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Old 02-03-2011, 10:10 PM   #1
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Vapor Barrier retrofit question

I am currently starting into renovating our first home. One issue we quickly found was the 2nd floor master bedroom was freezing!, one issue is poorly run HVAC (for another posting) and the other is the exterior walls were very cold. For the first porject, i decided to strip two of the exterior walls and found ZERO insulation! the previous owners had drywalled over plaster lathe after upgrading the electrical and did not insulate.

Anyway, I have stripped the walls, levelled out the existing studs with 2x2 and re-framed the main window. I installed R-22 Roxul and am going to vapor barrier then drywall.

My question is: since I have only stripped 2 of the 3 exterior walls (the third is finished with two closets so i did nto want to tear them apart), and there is no vapor barrier between the ceiling and attic, How do i properly seal the edges of the vapor barrier to the ceiling and existing walls?

If i use acoustic sealant around the perimiter, there is still a .5 to 2" gap between that and the existing structure, will this be a problem for moisture? is there a way to properly seal the edges before drywall?

Thanks for anay help you can provide!


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Old 02-04-2011, 06:05 AM   #2
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Paint has often been called an adequate vapor barrier. I would not worry too much about the attic. But is the insulation there OK??? At least 12"?? If you reinsulate that part of the attic, the fisrt layer could be faced.


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Old 02-04-2011, 06:39 AM   #3
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As long as your vapor barrier is always to the inside, you won't have a moisture issue. The heat from the inside of your home will keep the vapor barrier above dew point so moisture cannot condense.
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Old 02-05-2011, 12:29 AM   #4
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