Victorian net zero renovation
Walls and Roof
PERSIST concept (Canadian): insulate exterior of house. Strip down to sheathing; apply ice and water, then 7.25" EPS foam in 4x8' blocks. Then apply 5/8" plywood for strength. Then Tyvek. Then furring strips. Then lap siding. See pictures
| Subslab assembly |
Basement floor removed; new slab poured on top of 2" foam. |
|---|---|
| Subslab R-value | 10.0 |
| Slab edge assembly |
"Cocoon" system: pressure jet and vacuum used to excavate 4" around foundation, down to footing. Then 1" EPS foam inserted, and the gap between foundation wall and foam sheet was filled with more foam squirted in. |
| Slab edge R-value | 0.0 |
| Foundation wall assembly |
Existing foundation variously reinforced concrete or stone. Little R value. |
| Foundation wall R-value | 36.8 |
| Above grade wall assembly |
joists extended to provide support for new exterior wall. See PERSIST description above |
| Above grade wall R-value | 40.3 |
| Cathedral ceiling assembly |
Attic space has no insulation in floor. All insulation above inner (old) roof. |
| Roof Assembly |
Old roof retained; new roof built over. Ridge beam (18" x 6") inserted under peak, supported by steel posts running down interior of interior walls to reinforced concrete pads in basement. New roof consists of 14" high OSB I-beams, 21" on center, gaps filled with about 10" of squirted foam (LaPolla). Then 2x6"s laid vertically crosswise, and plywood attached to them. Large air space kept, vented at eaves. Roofing is 30-year shingles. Total R-value is 80, including batt insulation tucked into 2x6"s under old roof. |
| Roof R-value | 79.0 |
Windows and Doors
Window Assembly:
Anderson Windows& Doors. A- series, all triple-glazed.
Door Assembly:
Andersen Windows & Doors.
| Average window U-factor | 0.22 |
|---|---|
| Solar Heat Gain Coefficient | 0.36 |
| Door Area | 21 sq ft |
Mechanical Systems
| Space cooling - Manufacturer & Model | ditto |
|---|---|
| Space heating - Manufacturer & Model | Enertech Geocomfort GYT036A11MT1CSS heat pump |
| Domestic hot water - Manufacturer & Model | AO Smith HPTU 50 N 120 |
| Domestic hot water - capacity | 60 gal |
| Ventilation - Manufacturer & Model | Broan ERV250 ECM |
| Lighting Manufacturer and Model | all LED |
| Lighting Efficiency | |
| Mechanical Equipment Installation Details and Comments |
heat pump for HVAC - COP 5 |
Envelope
| Air Changes per hour, ACH50 | 350.00 ACH50 |
|---|---|
| Air Changes per hour, CFM50 | 0.50 |