Zero Energy Certified

BALLARD EMERALD STAR ZERO ENERGY HOME

VITAL STATS
Certification StatusZero Energy Certified
Version of LBC3.1
LocationSeattle, WA, USA
TypologyBuilding
Project Area2,218 SF
Start of OccupancyAugust 2015
Occupancy TypeSingle Family Residence
Number of Occupants3
PROJECT TEAM
OwnerDwell Development
Owner RepresentativeAnthony Maschmedt
ArchitectCaron Architecture
Energy EngineerEvergreen Certified
Key SubcontractorsPuget Sound Solar, Washington State University, Built Green
Photo Courtesy of Dwell Development
BUILDING SYSTEMS INFORMATION
Wall R value and section specificationR-46. Double 2×4 stud wall, 12” cavity dense-packed R-46 cellulose, ½” OSB sheathing, fluid applied WRB
Roof R value and section specificationR-84
Floor R value and section specificationR-24
WindowsTriple pane, low-e, argon filled, wood framed. U values = 0.16, SHGC = 0.49
Air infiltration rate and sealing protocol1.13 (ACH-50). Fluid applied water/air barrier, interior air seal, minimal penetrations on exterior walls.
NON-MECHANICAL SYSTEMS

420-gallon rainwater cistern is installed.

MECHANICAL VENTILATION

HRV, Merv 7 filters, Zehnder CA 350.

HOT WATER

83-gallon CO2 water heater for radiant floor heat and hot water.

LIGHTING

Optimize southern and western exposure, double height spaces with maximum natural light.

Photo Courtesy of Dwell Development
RENEWABLE PRODUCTION SYSTEMS INFORMATION

8.0 kW PV, 29 Itek Energy 275W panels, 14.5 APS 500W microinverters.

PERFORMANCE
Actual energy use during performance period7711 kWh
Actual energy produced during performance period8872 kWh
Net Energy Use-1161 kWh
EUI11.9 kBTU/sf/yr
Photo Courtesy of Dwell Development
DESIGN PROCESS

The project team designed and built the Emerald Star home to continue to push the sustainability envelope. Find out more about the process here.

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