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Old 03-08-2010, 03:18 PM   #1
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attic vapor barrier


Should there be a vapor barrier between the atic and the conditioned room below it? Be it plastic liner or faced insulation with the face down? Thanks!

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Old 03-08-2010, 04:19 PM   #2
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attic vapor barrier


Yes. In your climate a vapor barrier should be on the warm side of the insulation as a simple answer.

A definition of a vapor barrier is not absolute, but is just a number selected to separate materials between being "vapor barriers" and not being " vapor barriers". all it takes is 1/2 mil of thickness to throw poly into a differen category even though they have a range from .5 to 6. Other materials can be much better. - On top of this is the installation that is even more importanr in the real world. Multiple layers may be used if the difference is below a specified limit, but few people are able to handle the calculation and design.

Dick

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