24 Nov '12, 5am

Gaps in exterior foam - how to insulate underside of roof? #green

We're finally getting ready to insulate our roof, & after many hours of research have been unable to come to a consensus on what type of insulation to use. We are in climate zone 3 (central AL). This is an unvented cathedral ceiling, 12/12 pitch, & once finished will have sheetrock installed on the underside of the rafters (no can lights, etc). Currently the roof consists of: 2"x10" rafters on 24" centers, 1/2" OSB, 30lb roofing felt, with Ice & Water Shield on the ridge & in valleys, 1.5" foil-faced polyiso, metal roofing (3' wide sheets with ribs running vertically on 9" centers), screwed down through the polyiso into the OSB. When the roofing was installed, we were unaware of the potential condensation problems that could form on the underside of the roof deck. According to http://www.greenbuildingadvisor.com/blogs/dept/musings/how-build-insulat... , it looks like we wo...

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

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How to insulate roof? #green

How to insulate roof? #green

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