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National Grid - Deep Energy Retrofit by Habitat for Humanity

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Open House Info:

House was orginally built in the late 1940s at 720 sqft. Abandoned by the previous owner, Habitat purchased the house from the town of Williamstown, MA. Habitat collaborated with Ann McCallum of Burr and McCallum Architects to expand the house to include a half second story with bedrooms. As for all Habitat homes, this retrofit project has depended on donated materials and labor. Technical guidance provided by National Grid and Building Science Corporation along the way was crucial for helping the many volunteers reach the high construction standards demanded by the DER program. The super-insulated enclosure includes an exterior insulation wall build-out, high performance windows, efficient heating equipment, ventilation with heat recovery, and careful attention to air sealing. The test figure for air tightness of the completed house is 2.4 ACH @ 50 Pascals. Here are some of the highlights of this Williamstown Cape retrofit project:  Roof: R-60 with up to 18” loose fill cellulose in the attic  Walls: R-36 with 4” of XPS rigid foam on exterior and dense- pack cellulose in cavities  Basement walls: R-20 with XPS rigid foam on interior walls  Basement floor: R-10 with 2" XPS rigid foam  Windows: R-5 Paradigm triple-glazed argon low-E double-  Doors: R-5 Jeld-Wen insulated fiberglass units Heating and DWH: 95% efficient DOE AFUE condensing boiler with 52 gal. indirect water heater  Ventilation: Balanced ventilation with 67% efficient Heat Recovery Ventilator The house is located on Route 2 at the North Adams - Williamstown line.

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