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Originally Posted by nightfighter
From the Dupont website;
One of the most popular and widely known applications of TyvekŪ is in the construction industry, where it is used to increase air and water resistance, helping to lower heating and cooling costs in buildings and providing better protection against water and moisture intrusion. The unique qualities of TyvekŪ help stop air flow through wall cavities; help hold out bulk water and wind-driven rain; and allow moisture vapor to escape from inside walls. The result is a more comfortable, energy-efficient building with far fewer chances for damage from degradation effects.
I don't think sweating is a problem I've had to deal with. The Tyvek will let moisture out. Attic vents and soffit vents are what let the house breathe. I like it for what it's worth....
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It works fine...alone, but not with insulation over it.
The insulation doesn't let it work properly and allow moisture vapor to escape from inside walls, so there's where one of the problems can occur.