LEADING BUILDERS Recognizing leadership in home building
The renovation team replaced asphalt roofs with standing seam, used double-paned low- emissivity windows, and spec’d R-13 cellulose insulation plus 1/2” R-3 rigid insulation, house wrap, and integral foam insulated vinyl siding.
in blown-in attic insulation is a viable measure. In humid climates, burying ducts in attic insulation can raise concerns about condensation forming on the outside of the ducts. All aluminum double-pane windows
were replaced with double-pane low- emissivity windows with vinyl frames, which reduce heat loss, solar gain, and water condensation.
“A number of things we learned from this project we are applying to projects today.”
Within the sealed house, mechanical
ventilation occurs through a local exhaust fan rated at 80 cfm with a timer set for a 75% runtime. As a result of improved air tightness, the overall system sizing for each SEER-10 heat
pump was reduced by a ton for cooling (from 2.5 to 1.5 ton) and cut in half for heating.
Innovations Moy’s team replaced the asphalt shingle roofs with standing-seam metal roofing that is better able to withstand the region’s high summer temperatures and stiff winds. The old roof is stripped down to the roof
U.S. DEPARTMENT OF ENERGY RESIDENTIAL RETROFIT RESOURCES
This article has been excerpted from publications created as part of the U.S. Department of Energy’s Building America Program. DOE offers comprehensive, whole house technical information to the industry and consumers to encourage energy-efficient remodeling and retrofit practices in our nation’s existing homes. Visit the Residential Buildings website at
www1.eere.energy.gov/ buildings/
index.html to access useful resources, including Home Performance with Energy Star program information, case studies of successful retrofits in all climate zones, energy code and tax incentive information, guidelines for air sealing, solar, and PV systems, and more.
50 GreenBuilder September 2010
sheathing. Thirty-pound felt is applied and dried in. On top of this, 1x4 furring strips are nailed to the roof at each truss. Along the roof’s peak, an aluminum screen is installed over the ridge gap for continuous ventilation. The metal panels are snapped in place over the trusses. “By having the metal off the roof on the 1x4 furring, the temperature differential is less [less heat is transferred through the metal roofing to the roof deck]. If it is hot, [the assembly] will carry this heat up toward the roof ridge. If it is cold, it will keep it from penetrating the house,” Moy says.
Housing Act homes in the Northwest, this whole-house strategy could save an estimated 588,670 million Btu/year. Don Clem, the CARB architect from
Steven Winter Associates, appreciates the collaboration and the building skill inherent in the Yakama Nation Housing Authority.
Dollars and Sense The total source energy savings over the pre-rehab home is 47% or 136.9 million Btu/year. Annual utility costs were cut nearly in half for each rehabbed home. If replicated across the 4,300 HUD 1937
Because the house is so tight, the overall system sizing for each SEER-10 heat pump could be reduced by a ton for cooling (from 2.5 to 1.5 ton) and cut in half for heating.
He reflects on the value of this project as an example of “bringing us back to the concepts of sustainability, which is where Native Americans started.” GB
www.greenbuildermag.com
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