Sealing and Insulating a Vented Attic
I live in Zone 4A (Home was built in 2005) and I’m in the planning stages of converting my vented attic to conditioned/air sealed. Cost is going to be a concern, as achieving R-60 with just closed-cell foam would be very expensive.
What’s the most economical (and safe) way to achieve R-60 with my setup? I have rafters with 2/4s on towards the roof deck (gable ends are much much smaller, about 1.5 inches in depth).
I read some comments in other threads about putting 4 inches of CCF and then topping it off with the rest of OCF (open cell foam) or even another material.
But my stud depth towards the roof deck is not as deep as I expected.
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