adding vapor barrier to existing ...: "I have an existing wood frame metal building that was ..." - Clay Zimmerman (11/8/2013) | I Have An Existing Metal Roof and Have A Question

I have an existing wood frame metal building that was built without bubble wrap or any kind of vapor barrier under the roof metal. I now wish to put in a ceiling and blow in cellulose insulation. But what about condensation on the roof? I did not want to tear off the tin to put on bubble wrap and then reinstall it but one builder said the barrier needs to be right next to the tin. I was hoping I could tack up the barrier to the bottom side of the 2x4 nailers. this would give me a 1 1/2" air space. Can someone enlighten me? Yes, I know I do need to vent the attic space.	Clay Zimmerman 11/8/2013	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/18968/find/
A vapor barrier is a good idea and I do not see any problems with your planned placement of it.	Todd Miller Isaiah Industries, Inc. 11/9/2013	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/18969/find/
Against the nailers or directly behind the drywall is fine.	Eric Novotny An informed customer is the Best Customer! 11/11/2013	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/18970/find/

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adding vapor barrier to existing metal roof