any obvious points of entry. Still investigating. Need advice on dealing with the blisters inside. Cut and remove paper? I know I have to find the source. You think Newmar has the wallpaper?

TWINCAMSAM · 03-21-2021, 11:18 AM

Not sure why pic rotated.

TXiceman · 03-21-2021, 01:45 PM

There is probably a leak at the window above the problem area. I would remove the window and reseal it. You will need to remove the interior trim and then a whole mess of screws that clamp the window in the coach. You should reinstall it with Butyl tape and then caulk the edges.

The is not much you can do for the wall at this point short of piercing a bubble and getting the water out.

Ken

TWINCAMSAM · 03-21-2021, 04:37 PM

There is a cabinet above the window and the blisters are in the cabinet also. All blisters are to the left of the window a couple inches.

TWINCAMSAM · 03-21-2021, 04:44 PM

I’ll try to get the pics right.

DRM901 · 03-21-2021, 09:20 PM

Once you identify and fix the issue, I would try a syringe loaded with glue. Small hole in the center of a blister and inject glue. Roll it around with a dowel to be sure it covered the whole area. Clamp down. (I would use a smallish 1" board against the wall and a 1/2" spring board braced against the far wall to put some tension on it.)

You should be able to do a small section at a time (3"x5" or so).

Glue is probably wall paper glue.