Tabor ADU
Building Use: Other
Project Type: New low-energy building with passive house components
ADU above existing garage. 660 square feet. One bedroom, one bath. Earth Advantage Net Zero-certified.
| Location: | Portland, Oregon 97215 | |
| PH Calculation Protocol(s): | PHIUS+ | |
| PH Modeling Software(s): | WUFI Passive | |
| Construction Cost: | $ 280,000 USD | |
| Year Of Construction: | 2017 | |
Project Size | ||
| Floor Area: | 665.4 ft2iCFA | 61.8 m2iCFA |
Performance | ||
| Heating Degree Days: | 4,963 °F•day/yr | 2,757.2 °C•day/yr |
| Annual heat demand: | 5.84 kBtu/yr•ft2iCFA | 18.4 kWh/yr•m2iCFA |
| Heat load: | 3.15 Btu/hr•ft2iCFA | 9.9 W/m2iCFA |
| Annual cooling demand: | 0.72 kBtu/yr•ft2iCFA | 2.3 kWh/yr•m2iCFA |
| Cooling load: | 1.65 Btu/hr•ft2iCFA | 5.2 W/m2iCFA |
| Primary energy demand: | 31.24 kBtu/yr•ft2iCFA | 98.5 kWh/yr•m2iCFA |
| Airtightness: | 0.04 ft3/min•ft2 | |
Envelope | ||
| Construction Type: | wood | |
| Floor Assembly: | 16" web trusses filled with dense-packed cellulose. | |
| Wall Assembly: | 2x6 filled with dense-packed cellulose. Plywood sheathing using Prosoco Joint & Seam Filler, Air Dam, and Fast Flash. 3" WRB, 4" GPS foam, and 3/4" inch rain screen assembly. Wood siding. | |
| Roof Assembly: | 30" loose-filled cellulose in raised heel trusses. Vented. | |
| Windows: | Glo triple-paned aluminum A7 series windows. | |
| Entry Doors: | Glo A7 series triple-paned aluminum door. | |
Systems | ||
| Ventilation system: | Lunos E2 series HRV. | |
| Heating/Cooling system: | 9,000 BTU Mitsubishi mini-split. | |
| Domestic hot water system: | Rheem heat pump tank. | |
| Renewables: | 7 kw photovoltaic system. | |
| Other green building systems: | Drain water heat recovery system. | |
Team | ||
| Passive House Consultant: | Ben Valentin | |
| Passive House Consultant Certification: | PHIUS | |
| Architect: | Ben Valentin | |
| Structural Engineer: | Grummel Engineering | |
| Mechanical Engineer: | Petra Heating & Cooling | |
| Contractor: | Birdsmouth Construction | |
Comments | ||
| Additional Information: | Final energy model to be completed in fall 2017. Pending certification. | |