Originally Posted by joecaption
I'm confused how would there be room for foam baffles for ventalation, (about 1-1/2") and R19 insulation which is about 6" thick fit in a 5" space?
The house is over 100 years old, the rafters are true 2x4's. Adding 31/2" to the existing 4" rafter will give me enough room for 51/2" high density roll R20 and give me 2" for ventilation.
The linked article talked about using furring strips. I'm looking to use 2x4's i'm having a hard time imagining I'm supposed to drive a nail through that and into the rafter? We may also go to 2x6's so that we can get to R30. How much differance would we notice by upping to that R value?