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Old 07-24-2012, 03:42 PM   #1
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Vapor Barrier on ceiling


Hey DIY looking for professional opinion on something. I am remodeling my third floor and in the process of removing the old drywall I found what looks like cardboard under the drywall. I removed the cardboard from the walls and insulated and put vapor barrier.

On the ceiling however I have not removed the cardboard as I would rather not deal with the mess the insullation would make or have to replace it in the crawl space.

The question is, can I or rather should I put vapor barrier over this cardboard then my drywall or should I bite the bullet and remove it first?

I do not see any mold or water damage on the cardboard at this time and my attic is vented properly.

Thanks for any help.
Jason

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Old 07-27-2012, 10:23 AM   #2
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Vapor Barrier on ceiling


In your climate zone use the plastic as a vapor barrier. Be sure to seal all seals carefully

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Old 07-29-2012, 12:56 AM   #3
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Vapor Barrier on ceiling


#10 under "Recommendations for vapor retarders": http://www.buildingscience.com/docum...doctypes/diges

Pages #18, 19 for walls: http://www.buildingscience.com/docum...nd-wall-design

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Old 07-30-2012, 03:22 PM   #4
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Vapor Barrier on ceiling


GBR,
Thanks for the info. I think I have my answare. The cardboard is a vapor retarder. If I leave it in place and put the polly vapor barrier it will cause a problem between the two.

Thanks
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