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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:

http://www.wilwaylumber.com/howto/insulation/howto086.htm
http://www.yumasun.com/coolideas/homes.shtml
http://www.healthgoods.com/Education/Healthy_Home_Information/General_Energy_Efficiency/home_audits.htm
http://people.delphi.com/ericnoble/madoer/octnotes.htm
http://oikos.com/esb/41/comfortterm.html
http://www.doityourself.com/insulate/insulationmistakes.htm
http://www.learn2.com/browse/learnlet_detail.asp?learnlet_id=1071&ch_id=7
http://www.taunton.com/fh/features/materials/insulation/1.htm
http://northernontario.about.com/aboutcanada/northernontario/c/ht/00/10/How_Install_Fiberglass_Insualtion0971588769.htm

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