In late 2008 my company contracted to do an energy retrofit on an 80-year-old home in the Boston suburb of Arlington. Energy efficiency is one of our specialties, so this wasn’t our first energy retrofit, but it was one of the most comprehensive.

Because the owner wanted to replace the roofing, siding, and windows anyway, we had an opportunity to increase the R-value of the shell and eliminate thermal bridging by wrapping the entire exterior with rigid foam insulation.

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