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kraft paper vs poly

Posted by Harold Kestenholz - Hydronic Network on March 5th, 2001 02:38 PM
In reply to Poly on Ceiling by The Insulator on March 4th, 2001 08:23 PM [Go to top of thread]

This is interesting information. All sites discuss the kraft paper as a vapor barrier, yet no atention is given to the fact that kraft paper - whether foil, impregnated paper, plasticised paper, or poly layered kraft paper has seams at every joist that are not bonded to produce a complete vapor barrier. It is worth a precaution from an experienced insulator.

Even government instructions do not discuss this point:

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