I am looking to build my house in Birmingham, AL, Zone 3. I plan on using Zip-R 1 1/2" (possible 1" due to cost) and use 2x6 advance framing minus the single top plate. The exterior will have brick veneer.
My question is about using spray foam in conjunction with the Zip R polyiso. Is it chemically compatible? Thought on just filling up 24" cavities with open cell vs 2" CC and R15 batts?
I am a little worried about the CC not allowing drying to the inside, however, I'm not sure, since it will be bonding with the polyiso.
The windows will be U.27 SHGC 0.17. Unfortunately, the house will face due South. There are a lot of windows, on the front, but plan good overhangs to help out. Some of the windows will fit directly in the stud bays as they will be 22" wide.
Any other suggestions?