Quote:
Originally Posted by scottorious
so let me make sure i understand you. You said you would suggest taking foam and laying it over the rafters and putting drywall on top of that? and blowing in cellulose behind it?
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No. I was talking about in the crawl space. Doing what you said but in the crawl space. If you are going to have your sheet rock torn down (and if so I feel for you as it's messy. I'm doing that right now in my house) then I think strapping or something like that is a fine idea. I was only talking about the rafters in the crawl space. Seal the top plate with spray foam (1 part is fine) and run sheets of polyiso from the top plate to the top of the knee wall. Then dense pack. Tape all the seams with foil tape, if you are using foil faced boards. I would also air seal the roof deck from the underside with a vengeance first.
Thanks for the tip on the Fine Home Building article AC_Hacker. I imagine that there will be a BSC article about this soon.