PHnw Building Directory

Courtland Place Passive House

Building Use: Detached single-family residence with accessory dwelling unit

Project Type: New passive house building

New in-fill residence designed and started in 2010. Main unit is 3+ bedroom, 3 bath. Accessory unit is an attached 1 bedroom/1 bath above garage.

Location:Seattle, Washington 98118
Dwelling Units:2
PH Calculation Protocol(s):PHI
PH Modeling Software(s):PHPP, WUFI Passive
Year Of Construction:2011

Project Size

Floor Area:1,900.0 ft2TFA176.5 m2TFA


Annual heat demand:4.40 kBtu/yr•ft2TFA13.9 kWh/yr•m2TFA
Heat load:3.10 Btu/hr•ft2TFA9.8 W/m2TFA
Primary energy demand:36 kBtu/yr•ft2TFA113.6 kWh/yr•m2TFA
Airtightness:0.41 ACH50


Construction Type:wood
Floor Assembly:Area 1: Slab on grade - 4" concrete above 10 mil poly above 12" EPS (perimeter is 16" concrete above 4" high-density EPS)
Area 2: Suspended floor above garage - wood flooring above tar paper above 3/4" plywood above 16" I-joist with BIBS above 5/8" GWB
Wall Assembly:14" Wall truss: Fiber-cement or cedar siding over 3/4" ventilated gap over membrane over Homasote 440 over 14" truss with BIBS over 7/16" OSB over GWB
Roof Assembly:Main Area: Vented Shed - Metal roofing over membrane over 1/2" plywood over 22" truss (2" air gap with membrane above 20" BIBS) over 7/16" OSB over 5/8" GWB
Windows:Cascadia - Tile/Turn and fixed, fiberglass insulated frame
Entry Doors:Therma-tru insulated fiberglass panels, wood frames, cusom wood thresholds


Ventilation system:Ultimate Air Recoupaerator
Heating/Cooling system:Main heating: hydronic coil heated from Domestic Hot Water tank integrated in ventilation
Secondary heating: Electric resistance
Domestic hot water system:AO Smith natural gas, condensing, sealed combustion with outside air supply
Renewables:none yet


Passive House Consultant:Dan Whitmore
Architect:Dan Whitmore
Structural Engineer:Carissa Farkas
Mechanical Engineer:-
Contractor:Black Bird Builders


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