wall cavity, need to fill?
I am building a new home in New Bern, North Carolina. It has a 1400 sq. foot "Superior Walls" basement insulated to R2.5. The vinyl will be "Cedar Max" with R-4 insulated backing. The inside walls will be closed cell 2" Poly and the roof deck will be closed cell 2.5" poly. R equivalent for these thicknesses is R-40 and R-53 respectively. Some walls are 2x4 and some are 2x6. The city inspection team says that I need to fully fill the wall cavity. That would mean using standard insulation over the poly which will already have cost almost 3 times the price of standard insulation. No one, including the inspection team, can tell me why. Does anyone have any experience with this. We are very close to decision time. Thanks, Wayne Delano