This two-story enclosure with a basement is designed for Boston, MA (Cold Climate). It features an unvented roof with open-cell spray foam insulation and vapor retarder paint or coating, or alternatively, closed-cell spray foam insulation in rafter cavities, and asphalt shingles. The 2x6 advanced wood frame walls are insulated with cavity insulation and rigid insulation on the exterior. The rim joist is insulated with cavity insulation on the interior. Rigid insulation with joints taped or sealed is installed on the interior of the foundation wall. XPS/EPS/high density mineral wool insulation is installed under the foundation slab.