Solar Energy House
Walls and Roof
Subslab assembly
6” total thickness rigid XPS (3 layers of 2” thick boards), entire area, R-30
Subslab R-value
30.0
Slab edge assembly
overall R30, but complex detail:
4” total thickness rigid XPS (3 layers of 2” thick boards), R-20.
6” thick section of concrete foundation wall above grade
2” thick rigid XPS exterior insulation with protective coating (Tuff II Coating, Styro Industries), R-10
Slab edge R-value
30.0
Foundation wall assembly
2” thick rigid XPS exterior insulation (R-10) below and above grade, entire depth of foundation wall to the top of foundation footing (4 ft). No basement.
Foundation wall R-value
10.0
Above grade wall assembly
Double stud wall, 12” wall cavity, dense pack cellulose (GreenFiber Cocoon2), R-43
Cedar board siding (1”) with vented rain-screen (3/8”).
Above grade wall R-value
43.0
Flat attic assembly
24” depth loose fill cellulose (GreenFiber Cocoon2), R-80. Cold attic (vented)
Flat attic R-value
80.0
Cathedral ceiling assembly
24” depth loose fill cellulose (GreenFiber Cocoon2), R-80. Cold attic (vented)
Cathedral ceiling R-value
80.0
Windows and Doors
Window Assembly:
Because window configuration is optimized for passive solar space heating, they have different solar heat gain coefficient (SHGC) and U-values, based on their orientation: high SHGC on the South side, low SHGC on all other sides. Of the total 155.6 sf glazing area, 66% is on the South side, 9% on the North side, and 25% on the East and West sides.
All windows are Inline Fiberglass, Series 325, triple-pane argon filled. Listed SHGC and U-values are full frame.
Average window U-factor
0.19
Solar Heat Gain Coefficient
0.41
Mechanical Systems
Space cooling - Manufacturer & Model
Mitsubishi
Space heating - Manufacturer & Model
Mitsubishi
Domestic hot water - Manufacturer & Model
Solar domestic hot water as described in the “Renewable Energy” section.
Ventilation - Manufacturer & Model
Fresh air ventilation system
Lighting Manufacturer and Model
Lighting Efficiency
Walls and Roof
| Subslab assembly |
6” total thickness rigid XPS (3 layers of 2” thick boards), entire area, R-30 |
|---|---|
| Subslab R-value | 30.0 |
| Slab edge assembly |
overall R30, but complex detail: |
| Slab edge R-value | 30.0 |
| Foundation wall assembly |
2” thick rigid XPS exterior insulation (R-10) below and above grade, entire depth of foundation wall to the top of foundation footing (4 ft). No basement. |
| Foundation wall R-value | 10.0 |
| Above grade wall assembly |
Double stud wall, 12” wall cavity, dense pack cellulose (GreenFiber Cocoon2), R-43 |
| Above grade wall R-value | 43.0 |
| Flat attic assembly |
24” depth loose fill cellulose (GreenFiber Cocoon2), R-80. Cold attic (vented) |
| Flat attic R-value | 80.0 |
| Cathedral ceiling assembly |
24” depth loose fill cellulose (GreenFiber Cocoon2), R-80. Cold attic (vented) |
| Cathedral ceiling R-value | 80.0 |
Windows and Doors
Window Assembly:
Because window configuration is optimized for passive solar space heating, they have different solar heat gain coefficient (SHGC) and U-values, based on their orientation: high SHGC on the South side, low SHGC on all other sides. Of the total 155.6 sf glazing area, 66% is on the South side, 9% on the North side, and 25% on the East and West sides.
All windows are Inline Fiberglass, Series 325, triple-pane argon filled. Listed SHGC and U-values are full frame.
| Average window U-factor | 0.19 |
|---|---|
| Solar Heat Gain Coefficient | 0.41 |
Mechanical Systems
| Space cooling - Manufacturer & Model | Mitsubishi |
|---|---|
| Space heating - Manufacturer & Model | Mitsubishi |
| Domestic hot water - Manufacturer & Model | Solar domestic hot water as described in the “Renewable Energy” section. |
| Ventilation - Manufacturer & Model | Fresh air ventilation system |
| Lighting Manufacturer and Model | |
| Lighting Efficiency |