27 Jul '12, 6pm

Flash and Batt Insulation Exterior Remodel #green

I have a 100+ year-old home in climate zone 6A (Wisconsin) that needs new sheathing and siding, so I figured I may as well reinsulate the wall cavity as I pull and replace the sheathing (currently has R13 batt in a 2x4 wall cavity). After considering a variety of options, I keep coming back to flash and batt and wonder if this will work for me. Most (all?) flash and batt applications are applied from the interior--that is, 1-2" of closed-cell spray foam is applied to the exterior sheathing, batt insulation is installed, and drywall is put up. I will need to do the opposite--2" of spray foam applied to the drywall side of the cavity, then batt insulation, then plywood sheathing, WRB, 1/4" vented drainage plane, then clapboard siding. The more I read about water vapor buildup, the more confused I get, but it seems to me that in my climate applying the 2" of spray foam to the...

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

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