29 Mar '13, 11pm

sealing rafter bay / ceiling of exterior wall #green

sealing rafter bay / ceiling of exterior wall #green

I am sealing a cathedral ceiling with rigid foam, the "cut and cobble" method. I think I read about sealing the ceiling of exterior walls because of pressure from below, but am unsure. The attached photo shows the space between a rafter bay. Currently, I am applying foam between the rafter bays, attached to the roof sheathing, sealing with caulk or Great Stuff. My question is, should rigid foam be applied to the bottom of the sill (I think that is the word for it) which is encircled in the attached photo? And if so, how much foam? Just enough - one 2 inch piece - to provide an air barrier, or several layers to provide more insulation? As a side note, this house has roof sheathing, and then fiberglass batts resting between the rafter bays, sitting on top of a plywood finish. The batts are filthy and falling apart. I understand the dirt demonstrates air has passed through th...

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