Cape Cod Passive House
Walls and Roof
Walls are double stud construction, 14 inch total insulated thickness
| Subslab assembly |
10 inches of EPS, 6 mil poly sheet, 4 inch concrete, 1.5 inch EPS between sleeper studs. Total of 11.5 inches EPS. R values are for entire assembly from PHPP Model. |
|---|---|
| Subslab R-value | 48.3 |
| Slab edge assembly |
perimeter thermally isolated from stem wall with 4 inch EPS |
| Slab edge R-value | 16.5 |
| Foundation wall assembly |
10 inch thick concrete stem wall |
| Foundation wall R-value | 0.3 |
| Above grade wall assembly |
2x6 16" o.c. outer wall, 4 inch space, 2x4 inner stud wall for a total insulated thickness of 14 inches. 4 inch closed cell foam on sheathing, and 10 inches dense pack dry cellulose. R values are for entire assembly from PHPP Model. |
| Above grade wall R-value | 52.2 |
| Flat attic assembly |
24 inches blown in cellulose between trusses. R values from PHPP Model. |
| Flat attic R-value | 91.7 |
| Cathedral ceiling assembly |
NA |
Windows and Doors
Window Assembly:
triple pane wood tilt turn windows with aluminum clad by Makrowin (Yaro). R values are for entire assembly from PHPP Model.
Door Assembly:
triple pane argon glass with wood frame aluminum clad, same construction as windows. R values are for entire assembly from PHPP Model.
| Average window U-factor | 0.15 |
|---|---|
| Solar Heat Gain Coefficient | 0.62 |
| Visible Light Transmittance | 0.73 |
| Door U-Factor | 0.15 |
| Door Area | 29 sq ft |
Mechanical Systems
| Space cooling - Manufacturer & Model | Daiken Quaternity heat pump 12000 btu FTXG12HVJU & RXG12HVJU |
|---|---|
| Space cooling - capacity | 4 kW |
| Space heating - Manufacturer & Model | Daiken Quaternity heat pump 12000 btu FTXG12HVJU & RXG12HVJU |
| Space heating - capacity | 5 kW |
| Domestic hot water - Manufacturer & Model | AO Smith heat pump PHPT-80 (EF=2.33) |
| Domestic hot water - capacity | 80 gal |
| Domestic hot water - efficiency | 2 kW |
| Ventilation - Manufacturer & Model | Zehnder Comfo Air 350 and Comfo Fond-L |
| Lighting Manufacturer and Model | LED various manufacturers |
| Lighting Efficiency | |
| Mechanical Equipment Installation Details and Comments |
Each ventilation port was measured and set by a certified Zehnder commissioning expert |
Envelope
| Air Changes per hour, ACH50 | 0.37 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |