I am in the process of building a new home in zone 5. We are doing a passive solar house with vaulted ceiling in the living room, kitchen and dining room area and the rest of the house will be flat ceilings. I plan to do blown in cellulose insulation on the flat ceilings and closed cell on the vaulted ceiling. I plan to do 3” of rigid foam insulation on the exterior walls with spary in cellulose (2×6) walls. I am also using Prosoco seam filler for the sheathing and Fast Flash for the flashing. 1.) Since I have the air and vapor barrier to the exterior, should I not seal the drywall to the wall? 2.) I don’t have rigid foam on the roof, so should I airseal the interior drywall there (on the ceiling) on the flat ceiling?