Devens Greek Revival
Walls and Roof
The home starts with a double studded frame wall that is 12 inches thick for a R45.6 cavity insulation level. The attic has 18" of cellulose (R-63), the basement walls have 3 1/2 inches of closed cell foam (R-20), the basement slab and slab edge has 2" of rigid (R-10) and the window are triple pane (R-5). The super insulated shell allows for a simple Mitsubishi mini split of each of the two floors. The hot water heater is a 98% efficient Navien unit. The flat portion of the roof faces towards the South and has a 7.59 kW PV system installed on it.
| Subslab assembly |
2" rigid, R-10 |
|---|---|
| Subslab R-value | 10.0 |
| Slab edge assembly |
2" rigid, R-10 |
| Slab edge R-value | 10.0 |
| Foundation wall assembly |
3.5" closed cell foam, R-20 |
| Foundation wall R-value | 20.0 |
| Above grade wall assembly |
12" open cell foam, R-45.6 cavity |
| Above grade wall R-value | 45.6 |
| Flat attic assembly |
18" cellulose, R-67 |
| Flat attic R-value | 67.0 |
Windows and Doors
Window Assembly:
Windows U-value of 0.20, SHGC of 0.23
| Average window U-factor | 0.20 |
|---|---|
| Solar Heat Gain Coefficient | 0.23 |
Mechanical Systems
| Space cooling - Manufacturer & Model | Mitsubishi mini split, MSZ-FE12NA indoor unit, MUZ-FE12NA outdoor unit |
|---|---|
| Space heating - Manufacturer & Model | Mitsubishi mini split, MSZ-FE12NA indoor unit, MUZ-FE12NA outdoor unit |
| Domestic hot water - Manufacturer & Model | Navien 180 - 98% efficient |
| Ventilation - Manufacturer & Model | Panasonic Whisper Comfort ERV, model ERV FV-04VE1 in upstairs hallway plus Panasonic exhaust fans in bathrooms |
| Lighting Manufacturer and Model | Compact florescent |
| Lighting Efficiency |