PHnw Building Directory

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 ft2TFA145.1 m2TFA


Annual heat demand:3.91 kBtu/yr•ft2TFA12.3 kWh/yr•m2TFA
Heat load:3.26 Btu/hr•ft2TFA10.3 W/m2TFA
Primary energy demand:33 kBtu/yr•ft2TFA104.1 kWh/yr•m2TFA
Airtightness:0.4 ACH50


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


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.


Passive House Consultant:Markus Barrera-Kolb
Passive House Consultant Certification:PHI
Architect:Whitney Architecture
Structural Engineer:Bykonen Carter Quinn
Contractor:Karl Jolles


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