Solar SIP Cabin Langley WA

Location: Langley, WA

Project Information

Project Type:	Residential, Tiny House < 900 sq. ft.
Manufacturer:
Builder:	Clifton View Homes
Design Professional:
Year Built:	2024

Performance

High Performance:	Yes
HERS/EUI Index Score:	-36
ACH50 - Blower Test Results:	1.44
kBtu/sq.ft./year:
CO2 lbs./sq.ft./year:

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

PROJECT DATA

• Layout: 1 bdrm, 1 bath, 1 fl, 550 ft²
• Climate: IECC 4C, marine
• Completed: May 2024
• Category: Custom

MODELED PERFORMANCE DATA

• ERI: without PV 37; with PV -36
• Annual Energy Costs: without PV $350; with PV $0
• Annual Energy Cost Savings: (versus typical new homes) without PV $700; with PV $1,050
• Annual Energy Savings: without PV 5,920 kWh; with PV 8,740 kWh
• Savings in the First 30 Years: without PV $29,700; with PV $43,900

KEY FEATURES

• Walls: SIPs, R-28 total: graphite EPS 6.5" SIPs, corrugated draining housewrap, 3/8-inch plastic furring rainscreen; cedar siding or zinc-aluminum-coated standing-seam steel roofing as siding on north sides.
• Roof: SIP roof; 10.25" graphite EPS SIPs, synthetic underlayment, zinc-aluminum standingseam steel roofing.
• Attic: Unvented, vaulted ceilings, 9.35" R-46 graphite EPS in roof SIPs.
• Foundation: Slab on grade, poured concrete, R-10 perimeter insulation and R-20 under full slab.
• Windows: Triple-pane windows, U=0.16, SHGC=0.36, low-e, argon-fill. Roof overhangs.
• Air Sealing: 1.44 ACH50; all SIP panels sealed with spray foam and tape.
• Ventilation: Range fan balanced to air intake with fan and 8-inch HEPA filter.
• HVAC: Ductless mini-split heat pump, 10.9 HSPF, 29.8 SEER; 1 outdoor head, 1 indoor head. Stained, sealed, insulated concrete slab and south-facing windows for thermal mass and passive solar heating.
• Hot Water: Heat pump water heater, 50-gal, 3.88 EEF. Core plumbing design.
• Lighting and Appliances: ENERGY STAR appliances.
• Solar: 7.2 kW, no battery.
• Energy Management System: Web-based monitoring of PV system.
• Other: Electric vehicle chargers. Three identical zero energy cottages on one tax lot.

To check out other Zero Energy Ready Homes, check out the Department of Energy’s Tour of Zero.

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