Vapor Barrier on ceiling

jdcole

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

Bob Mariani

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

Gary in WA

#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

Gary

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jdcole

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