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Old 02-06-2011, 03:46 PM   #16
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Definitely tear out the the fiberglass and trace the water source while it's wet...that's the best time to investigate water leaks, when the evidence is fresh. I would not recommend just adding additional layers of poly to cover up an issue behind the walls. That picture looks like a fair amount of water leaking...not just condesation. Tear out, investigate, repair the water leak source, and then go back to adding the vapor barrier.
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Old 02-06-2011, 06:19 PM   #17
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Originally Posted by fungku View Post
Actually tyvek is a moisture barrier and an air barrier if sealed properly.

It lets vapour through.

Like Gore-tex. The rain stays out but you stay dry because it "breathes" (i.e. vapour permeable).
Agree. Tyvek is a one-way moisture barrier. It allows water vapor to pass through it, but not the liquid itself. This allows the water vapor that is created inside the house (like steam from a shower or cooking) to escape, but it does not allow rain to get into the woodwork. Nor does it allow a great deal of air to escape from inside the house.

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