VITAL STATS
Certification Status | Zero Energy Certified |
Version of LBC | 3.1 |
Location | Seattle, WA, USA |
Typology | Building |
Project Area | 2,218 SF |
Start of Occupancy | August 2015 |
Occupancy Type | Single Family Residence |
Number of Occupants | 3 |
PROJECT TEAM
Owner | Dwell Development |
Owner Representative | Anthony Maschmedt |
Architect | Caron Architecture |
Energy Engineer | Evergreen Certified |
Key Subcontractors | Puget Sound Solar, Washington State University, Built Green |
![](https://living-future.org/wp-content/uploads/2022/09/18-0312_Ballard-Emerald-Star_Case-Study_1-1024x683.jpg)
BUILDING SYSTEMS INFORMATION
Wall R value and section specification | R-46. Double 2×4 stud wall, 12” cavity dense-packed R-46 cellulose, ½” OSB sheathing, fluid applied WRB |
Roof R value and section specification | R-84 |
Floor R value and section specification | R-24 |
Windows | Triple pane, low-e, argon filled, wood framed. U values = 0.16, SHGC = 0.49 |
Air infiltration rate and sealing protocol | 1.13 (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.
![](https://living-future.org/wp-content/uploads/2022/09/Case-Study_Ballard-Emerald-Star_6-1024x683.jpg)
RENEWABLE PRODUCTION SYSTEMS INFORMATION
8.0 kW PV, 29 Itek Energy 275W panels, 14.5 APS 500W microinverters.
PERFORMANCE
Actual energy use during performance period | 7711 kWh |
Actual energy produced during performance period | 8872 kWh |
Net Energy Use | -1161 kWh |
EUI | 11.9 kBTU/sf/yr |
![](https://living-future.org/wp-content/uploads/2022/09/Case-Study_Ballard-Emerald-Star_7-1024x683.jpg)
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.