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asktoh 03-25-2013 02:34 PM

Locating A Leak Behind Paint
 
We just finished our bedroom about three months ago. Now on the wall and around the ceiling I'm noticing the paint is bubbling and in some spots I see a few small cracks. This was an area where the roof originally leaked and this whole area had to be re-plastered. So, it has a history but to the best of our knowledge it was fixed.

The cause of this is either one of two things: 1) Because we didn't prime the mudded areas underneath the paint or 2) We still have a leak.

Which brings me to my question:

What's the best way to determine if this is being caused by water damage behind the plaster and paint? My thought was to put dry sponge in the addict above the wall to see if it gets wet during the next rain.

Any other thoughts?

joecaption 03-25-2013 02:39 PM

#1 go back and add your location to your profile.
Go to quick links to edit.
Leak caused from an ice dam is the first thing I would think of if it's an outside wall.
Ice on the roof?
How did the roof get "fixed"?

Ice dams are cause from lack of insulation in the attic and lack of air sealing.

wkearney99 03-25-2013 03:59 PM

Clearly it wasn't fixed. Or what was fixed wasn't the only problem.

If the paint's bubbled then there's very likely more going on behind the drywall. Be prepared to remove/replace/repaint.

Meanwhile a bit of christmas tissue paper or newspaper is a great way to determine if there are active leaks. You'd want something that was going to be damaged by getting wet. Not just a sponge as you won't really be able to tell what happened. That and paper can be spread over a larger area. So put some layers of that up in the attic above the area getting wet.

Also, is the leak actually up at the ceiling? And not from a spot on the outside wall? Could be driving rain or an overflowing rain gutter splashing against the wall and getting in that way.

cdaniels 03-25-2013 04:13 PM

There is still a moisture problem whether or not it's still leaking.Make sure all the insulation in the attic is dry, then figure out if it's still leaking or not.

ToolSeeker 03-25-2013 06:44 PM

Go into the attic and remove the insulation from the area then as stated put down some tissue paper or paper towels or spread out a roll of toilet paper these items will show a leak very easy so you won't have any doubt.

ToolSeeker 03-25-2013 06:46 PM

Go into the attic and remove the insulation from the area then as stated put down some tissue paper or paper towels or spread out a roll of toilet paper these items will show a leak very easy so you won't have any doubt. Is there any chance you painted too soon after the repair and before the ceiling had a chance to completely dry out?


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