Sandywoods Farm Net Zero Spec House #1
Walls and Roof
R-60 SIP Roof, R-40 double stud open cell spray foam walls, R-20 closed cell spray foam under slab and covering entire surface of interior of concrete basement walls. R-40 open cell spray foam in rim joist. Triple glazed R-5 windows and doors.
| Subslab assembly |
R20 closed cell spray foam sprayed on top of 3/4 stone under concrete basement floor slab. |
|---|---|
| Subslab R-value | 20.0 |
| Slab edge assembly |
before the slab is poured the closed cell spray foam is sprayed on the stone and up the interior of the foundation walls. Therefore the slab is completely insulated from the outside. |
| Slab edge R-value | 20.0 |
| Foundation wall assembly |
closed cell foam sprayed to R20 on inside of foundation walls |
| Foundation wall R-value | 20.0 |
| Above grade wall assembly |
12" double stud walls filled with open cell spray foam insulation. |
| Above grade wall R-value | 40.0 |
| Flat attic assembly |
No flat attic. Cathedral SIP roof |
| Cathedral ceiling assembly |
16" thick EPS SIP Panel Roof |
| Cathedral ceiling R-value | 60.0 |
| Roof Assembly |
16" thick EPS SIP Panel Roof |
| Roof R-value | 60.0 |
Windows and Doors
Window Assembly:
vinyl new construction triple glazed, low-e, krypton gas filled double hung windows from Harvey Tribute Line
Door Assembly:
Sliding glass door is from same Harvey Tribute line with same spec's as windows. Entry doors are Therma-Tru Classic Craft models
| Average window U-factor | 0.20 |
|---|---|
| Solar Heat Gain Coefficient | 0.22 |
| Visible Light Transmittance | 0.32 |
| Door U-Factor | 0.20 |
| Door Area | 80 sq ft |
Mechanical Systems
| Space cooling - Manufacturer & Model | Fujitsu XLTH |
|---|---|
| Space cooling - capacity | 24 kW |
| Space heating - Manufacturer & Model | Fujitsu XLTH |
| Space heating - capacity | 32 kW |
| Domestic hot water - Manufacturer & Model | GE Geospring Heat Pump Hot water Heater |
| Domestic hot water - capacity | 60 gal |
| Domestic hot water - efficiency | 225 kW |
| Ventilation - Manufacturer & Model | Panasonic FV 05 11VKSL1 |
| Lighting Manufacturer and Model | LED screw in |
| Lighting Efficiency | LED |
| Mechanical Equipment Installation Details and Comments |
blower door testing will be done at end of construction. All ducting is within the conditioned space. |
Envelope
| Air Changes per hour, ACH50 | 1.00 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |