Zero Energy SIP Montlake 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:
Year Built: 2014


High Performance: Yes
HERS/EUI Index Score: -1
ACH50 - Blower Test Results: 0.97
CO2 lbs./sq.ft./year:

Awards/Certifications: DOE Zero Energy Ready Home, ENERGY STAR Certified, EPA Indoor AirPLUS

Project Data:
• Name: Montlake Modern
• Location: Seattle, WA
• Layout: 4 bedrooms, 3.5 baths, 2 floors
• Conditioned Space: 3,192 ft2
• Climate Zone: IECC 4C, Marine
• Completion: May 2014
• Category: Custom
Modeled Performance Data:
• HERS Index: without PV 42, with PV -1
• Projected Annual Utility Costs: without PV $797, with PV $21
• Projected Annual Energy Cost Savings (compared to a home built to the 2012IECC): without PV $1,002, with PV $2,326
• Annual Energy Savings: without PV Electric (kWh) 15,367, with PV 25,067 kWh

• DOE Zero Energy Ready Home Path:
• Walls: R-6, 6-inch SIP walls; pre-finished fiber cement siding; draining house wrap
• Roof: R-46, 12-inch SIPs; metal standing seam roof
• Foundation: R-28 ICF slab edge, R-20 rigid foam under slab
• Windows: Triple-pane; vinyl-framed; lowemissivity; U=0.097, SHGC=0.62
• Air Sealing: 0.97 ACH 50
• Ventilation: 5.4-watt exhaust fan in laundry runs continuously at 30 cfm to meet ASHRAE 62.2, switch-controlled bath exhaust fans.  HEPA-filtered fresh-air intake with fan for passive makeup air but controlled to power on when 400-cfm range hood is turned on 
• HVAC: Radiant floor heat
• Hot Water: 5-ton air-to-water heat pump, COP 4.5 provides hot water for radiant floors and pre-heats domestic hot water; 50-gallon electric tank stores water and boosts temperature
• Lighting: 100% LED
• Appliances: ENERGY STAR refrigerator, dishwasher, clothes washer
• Solar: 9.7-kW PV system
• Water Conservation: Low-flow fixtures
• Other: PV monitoring system; programmable thermostats; electric car charging station; low/no-VOCs glues, adhesives, and paints

DOE link to this project: Zero Energy SIP Montlake 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


SIPA Website Sponsors