Echo Lake Residence
Walls and Roof
The general approach was to employ "super insulated" walls, attic and sub-slab insulation levels, combined with aggressive attention to air sealing during construction.
| Subslab assembly |
The slab on grade main floor is a 4" concrete slab poured over 8" of XPS insulation (R-40) |
|---|---|
| Subslab R-value | 40.0 |
| Slab edge assembly |
The slab edge is supported by a 6" core ICF stem wall (R-23) |
| Slab edge R-value | 23.0 |
| Foundation wall assembly |
The foundation is a 6" core ICF stem wall atop a continuous concrete strip footing. |
| Foundation wall R-value | 23.0 |
| Above grade wall assembly |
All exterior above grade walls are 11-7/8" double stud walls with 2x4 inner and 2x6 outer studs aligned @ 16" on center. The cavities were filled with dense packed cellulose. |
| Above grade wall R-value | 43.0 |
| Flat attic assembly |
The attic is insulated with 18" of blown cellulose insulation. |
| Flat attic R-value | 60.0 |
Windows and Doors
Window Assembly:
The windows are Inline fiberglass, tilt-turn and fixed units with insulated fiberglass frames.The IGU's are tri-pane assemblies with warm edge spacers and various coatings depending on glass orientation.
Door Assembly:
Exterior doors are insulated fiberglass units. The patio door is a tilt-turn unit to match the window unit's performance and glazing specification. The entry door is an insulated fiberglass unit with dual pane 1/4 lite glass.
| Average window U-factor | 0.21 |
|---|---|
| Solar Heat Gain Coefficient | 0.25 |
| Visible Light Transmittance | 0.39 |
| Door U-Factor | 0.21 |
| Door Area | 40 sq ft |
Mechanical Systems
| Space cooling - Manufacturer & Model | Geothermal heat pump, GeoThermal - 034 |
|---|---|
| Space heating - Manufacturer & Model | Geothermal heat pump, GeoThermal - 034, 36,200 BTUH, COP 3.0, EER 14.6, three 180 foot deep closed loop wells |
| Domestic hot water - Manufacturer & Model | Heat pump de-superheater |
| Domestic hot water - capacity | 105 gal |
| Ventilation - Manufacturer & Model | Balanced ERV, RenewAire EV130, 130 CFM, set to run 20 min/hr with HSO switches in bathrooms. |
| Lighting Manufacturer and Model | |
| Lighting Efficiency | |
| Mechanical Equipment Installation Details and Comments |
All mechanicals are within the conditioned space. Energy star lighting. |
Envelope
| Air Changes per hour, ACH50 | 0.47 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |