Building Use: Detached single-family residence
Project Type: New passive house building
3 bedroom, 2 bath, single level house with attached 4 car garage
Location: | Carnation, Washington 98014 | |
Dwelling Units: | 1 | |
PH Calculation Protocol(s): | PHI | |
PH Modeling Software(s): | PHPP | |
PH Certification(s): | PHIUS | |
Year Of Construction: | 2016 | |
Project Size | ||
Floor Area: | 1,340.0 ft2TFA | 124.5 m2TFA |
Performance | ||
Annual heat demand: | 4.64 kBtu/yr•ft2TFA | 14.6 kWh/yr•m2TFA |
Heat load: | 3.60 Btu/hr•ft2TFA | 11.4 W/m2TFA |
Primary energy demand: | 37.10 kBtu/yr•ft2TFA | 117 kWh/yr•m2TFA |
Airtightness: | 0.47 ACH50 | |
Envelope | ||
Construction Type: | wood | |
Floor Assembly: | 3/4" plywood sheathing over 16" TJI's at 16" o.c. with dense-packed cellulose (R-55) and 2" (R-12) foil-faced polyiso rigid insulation (taped for air barrier) on underside of joists | |
Wall Assembly: | Metal siding over Tyvek building wrap over 1/2" CDX plywood sheathing (taped for air barrier) over two rows of 2x4 studs at 24" o.c. with 5" gap between with 12" (R-41) dense-packed cellulose and 5/8" gypsum wall board (no polyethylene vapor retarder) | |
Roof Assembly: | Metal roofing over underlayment over 5/8" plywood sheathing over 2x wood scissor trusses at 24" o.c. with 2" (R-12) foil faced polyiso rigid insulation (taped for air barrier) and 18" (R-62) dense-packed cellulose with 5/8" gypsum board ceiling | |
Windows: | Cascadia series 325 and 400 fiberglass, triple glazed, Cardinal low E 180/180, U-glazing = 0.13 (imperial), U-frames = 0.19 (imperial), SHGC-glazing = 0.58 (imperial) | |
Entry Doors: | Fiberglass faced with polyurethane foam core, U-value = 0.21 (imperial) | |
Systems | ||
Ventilation system: | Zehnder 350 HRV with Zehnder Comfo-tube distribution | |
Heating/Cooling system: | 2000w electric resistance duct heater connected to HRV | |
Domestic hot water system: | Solar hot water (40 evacuated tubes total) with a Rheem 80 gallon electric element backup. | |
Renewables: | Grid tied 8.5kW STC photovoltaic system with SMA Sunny Boy inverter. Net-Zero-Energy for 2016 and 2017 (18600 kWh generated > 18570 kWh used). | |
Other green building systems: | 8,800 gallon cistern collecting 100% rainwater for indoor potable use (first off grid rainwater harvesting in King County). Low-toxic and recycled content materials, FSC lumber, minimal use of PVC. Of the 8,250 pounds of waste this project generated, 89 | |
Team | ||
Passive House Consultant: | George Ostrow (not a CPHC) | |
Passive House Consultant Certification: | PHIUS | |
Architect: | George Ostrow of VELOCIPEDE architects, inc. | |
Structural Engineer: | HSV Engineers, Inc | |
Mechanical Engineer: | Rainwater system: Chris Webb & Associates, Inc. | |
Contractor: | Homeowner | |
Comments | ||
Additional Information: | This project was built by the homeowners over the course of about 5 years. | |
Project Website: | http://www.velocipede.net/projects/aamodt-passive-house |