DOE Tour of Zero: Howell Street by TC Legend Homes
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TC Legend Homes built this 788-square-foot accessory dwelling unit behind the homeowners’ existing house in Seattle, Washington, to the performance criteria of the DOE Energy Zero Energy Ready Home (ZERH) program.
The walls of this house are constructed using 6-inch structurally insulated panels with an insulation value of R-29. The seams of the panels are taped, and the cement board siding is caulked at all seams to prevent air leaks.
The triple-paned, vinyl-framed windows offer exceptional insulating values.
The 10-inch-thick SIP panel roof is fully covered with ice-and-water shield and offers a complete thermal, air, and water barrier to protect the home from the elements.
For increased energy savings, this home has ENERGY STAR appliances, advanced LED lighting, and water-saving plumbing.
Clerestory windows fill the home with daylight.
The entire home’s heating and cooling needs are met by one ductless mini-split air-source heat pump.
“Our houses are designed from the ground up to take advantage of the sun.”
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“Our houses are designed from the ground up to take advantage of the sun. A passive solar layout … means lots of windows facing south and few facing north. The long axis of the house is east to west to allow for maximized solar exposure for a future PV system and for passive solar heating.”
– Ted Clifton, builder, TC Legend Homes