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Old 05-31-2010, 12:54 PM   #1
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Air Movement in Wall Cavity


The insulation and sheathing on this exterior bathroom wall shows signs of what look like air movement. The insulation was very dirty in area's as well as the sheathing. The sheathing doesn't seem wet and I'm not sure if the dark area's are signs of mold or just dirt from air moving past. There were small pieces of fiberglass insulation wedged in between the sheathing and the studs to fill in the gaps that are there.
The wall construction is aluminum siding, house wrap, sheathing, fiberglass batt, 2 mil poly and then drywall with tile. The house was built in 1980 in the pacific northwest region.
How can I prevent this from happening again and what should I do about the current condition of the sheathing? I will be using 6mil poly with cement board when it's time to redo.
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Old 05-31-2010, 02:08 PM   #2
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Air Movement in Wall Cavity


You have air movement through a discontinuous vapour barrier or you have a hole in it. 2 mil is pretty scrawny as a vb, so replace it with something like 6 mil and then tape the seams.

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Old 05-31-2010, 03:51 PM   #3
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Air Movement in Wall Cavity


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Originally Posted by ccarlisle View Post
You have air movement through a discontinuous vapour barrier or you have a hole in it. 2 mil is pretty scrawny as a vb, so replace it with something like 6 mil and then tape the seams.
Thanks, so should I use caulk between the sheathing and the stud where the air is passing through as well? If the air is passing from the cavity shown to the one next to it (which would be in the next room) how far should I go to try to eliminate this movement.

Last edited by RalphPeters; 05-31-2010 at 04:00 PM.
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