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Modern Issaquah Neighborhood, WA
Award winner
House in Hollow
Washington
Project Type Residential | Single Family > 3000 sf
Year Completed 2021
Project Size 1950 sq ft
SIPS Used 6" EPS Walls & 10" EPS Roof
Sustainable Features Premier SIPS, solid wood w/low VOC cabinets, low or no VOC and non-toxic interior paint and finishes
Environmental Certifications Net Zero/Zero Energy Ready
Awards 2022 BEA Runner Up High Performance Homes Under 3K S/F
Architect TC Legend Homes
Contractor TC Legend Homes
Project Overview
House in Hollow - Bellingham, WA
End Use: Measuring 1950 square feet, this Department-of-Energy certified Net Zero clerestory design has a central kitchen and a 1st-floor aging-in-place floorplan. Designed for an Alaskan couple whose love of the outdoors demands a house that is fully engaged with the landscape, plenty of daylight is admitted and access to outdoor living is easy.
Why SIPs: SIPS were the walls and roofing for the house. The energy shell is formed using the system: 6.5” SIPs walls, 10.25” SIPs roof,’ with 4” slab-on-grade concrete mass insulated from below with 4” of R20 foam. For energy efficiency, time, and contribution to the carbon footprint, SIPs were the only consideration.
Benefits of SIPs: TC Legend built this net-zero house through the winter of 2020/ 2021. With SIPs, we were able to build mid-winter. SIP's roof panels swung in on a crane through the blowing snow! SIPS saves us on build time, labor, and construction costs. The tight energy envelope also helps our clients save on energy costs, and to achieve high-efficiency building certifications/ awards.
Innovative Design Elements:
- Passive Solar Design
- Slab on grade concrete mass insulated from below with 4" R20 foam
- Openings are plugged with Vinytek Triple Pane Boreal Windows and Thermature Fiberglass Doors
Certifications:
- 5-Star Built Green
- Dept. of Energy Certified Net Zero
HERS: -23
Blower Door Test: 0.54
HVAC: Advances in TC’s mechanical systems determined that the radiant tubes embedded in the 4” concrete slab will serve as a backup heating system to handle abrupt cold snaps, with the day-to-day heat and cool being delivered via the Zehnder Comfopost, a heating/ cooling coil that sits in the ventilation delivery ducts. The Comfopost coil is driven by the Chilltrix CX34 heat pump, along with a further fan-coil heat/ cool unit located in the 2nd-floor rec-room.
Air-source heat pump, Electric, 3.5 COP / Air-source heat pump, Electric, 23.0 EER.
Energy Saving and/or Energy Efficient Materials Used:
- Window: U-Value: 0.170, SHGC: 0.330\
- Slab: R-20.0 Edge, R-20.0 Under
- Above Grade Walls R-29.0
- Ventilation System Balanced: HRV, 81 cfm, 32.0 watts.
- ir-source heat pump, Electric, 3.5 COP.
- Air-source heat pump, Electric, 23.0 EER.
- Water Heating: Heat pump, Electric, 3.10 EF, 50.0 Gal.
- ENERGY STAR exhaust fan vented to outside - Zehnder Comfoair 550
- Interior Floor Lighting (%) 0.0
- Range/Oven- Electric
- Interior LED Lighting (%) 100.0
- Clothes Dryer - Electric
- Refrigerator (kWh/yr) 596
- Clothes Dryer CEF 3.94
- Dishwasher (kWh/yr) 270
Solar Panels:
- NET-POSITIVE 10.56 kW
- -Manufacturer: Panasonic
- Model: 320w
- Qty: 33
- Inverter:
-Manufacturer: Solar Edge
-Qty: 1 - Total kw: 10.56
Find Your Local Rep
As the oldest SIP manufacturer, Premier SIPS offers a superior building envelope framing system for commercial and residential structures. Contact an expert in your region to discuss your next project or to explore the benefits and cost savings when designing and building with SIPs.
