EcoVillage Ithaca: TREE
Walls and Roof
| Subslab assembly |
Rigid insulation installed under slab on grade |
|---|---|
| Subslab R-value | 36.0 |
| Slab edge assembly |
Rigid insulation installed at slab on grade edge |
| Slab edge R-value | 19.5 |
| Above grade wall assembly |
The Double 2x4 stud wall with 5” gap has a 12” depth. Insulation includes R-22 (3.5” at R-6.3/in) closed cell spray foam and R-30 cellulose (8.5” at R-3.5/in) were installed in this double stud wall. Walls are sheathed by ZIPS with taped seams. The exterior finish is a rain screen with cementitious siding. |
| Above grade wall R-value | 52.0 |
| Flat attic assembly |
25" of cellulose (R-3.6/in) is sprayed in the attic. |
| Flat attic R-value | 90.0 |
Windows and Doors
Window Assembly:
Triple-pane, Low-e windows
| Average window U-factor | 0.17 |
|---|---|
| Solar Heat Gain Coefficient | 0.62 |
Mechanical Systems
| Space cooling - Manufacturer & Model | none installed |
|---|---|
| Space heating - Manufacturer & Model | Electric baseboard |
| Domestic hot water - Manufacturer & Model | Solar thermal (Thermo Ray) preheat with electric storage tank, 0.94 EF |
| Domestic hot water - capacity | 80 gal |
| Domestic hot water - efficiency | 94 kW |
| Ventilation - Manufacturer & Model | ERV, UltimateAir RecoupAerator |
| Lighting Manufacturer and Model | |
| Lighting Efficiency |
Envelope
| Air Changes per hour, ACH50 | 0.42 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |