David,
Just when I thought I had it figured out . . . as it concerns this discussion about A barriers such as Tyvek,
your statement : "does not block moisture"!
is misleading.
here copied straight out of DuPont website and I quote:
"Whether it's a skyscraper or a single-family home, the building envelope is an essential line of defense against air, water and wasted energy.
DuPont Building Envelope Systems offer solutions that meet or exceed codes, help extend building life, and help reduce fossil fuel consumption. They resist moisture and air, but are highly permeable, to reduce the risk of condensation damage, wood rot or mold growth."
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