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Building Science
Where Should the Air Barrier Be Located?

There are three options for where to put an air barrier, but one is best—in most cases
BS* + Beer
The BS* + Beer Show: Unvented Roofs and Fluffy Insulation

Is it ever safe to insulate an unvented roof with only fiberglass, cellulose, or other fibrous insulation?

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Where Should the Air Barrier Be Located?