30 Jul '12, 3pm

Green Building Q&A: Do I need another air barrier?

I've extended my rafters with luan gussets and 2x4s behind a future knee wall in my raised heel, attic trussed house. Zone 6. I've also built 1 inch vent chutes out of 1inch tuff r polyiso. Now I can fit two 5.5 inch roxul batts in the rafters, under the poly ISO chutes. Question. Do I need an air barrier under the roxul? If so, does it also have to be a fire rated? If not fire barrier rated, what are my options? I'd like to avoid sheetrock and use wood up in this part of the house. The ceiling below is 1/2 blueboard and plaster.

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

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