Siding remodel in Climate Zone 2A (Houston)
My research has lead me to (inside-outside):
Drywall -> Roxul (rockwool) -> QuietBrace (sheathing) -> perforated radiant barrier -> 1×4 cedar furring -> Hardie lap siding
I picked QuietBrace (fiberboard) due to its permeability factor. I am worried about foam (polyisocyanurate) in such a humid environment such as Houston. Another option is just straight up plywood. I’m not worried about structural integrity of the material since my house doesn’t currently have wall sheathing on it.
Also a question regarding the furring strips. I settled on cedar the other day after racking my brain about this. I didn’t want untreated pine since it would be outside the housewrap (radiant barrier), and I didn’t want PT (pressure treated) due to off-gassing. I was thinking along the lines of fence pickets (5/8″ x 3 1/2″), but am concerned over the air gap for the radiant barrier. I can’t find a concise air space necessity for radiant barrier.