31 May '12, 4pm

Green Building Q&A: Furring Strips over rigid foam

I'd like to add 1" rigid foam (XPS) over my rafters on a cape cod (above knee wall) cathedral ceiling w/o the hassle of furring strips as some of FH Bldng articles show. I'll finish that w/1/2 inch drywall. I have R 21 fiberglass paper faced batts in that cathedral ceiling and plastic baffles for air flow from eaves to ridge, exhausting out side gables as the back side of that top floor has been dormer-ed. Are the furring strips necessary?

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

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