PHnw Building Directory

Carlsson Project

Building Use: Detached single-family residence

Project Type: New low-energy building with passive house components

4 bedroom, 2.5 bath residence at 3,100 square ft. Earth Advantage net zero ready certified in 2015.

Location:Portland, Oregon 97219
Dwelling Units:1
PH Calculation Protocol(s):PHI
PH Modeling Software(s):PHPP
Construction Cost:$ 680,000 USD
Year Of Construction:2015

Project Size

Floor Area:2,367.0 ft2TFA219.9 m2TFA


Heating Degree Days:4,963 °F•day/yr2,757.2 °C•day/yr
Annual heat demand:14.74 kBtu/yr•ft2TFA46.5 kWh/yr•m2TFA
Heat load:5.49 Btu/hr•ft2TFA17.3 W/m2TFA
Annual cooling demand:0.76 kBtu/yr•ft2TFA2.4 kWh/yr•m2TFA
Cooling load:3.41 Btu/hr•ft2TFA10.8 W/m2TFA
Primary energy demand:59.20 kBtu/yr•ft2TFA186.8 kWh/yr•m2TFA
Airtightness:0.5 ACH50


Construction Type:wood
Floor Assembly:Basement slab with 6" EPS foam. Basement walls with 4" EPS foam.
Wall Assembly:2x6 stud with zip system sheathing. Seams sealed with Prosoco joint & seam, air dam, and fast flash. Two inches of ThermaCork exterior insulation. 3/4" rain screen assembly with wood siding.
Roof Assembly:2x12 rafter filled with dense-packed cellulose. Zip system air barrier over-framed with 2x6 rafters filled with Roxul ComfoBatts.
Windows:Zola Thermo Clad.
Entry Doors:Zola doors.


Ventilation system:Zehnder ComfoAir 550.
Heating/Cooling system:Ducted Mitsubishi mini-split heat pump.
Domestic hot water system:Electric tank.
Renewables:PV ready


Passive House Consultant:Ben Valentin
Passive House Consultant Certification:PHIUS
Architect:R&B Design Studio, Ray Culi
Structural Engineer:BK Structural Engineers, Bruce Kenney
Mechanical Engineer:Petra Heating & Cooling
Contractor:Birdsmouth Construction


Additional Information:Client's didn't want to pay for certification costs and due to large amount of West-facing glazing (directed at the view), it fell outside of certification.

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