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[pct-l] Tyvek

Remember that Tyvek has 2 sides to it.  You need to put the "right" side
down for waterproofness usually the side with the printing on it.  One side
is a water barrier and keeps water out the other side is breathable like
Goretex that lets vapor through.  That is so that when they put it on houses
it lets the houses breathe (prevents mildew and such) but keeps the rain

Fire Marshal

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