27 Feb '12, 2am

Open cell SPF in an attic with no vapor barrier #green

I live in Pittsburgh and am doing a renovation of an old home. I'm doing a lot of the work so far myself, with the help of my father. At the same time I've been working with an architect to figure out the overall project. And there is disagreement between my two spheres on how to insulate the attic. The (hopefully) key points: it's currently a vented attic, I'm going to be putting HVAC and ductwork in that space. My father is recommending I keep the attic as vented, put down batting on the attic floor, and do various things to ensure the HVAC unit is leak free and insulated The architects recommend spraying open cell foam between the rafters and make the attic an unvented insulated space. The biggest concern about the open cell SPF (other than it's a lot more expensive) I have at the moment is the fact that's it's not a vapor barrier. But, the architects seem to think this...

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

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