A combination of super-insulation and excellent air-tightness.
The walls of this house are 2×8 construction with dense-pack cellulose insulation (R-27), ZIP sheathing for the air barrier and 4” Roxul insulation (R-16) for a total insulation value of R-43. To maintain a continuous air barrier, the Stego Wrap is connected to the ZIP sheathing on the walls which doubles as the air barrier.
The roof is constructed of manufactured trusses with loose-fill cellulose insulation (R-90). The zip sheathing continues onto the ceiling plane of the roof trusses. The joint between the ZIP sheathing on the walls and ceiling were taped and sealed in order to create a continuous air barrier.
The windows, manufactured by Kneer-Sud, are high-performance, triple-paned, extremely air-tight, tilt and turn windows with thermally-broken frames. They are heavy and beautiful and easy to operate. The doors were also sourced from Kneer-Sud and are equal in quality to the windows.
The series of photos below lends more detail to the wall and roof construction. Stay tuned for our next blog post, which will cover the mechanical systems and blower door results.
Written by Christi Weber, Project Designer at TDS and Wisconsin’s first Certified Passive House Consultant. She has been in the design field for 10 years, specializing in residential projects, Passive House, Net-Zero and High Performance homes.