Building Use: Detached single-family residence
Project Type: New passive house building
Park Passive is the 2014 recipient of the national AIA Housing Award and the 2016 recipient of the PHIUS Design Award. Located in Seattle’s Madison Park neighborhood, the building is home to an active family of four with an interest in sustainability and modern design. The constraints on the 2,710 SF home and its 2,000 SF urban lot were abundant, including a small, shallow floor plate; a zoning envelope that required working within the form of the existing house; limited solar access; and 17” thick walls. The design team addressed these challenges by emphasizing vertical space and playing with wall thickness on the front façade. This led to interesting surprises, such as the double-height vaulted kitchen space that visually connects the main living area to the upstairs kids play area; a day-lihgt open stair punctuated with views to the street and a carved out nook for a window bench; and several large skylights. The design also widened the floor plate and addressed the lack of a back yard by creating a strong tie to the front yard using a large lift-slide door and expansive glazing.
Location: | Seattle, Washington 98112 | |
Dwelling Units: | 1 | |
PH Calculation Protocol(s): | PHI | |
PH Modeling Software(s): | PHPP | |
PH Certification(s): | PHI | |
Year Of Construction: | 2014 | |
Project Size | ||
Floor Area: | 1,959.0 ft2TFA | 182 m2TFA |
Performance | ||
Heating Degree Days: | 4,742 °F•day/yr | 2,634.4 °C•day/yr |
Annual heat demand: | 4.76 kBtu/yr•ft2TFA | 15 kWh/yr•m2TFA |
Heat load: | 4.12 Btu/hr•ft2TFA | 13 W/m2TFA |
Primary energy demand: | 36.77 kBtu/yr•ft2TFA | 116 kWh/yr•m2TFA |
Airtightness: | 0.6 ACH50 | |
Envelope | ||
Construction Type: | wood | |
Floor Assembly: | The basement floor is slab on grade, with 4 inches of concrete, 16 inches of gravel, and 8 inches of EPS insulation (R4.6 per inch). R38.7 U-value = 0.147 W/(m2K) | |
Wall Assembly: | The exterior walls are a layered construction starting with a gypsum layer, 5.5 inches of denspack fiberglass (R4.2 per inch), plywood sheathing with taped seams to create the air barrier, 9.5 inches of dens pack fiberglass (R4.2 per inch), and fiberboard R49.2 U-value = 0.0203 W/(m2K) | |
Roof Assembly: | The primary roof assembly begins with a gypsum layer, then 3.5 inches of denspack fiberglass (R4.2 per inch), then a layer of taped OSB for air barrier, then 15.75 inches of dens pack fiberglass (R4.2 per inch), a sheathing layer, then 4 inches of Roxul mineral wool (R4.17 per inch). R-89.3 U-value = 0.09 W/(m2K) | |
Windows: | Frame Intus, Eforte, Prestige, and Lift+Slide product Eforte-uPVC Prestige-polymer Lift+Slide-uPVC U w-value = 0.89 W/(m2K) Glazing Intus Triple-Glazed 4Low E x16x4x16x4 Low E and Fakro Skylight Glazing U g-value = 0.6 W/(m2K) g -value = 62 % | |
Entry Doors: | PRESTIGE doors by Intus glazed doors U d-value = 1.07 W/(m2K) | |
Systems | ||
Ventilation system: | Zehnder, Comfoair 350 HRV Ventilation for supply and extract air with heat recovery. effective specific heat recovery efficiency: 91% | |
Heating/Cooling system: | direct electrical, ECO-heater NA400S, wall-mounted ceramic convection heater. Mitsubishi SEZ KD18NA4 ducted mini split for cooling upstairs. | |
Domestic hot water system: | Sanden CO2 heat pump water heater: GUS-A45HPA | |
Other green building systems: | Xeriscape. Use of salvaged trees onsite for interior finishes. No VOC paints. | |
Team | ||
Passive House Consultant: | Rob Harrison | |
Passive House Consultant Certification: | PHI | |
Architect: | NK Architects | |
Contractor: | Cascade Built | |
Comments | ||
Additional Information: | Passive House consulting: Rob Harrison Passive House construction advisor: Dan Whitmore | |
Project Website: | http://www.nkarch.com/projects/park-passive/ |