Insulation considerations for new construction
I'm in the planning stages of a new home in the northeast (RI) and am researching various insulation types (high performance fiberglass, cellulose & spray in foam).
I like what I've read so far about spray-in foam so the question is, would it be better to go with 2x4 or 2x6 construction under these scenarious?
A) 2x6 = R3.6 x 5.5, so about an R-20
B) 2x4 = R3.6 x 3.5, about R-13, plus add 1" rigid foam boards to exterior which adds another R-5 for R-18
I guess the benefit of 2x4 constructions with the rigid foam boards would be that I'm providing insulations to the otherwise naked studs.