Butler Residence
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.
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. |