Double Vapor Barriers in Vaulted Ceiling


Old 01-17-02, 02:04 PM
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Double Vapor Barriers in Vaulted Ceiling

We are constructing a small guest house in a very cold (but relatively dry) place. All the insulation contractors quoted for R38 unfaced batts in the vaulted ceiling void (14 inches deep vs 10.5 inches for the batts so the ventilation should be good). They also specified 4 mil poly vapor barrier to the interior. However, the fellow who got the job put in quite a few paper-faced batts with the paper to the exterior - the cold side. Because of other aspects of the installation which we have found very unsatisfactory (serious squashing and a few areas being missed altogether), we are wondering if having vapor barriers on both sides of the insulation is good, bad, or irrelevant. We still have some flexibility with the ceiling, but this may have been done with the walls which now have the drywall on.

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Old 01-17-02, 05:43 PM
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Location: Arlington, WA
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No, No, No!! The vapor barrier goes towrds the conditioned side of the ceiling ONLY! (DOWN, towards the room.) Since the sheetrock isn't in yet, pull down the batts with the kraft side up and turn them over.
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