Green homes

The key to home energy efficiency is its envelope. Here, the ceiling insulation is a spray-on material that expands to 100 times its size, sealing air leaks.
chi-green-house_chomes_0116jan16-insulation-photo

( Susan Biddle/Washington Post )

The key to home energy efficiency is its envelope. Here, the ceiling insulation is a spray-on material that expands to 100 times its size, sealing air leaks.

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