PHnw Building Directory

Phoenix Passive House

Building Use: Detached single-family residence

Project Type: Passive house retrofit and addition

Converting a 1942 bungalow into a 2400sf Passive House while using foam-free techniques & local materials.

Location:Portland, Oregon 97239
Dwelling Units:1
PH Calculation Protocol(s):PHIUS+
PH Modeling Software(s):WUFI Passive
PH Certification(s):PHIUS
Construction Cost:$ 500,000 USD
Year Of Construction:2016

Project Size

Floor Area:1,590.0 ft2iCFA147.7 m2iCFA


Annual heat demand:4.70 kBtu/yr•ft2iCFA14.8 kWh/yr•m2iCFA
Heat load:2.70 Btu/hr•ft2iCFA8.5 W/m2iCFA
Annual cooling demand:0.80 kBtu/yr•ft2iCFA2.5 kWh/yr•m2iCFA
Cooling load:1.70 Btu/hr•ft2iCFA5.4 W/m2iCFA
Primary energy demand:33.90 kBtu/yr•ft2iCFA106.9 kWh/yr•m2iCFA
Airtightness:0.6 ft3/min•ft2


Construction Type:wood
Floor Assembly:Outside to inside: Open vinyl mesh, 6" mineral wool, 7.5" cellulose inside existing 2x8 floor joists, 3/4" taped plywood or Henry's Blueskin on top of existing rabbeted fir subfloor for air tightness.
Wall Assembly:Outside to inside: cedar siding, 1x4 fir rainscreeen, 1/5" Agepan sheathing, 9.5" vertical wood I-Joists willed with cellulose, 1/2 plywood sheathing taped for air barrier, 2x4 fir studs filled with cellulose, 5/8" drywall.
Roof Assembly:Outside to inside: metal standing seam roofing, WRB, 1/2" plywood, 2x4 on short side purlins, 5/8" Agepan sheathing, 9.5" I joists filled with cellulose, 1/2" plywood taped for air barrier, 2x12 roof joists filed with cellulose, 5/8" drywall.
Windows:HH Windows. Tilt & turn and Casement. South and west side are aluminum clad, all are FSC certified fir windows.
Entry Doors:HH Windows entry doors.FSC certified fir.


Ventilation system:Zehnder 350
Heating/Cooling system:mini-split, Mitsubishi
Domestic hot water system:AO Smith Heat pump hot water heater
Renewables:Solar ready


Passive House Consultant:Scott Kosmecki
Passive House Consultant Certification:PHIUS
Architect:Scott Kosmecki
Structural Engineer:Angle Design
Contractor:Hinge Build Group, LLC



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