Meadowbrook Passive House Residence
Building Use: Detached single-family residence
Project Type: New passive house building
A new 3 bedroom single family residence with unheated basement garage & storage, partially heated basement, and two stories above.
| Location: | Seattle, Washington 98125 | |
| Dwelling Units: | 1 | |
| PH Calculation Protocol(s): | PHI | |
| PH Modeling Software(s): | PHPP | |
| Year Of Construction: | 2015 | |
Project Size | ||
| Floor Area: | 1,562.0 ft2TFA | 145.1 m2TFA |
Performance | ||
| Annual heat demand: | 3.91 kBtu/yr•ft2TFA | 12.3 kWh/yr•m2TFA |
| Heat load: | 3.26 Btu/hr•ft2TFA | 10.3 W/m2TFA |
| Primary energy demand: | 33 kBtu/yr•ft2TFA | 104.1 kWh/yr•m2TFA |
| Airtightness: | 0.4 ACH50 | |
Envelope | ||
| Construction Type: | wood | |
| Floor Assembly: | Basement (R: 56.1 h•ft2•°F/Btu): • 4" concrete topping slab • air & vapor barrier membrane • 12" EPS insulation • 4" structural concrete slab Floor over unheated garage (R: 45.3 h•ft2•°F/Btu): • hardwood flooring • plywood subfloor • 11 7/8" TJI joists with high-density blown-in fiberglass • 5/8" drywall | |
| Wall Assembly: | At foundation (R: 43.7 h•ft2•°F/Btu): • 5/8" drywall • 2x4 studs with high-density fiberglass insulation • 1/2" gap (with insulation) • 6" EPS insulation • concrete foundation wall (air barrier) To unheated garage (R64.1 h•ft2•°F/Btu): • 5/8" drywall • 2x double stud wall (12" cavity) with high-density blown-in fiberglass • 5/8" drywall Above grade (R: 52.4 h•ft2•°F/Btu): • 5/8" drywall • 2x4 studs with high-density blown-in fiberglass • 4 1/2" gap (with insulation) • 1/2" plywood sheathing (air barrier) • 2x6 studs with high-density blown-in fiberglass • 1/2" Densglass gypsum sheathing • rainscreen cladding system | |
| Roof Assembly: | Main roof (R: 96.6 h•ft2•°F/Btu): • 5/8" drywall • 3/4" furring for installation cavity • 1/2" OSB air barrier • wood trusses with 24" blown-in fiberglass insulation | |
| Windows: | Intus uPVC | |
| Entry Doors: | Intus uPVC | |
Systems | ||
| Ventilation system: | Zehnder ComfoAir 350 | |
| Heating/Cooling system: | electric resistance in HRV airstream, supplemental electric resistance in dwelling | |
| Domestic hot water system: | air-source heat pump water heater in unheated garage / storage | |
| Other green building systems: | Rainwater collection system for irrigation. | |
Team | ||
| Passive House Consultant: | Markus Barrera-Kolb | |
| Passive House Consultant Certification: | PHI | |
| Architect: | Whitney Architecture | |
| Structural Engineer: | Bykonen Carter Quinn | |
| Contractor: | Karl Jolles | |
Comments | ||