Walls and Roof

Above grade wall assembly

Dense-pack cellulose blown into existing 2x4 stud wall cavities , 7/8” existing board sheathing wrapped with HardieWrap weather barrier. Second stud wall, 2x3, was constructed behind the existing to create another layer of blown packed celluslose. 2 layers of 2” foil faced polyiso board and a single layer of 1” layed onto the exterior – all seams staggered and sealed with Dow Weathermate Tape. A minimal amount of screws were used for the first two layers.

Above grade wall R-value 54.0
Flat attic assembly

20” layer of loose-fill cellulose

Windows and Doors

Average window U-factor 0.19
Solar Heat Gain Coefficient 0.61

Mechanical Systems

Space cooling - Manufacturer & Model Mitsubishi mini split
Space heating - Manufacturer & Model Mitsubishi mini split
Ventilation - Manufacturer & Model Zehnder HRV
Lighting Manufacturer and Model
Lighting Efficiency
Mechanical Equipment Installation Details and Comments

Three-head ductless minisplit from Mitsubishi provides heat from the downstairs until; the upper apartment is heated with an AO smith water heater piped to a Unico fan-coil system. Each unit is also equipped with its own 90-perfect-efficient Zehnder HRV. A grid connected 7kw photovoltaic array supplies the lower unit with electricity.