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Show Insulation Tips Duct Insulation Duct In nonthermally con-, ditioned areas should be in-; sulated with two-inch flexible or one-inch rigid insulation. . Insulation . See that insulation extends: over the top of the top plate; behind band joists ; over soffits of cantilevered floors; around cracks in doors, windows and odd-shaped cavities, with a vapor barrier applied over these areas; into narrow spaces between studs, with a vapor barrier over these areas; and behind pipes, wires , and electric outlet boxes in outside out-side walls. Batt ends should be tight against each other and against top and bottom plates in wall cavities. |