Melpet Farm Residences, Affordable Net Zero Ready
Walls and Roof
Our approach was to balance the building envelope performance with PV production, program and cost. Understanding the PV capacity of the roof surfaces facing south, the occupants and the budget constraints provided the parameters for our design.
Subslab assembly
2 layers of 1.5 inch type IX EPS Insulation
Subslab R-value
14.0
Slab edge assembly
.5 inch cement based filler over 2.5 inch type IX EPS Insulation
Slab edge R-value
12.0
Foundation wall assembly
2 layers of 1.5 inch type IX EPS Insulation
Foundation wall R-value
14.0
Above grade wall assembly
Starting below the sill plate: continuous 1.5 inch sealant impregnated foam tape and 3.5 foam sill sealer, 2 x 6 wood stud walls insulated with dense packed cellulose, .5 inch zip wall taped covered by 1.5 inch foil face polyisocyanurate with taped joints, vertical 1 x 4 furring at 16" oc, and fiber cement siding.
Above grade wall R-value
30.0
Flat attic assembly
Loose fill cellulose insulation
Flat attic R-value
50.0
Roof Assembly
Asphalt shingles over 5/8" zip sheathing with taped joints.
Windows and Doors
Window Assembly:
Paradigm 8381 Vinyl Triple Pane
Average window U-factor
0.24
Solar Heat Gain Coefficient
0.23
Visible Light Transmittance
0.38
Mechanical Systems
Space cooling - Manufacturer & Model
AOUA72RLBV
Space cooling - capacity
22 kW
Space heating - Manufacturer & Model
Fujitsu VRF AOUA72RLBV
Space heating - capacity
25 kW
Domestic hot water - Manufacturer & Model
State Hybrid Heat Pump Hot Water Heater
Domestic hot water - capacity
50 gal
Domestic hot water - efficiency
3 kW
Ventilation - Manufacturer & Model
475 Lunos E2, Panasonic Whisper Green
Lighting Manufacturer and Model
Lighting Efficiency
Mechanical Equipment Installation Details and Comments
Daily review by Owners Construction Representative, selected because he has knowledge of energy efficiency construction. Site visits made by Clear Result to perform quality control and blower door testing to evaluate airtightness.
Envelope
Air Changes per hour, ACH50
1.06 ACH50
Air Changes per hour, CFM50
Walls and Roof
Our approach was to balance the building envelope performance with PV production, program and cost. Understanding the PV capacity of the roof surfaces facing south, the occupants and the budget constraints provided the parameters for our design.
| Subslab assembly |
2 layers of 1.5 inch type IX EPS Insulation |
|---|---|
| Subslab R-value | 14.0 |
| Slab edge assembly |
.5 inch cement based filler over 2.5 inch type IX EPS Insulation |
| Slab edge R-value | 12.0 |
| Foundation wall assembly |
2 layers of 1.5 inch type IX EPS Insulation |
| Foundation wall R-value | 14.0 |
| Above grade wall assembly |
Starting below the sill plate: continuous 1.5 inch sealant impregnated foam tape and 3.5 foam sill sealer, 2 x 6 wood stud walls insulated with dense packed cellulose, .5 inch zip wall taped covered by 1.5 inch foil face polyisocyanurate with taped joints, vertical 1 x 4 furring at 16" oc, and fiber cement siding. |
| Above grade wall R-value | 30.0 |
| Flat attic assembly |
Loose fill cellulose insulation |
| Flat attic R-value | 50.0 |
| Roof Assembly |
Asphalt shingles over 5/8" zip sheathing with taped joints. |
Windows and Doors
Window Assembly:
Paradigm 8381 Vinyl Triple Pane
| Average window U-factor | 0.24 |
|---|---|
| Solar Heat Gain Coefficient | 0.23 |
| Visible Light Transmittance | 0.38 |
Mechanical Systems
| Space cooling - Manufacturer & Model | AOUA72RLBV |
|---|---|
| Space cooling - capacity | 22 kW |
| Space heating - Manufacturer & Model | Fujitsu VRF AOUA72RLBV |
| Space heating - capacity | 25 kW |
| Domestic hot water - Manufacturer & Model | State Hybrid Heat Pump Hot Water Heater |
| Domestic hot water - capacity | 50 gal |
| Domestic hot water - efficiency | 3 kW |
| Ventilation - Manufacturer & Model | 475 Lunos E2, Panasonic Whisper Green |
| Lighting Manufacturer and Model | |
| Lighting Efficiency | |
| Mechanical Equipment Installation Details and Comments |
Daily review by Owners Construction Representative, selected because he has knowledge of energy efficiency construction. Site visits made by Clear Result to perform quality control and blower door testing to evaluate airtightness. |
Envelope
| Air Changes per hour, ACH50 | 1.06 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |