illustration of house with fiberglass insulation
Illustration: Ian Worpole
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Fiberglass Insulation

Fiberglass batts, the insulation found in most houses in the U.S., are inexpensive and quick to install. Like other batt-type insulation, fiberglass has a predictable R-value if not compressed but is difficult to fit around obstacles without leaving gaps. In most climates, it needs a vapor barrier. Some builders rely on batts with attached kraft-paper facing to do that job, but Tom recommends unfaced batts, covered in plastic with all the seams taped shut.
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