Re: V aulted Ceiling Condensation what to do.
This is unfortunately very common and it relates to a poor job of insulation in a cold climate. You see, the wood used to frame the house is about 1/3 as effective as fiberglass in stopping the cold. So the cold will come through where the wood used for framing are, more than anywhere else. This is due to the framing used in walls (and for cathedral ceilings ) is coupled directly to the exterior and interior --- known as thermal bridging.
If the humidity is fairly high in the house, but not necessarily bad enough to get wet all over the windows, the cold parts of the wall in front of the studs will attract the moisture. This in turn will attract and trap more dust than the rest of the wall, and hence what we call *Ghosting*. It can look like the framing is coming right through the wall.
It usually doesn't indicate any issues with liquid moisture creating rotting or any other problems associated to moisture.
Thicker walls, or better yet, insulated sheathing over one side or the other of the wall will stop the problem. So if you are building new, or residing, make sure to add about 1-1/2 inches of foam insulation board over the whole wall or ceiling. That gives great insulation over the insulated part of the wall, and at least the minimum necessary to stop the ghosting over the framing areas.
If you are refinishing a room, or a cathedral ceiling, even as little as 1/2 inch of foam over the existing drywall and then new drywall will make a difference. One inch would be much better.
Last edited by canuk; 02-12-2011 at 04:52 PM.
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