13 Aug '11, 2am

Green Building Q&A: How about sealing and insulating both the roof deck and the attic floor?

I just read Joe Lstiburek's excellent Crash Course in Roof Venting. It caused me to have an unorthodox idea about which I seek your opinion: sealing both the attic floor and the roof deck. Please read on before you dismiss me as nuts. My wife and I live in a 100 year old four-square in Joliet, IL (Zone 5). It has a hip roof with about eight feet of main ridge, eleven feet on each of three dormer ridges, and three feet of eave overhangs all around. I had dense-pack cellulose blown into the balloon-frame stud cavities, and I removed the old attic floor and the old and sparse mineral wool, sealed all openings and cracks that I could find, reinstalled the mineral wool and supplemented it with cellulose to the tops of the joists, and replaced the old flooring with ¾" plywood. The attic floor joists are 2x8s, so the insulation, although greatly improved, is still not adequate fo...

Full article: http://www.greenbuildingadvisor.com/community/forum/gba-p...

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