03 Jul '11, 7am

Green Building Q&A: Using polyisocyanurate insulation on the exterior of a home

I just read one of the discussions’ on the use of polyisocyanurate insulation on the exterior of a home and how it acts as a vapor barrier and not to use it because it doesn't breath, thus resulting in potential condensation and mold problems within the walls. My concern is that I am currently getting ready to reside my house and I have already installed this on 50% of my home. I wanted to only add 1.5" thick foam to work with my 8" windows jams that I have upgraded to So I wanted the most R value possible from a foam. And polyiso gave this and It was also cheaper then the 2" XPS. I live in Northern Alberta Canada, Zone 5 I believe. My home wall consists of 1/2 drywall, poly vapor barrier, 2X6 walls with Roxul R22, 7/16" OSB sheeting then the 1.5" polyiso with tuck taped seems and then a layer of Typar over top. I have not sealed the bottom or top with caulking or tape bet...

Full article: http://www.greenbuildingadvisor.com/community/forum/gener...

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