23 Feb '12, 2pm

Green Building Q&A: Insulation help

John, You are located in Climate Zone 5 or Climate Zone 6. According to the 2009 IECC, the minimum R-value for wall insulation in these climate zones if R-20 (or R-13 between the studs IF you also include at least R-5 of exterior foam sheathing). So 2x6 walls don't give you any "extra room" -- they represent the minimum depth of wall framing unless you plan to install exterior rigid foam. There are many ways to insulate a ceiling, walls, and floor, and all of them can work -- as long as you include at least as much R-value as stipulated as the minimum value in the code, as long as the insulation is installed meticulously, and as long as you pay attention to air sealing. (In the case of fiberglass batts, that means that you need an air barrier on both sides of the insulation. For more information on fiberglass batts, see Installing Fiberglass Right .) Here is some informati...

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

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