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.
"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.
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
350 CFM50 (heating and cooling) as measured by blower door test
Envelope
Air Changes per hour, ACH50
350.00 ACH50
Air Changes per hour, CFM50
0.50
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 |