Air seal versus insulation
9 of 11 from Chasing efficiency in green homes (photos)
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Another common display at green-building conferences is a demonstration of the differences between different types of building insulation. In the past few years, sprayed-in foam insulation has come into favor because it not only insulates a wall cavity or attic, but also seals, which prevents conditioned air from leaking out. This display has air blow from below to show how air flows through fiberglass but much less through foam, allowing foam to retain more heat.
March 12, 2010 7:31 AM PST
Photo by: Martin LaMonica/CNET
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