ETW: Building Profile: Retrofit - Belchertown, MA 18th Century Cape Comprehensive Retrofit

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This retrofit house is located in Belchertown, MA (Cold Climate). It involved adding R-56 closed-cell spray foam insulation in the rafter cavities and over the face of the rafters. A new 2x4 wood frame wall was added leaving 1” gap from the existing wall and R-32 (5” min.) closed-cell spray foam insulation was installed in existing wall cavities and into the gap beyond. New aluminum-framed storm windows were installed over existing double-glazed low-E wood-framed windows.  3” to 5” of closed-cell spray foam insulation were added to the interior of the existing rim joist and foundation wall. A new basement slab was cast with 2” XPS rigid insulation under the slab.

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For complete details on this deep energy retrofit project, go to
National Grid Deep Energy Retrofit Pilot Program–18th Century Cape Comprehensive Retrofit