PHnw Building Directory

Delphi Haus

Building Use: Detached single-family residence

Project Type: New passive house building

Northwest Contemporary 3 bedroom, 2 1/2 bath, private residence hidden in the hills of Western Washington. Designed and built for a young couple looking towards very specific future medical needs. Mobility, fall protection and an avoidance of direct natural light are critical programmatic needs. Brightly painted interior soffits allow solar gain while diffusing the direct sunlight into a golden glow. Constructed using Universal Design throughout, the house allows easy access and visual ties to the beautiful surroundings.

Location:Olympia, Washington 98506
Dwelling Units:1
PH Calculation Protocol(s):PHIUS+
PH Modeling Software(s):PHPP
PH Certification(s):PHIUS
Year Of Construction:2017

Project Size

Floor Area:2,288.0 ft2iCFA212.6 m2iCFA


Heating Degree Days:5,714 °F•day/yr3,174.4 °C•day/yr
Annual heat demand:5.62 kBtu/yr•ft2iCFA17.7 kWh/yr•m2iCFA
Heat load:2.76 Btu/hr•ft2iCFA8.7 W/m2iCFA
Annual cooling demand:11 kBtu/yr•ft2iCFA34.7 kWh/yr•m2iCFA
Cooling load:0.60 Btu/hr•ft2iCFA1.9 W/m2iCFA
Primary energy demand:36.45 kBtu/yr•ft2iCFA115 kWh/yr•m2iCFA
Airtightness:0.4 ft3/min•ft2


Construction Type:wood
Floor Assembly:Slab on grade - Cork or Marmoleum flooring. 4" heated concrete slab w/ 10" deep sand heat sink. 6 mil visqueen air barrier. 12" square bond beam foundation. Wrapped in 6" high density EPS insulation.
Wall Assembly:Wood framed - 1/2" GWB. 2x6 framed wall, dense packed with fiberglass insulation. 1/2" OSB coated with Henrys Blue Skin air and weather barrier. 6" EPS insulation. 3/4" rains screen. Hardi panel and shou-sugi-ban burnt cedar siding.
Roof Assembly:Standing seam metal roofing. 1/2" OSB sheathing. Manufactured trusses with 24" of blown cellulose insulation. 1/2" air sealed OSB. 1/2" GWB.
Windows:Zola Thermoplus Clad
Entry Doors:Zola Variotech and Codel SFF


Ventilation system:Zehnder Novus 300
Heating/Cooling system:Navien Combi on demand water heater w/ hydronic in-slab Radiant heat. Fujitsu ducted mini-split
Domestic hot water system:Navien Combi on demand water heater
Other green building systems:Solar ready design.


Passive House Consultant:Randy Foster - The Artisans Group
Passive House Consultant Certification:PHIUS
Architect:Tessa Smith - The Artisans Group
Structural Engineer:Carissa Farkas - CF Structural Engineering
Contractor:Randy Foster - The Artisans Group


Additional Information:Clerestory windows give solar gain without harsh direct sunlight. Worked amazingly well.

Self-supporting porch structures add steel detailing while minimizing thermal bridging.

Built -in HRV ducting chases in dropped ceilings allowed for easy and non-intrusive installation.
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