Pioneer Valley Habitat for Humanity Net Zero Bungalow
adding energy affordability to the paradigm
Walls and Roof
Double-stud, dense-packed cellulose, with some loose-fill in roof, and some rigid foam under slab. Air sealing primarily at sheathing, with backup at drywall.
Subslab assembly
4" XPS (donated by Dow)
Subslab R-value
22.0
Slab edge assembly
2" XPS between slab and stem wall
Slab edge R-value
11.0
Foundation wall assembly
slab on grade
Above grade wall assembly
double-stud dense packed cellulose, 11.5" frame to frame
Above grade wall R-value
37.5
Flat attic assembly
24" loose fill on flat ceiling
Flat attic R-value
81.6
Cathedral ceiling assembly
none
Roof Assembly
all insulation in depth of trusses
Windows and Doors
Window Assembly:
Paradigm casements low-e with argon, tuned with high-solar-gain glass on south windows
Door Assembly:
Therma-Tru Smooth Star S601LE
Average window U-factor
0.32
Solar Heat Gain Coefficient
0.28
Visible Light Transmittance
0.53
Door U-Factor
0.19
Door Area
20 sq ft
Mechanical Systems
Space cooling - Manufacturer & Model
same as above
Space heating - Manufacturer & Model
Fujitsu AOU18RXFZH, ASU9RLF1 and ASU7RLF1
Space heating - capacity
5 kW
Domestic hot water - Manufacturer & Model
Geospring GEH80DFEJSR
Domestic hot water - capacity
80 gal
Domestic hot water - efficiency
3 kW
Ventilation - Manufacturer & Model
Lunos e2 (2 pairs)
Lighting Manufacturer and Model
Lighting Efficiency
Envelope
Air Changes per hour, ACH50
1.30 ACH50
Air Changes per hour, CFM50
adding energy affordability to the paradigm
Walls and Roof
Double-stud, dense-packed cellulose, with some loose-fill in roof, and some rigid foam under slab. Air sealing primarily at sheathing, with backup at drywall.
| Subslab assembly |
4" XPS (donated by Dow) |
|---|---|
| Subslab R-value | 22.0 |
| Slab edge assembly |
2" XPS between slab and stem wall |
| Slab edge R-value | 11.0 |
| Foundation wall assembly |
slab on grade |
| Above grade wall assembly |
double-stud dense packed cellulose, 11.5" frame to frame |
| Above grade wall R-value | 37.5 |
| Flat attic assembly |
24" loose fill on flat ceiling |
| Flat attic R-value | 81.6 |
| Cathedral ceiling assembly |
none |
| Roof Assembly |
all insulation in depth of trusses |
Windows and Doors
Window Assembly:
Paradigm casements low-e with argon, tuned with high-solar-gain glass on south windows
Door Assembly:
Therma-Tru Smooth Star S601LE
| Average window U-factor | 0.32 |
|---|---|
| Solar Heat Gain Coefficient | 0.28 |
| Visible Light Transmittance | 0.53 |
| Door U-Factor | 0.19 |
| Door Area | 20 sq ft |
Mechanical Systems
| Space cooling - Manufacturer & Model | same as above |
|---|---|
| Space heating - Manufacturer & Model | Fujitsu AOU18RXFZH, ASU9RLF1 and ASU7RLF1 |
| Space heating - capacity | 5 kW |
| Domestic hot water - Manufacturer & Model | Geospring GEH80DFEJSR |
| Domestic hot water - capacity | 80 gal |
| Domestic hot water - efficiency | 3 kW |
| Ventilation - Manufacturer & Model | Lunos e2 (2 pairs) |
| Lighting Manufacturer and Model | |
| Lighting Efficiency |
Envelope
| Air Changes per hour, ACH50 | 1.30 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |