We strive to build homes with tight envelopes that breathe through controlled mechanical methods.
To achieve this we highly recommend the following:
Incorporate open cell spray foam and/or wrapping the exterior with close cell.
Framer exterior wall with 2×6 studs or with a double wall with widths up to the customers preference.
Use plate seal between subfloor and studs and seal all penetrations (windows, doors, electrical, plumbing and HVAC).
Insulate roof rafters to create a semi-conditioned attic space which keeps the HVAC ducts at a moderate temperature thus maintaining the manufactures efficiency rating of the equipment. This also creates a more usable storage area.