illustration of house with insulation batts in the rafters
Illustration: Ian Worpole
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Batts in the Rafters

Simply jamming batts between the rafters of a cathedral ceiling or insulated attic will interfere with the roof's ability to breathe. The resulting buildup of moisture can soak the insulation (nullifying its R-value), foster the growth of mold, or even rot the framing. The illustration at left shows how Tom Silva maintains adequate ventilation and avoids those problems.
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