Energy Efficient SIP Ballard House Seattle WA

Location: Seattle, WA

Project Information

Project Type: Residential, < 3,000 sq. ft.
Manufacturer: Premier Building Systems
Builder: TC Legend Homes
Design Professional: Net Zero in Seattle
Year Built: 2012


High Performance: Yes
HERS/EUI Index Score: -1
ACH50 - Blower Test Results: 0.56
CO2 lbs./sq.ft./year:

Awards/Certifications: DOE Zero Energy Ready Home, ENERGY STAR Certified, EPA Indoor AirPLUS, Nat'l Green Building Standard

Owner decided to go with one of TC Legend Homes designs for an open-floor plan, three-bedroom, two-story home, 1,915 square feet in size. It was constructed of structural insulated panels (SIPs), which are manufactured by Premier SIPs out of EPS foam and OSB plywood.

• Path: performance
• Walls: 6.5-inch SIPs with 5-5/8-inch EPS foam for R-26; corrugated house wrap; fiber cement siding
• Attic: 10-1/4-inch SIPs (9-3/8-inch EPS foam core) for R-41
• Foundation: slab on grade with 4 inches (R-20) XPS rigid insulation under slab and 2 inches (R-10) XPS at perimeter of foundation walls
• Windows: triple-pane, argon-filled, vinyl-framed, with low-e coating on 3 sides; U=0.15 to 0.20 SHGC=0.50
• Air Sealing: 0.56 ACH 50
• Ventilation: timer-controlled fans balanced to bring in and exhaust air, HEPA MERV 19 filters 
• HVAC: air-to-water heat pump (3-ton,35,400 Btu/h capacity, efficiency of COP 3.0-5.5, 9.2 HSPF) provides hot water for 1st floor radiant heat
• Hot Water: air-to-water heat pump preheats water for electric storage tank heater
• Lighting: 100% LED and CFL, 4 ENERGY STAR ceiling fans, solar tubes
• Appliances: ENERGY STAR dishwasher, clothes washer, refrigerator (all lowest energy use in their categories)
• Solar: 6.44 kW installed
• Water Conservation: low-flow plumbing fixtures; 100% xeriscaped with native drought-tolerant plants, drip irrigation from rain barrels for vegetable garden only
• Other: thermal mass concrete floors, passive solar design. No-VOC paints and finishes. Reclaimed flooring, tubs, and sink. Locally sourced SIPs
• Electric Car Charging Station: not installed but roughed in

DOE Link to this project: Energy Efficient SIP Ballard House Seattle WA

To explore other Zero Energy Ready Homes, visit the Department of Energy’s Tour of Zero page.


Affiliated Members

BASF Corporation

Houston, TX
Premier SIPS

Puyallup, WA


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