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vapor barrier


mopar44o's Avatar
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Join Date: Jan 2013
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CANADA

08-13-14, 04:18 PM   #1  
vapor barrier

So I'm redoing my kitchen and tore the drywall down on the exterior wall and noticed the wall had vapour barrier on the inside... That's not normal as far as I know. ny reason why would it be done?

 
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XSleeper's Avatar
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08-13-14, 04:25 PM   #2  
That *is* normal, especially in a cold climate.

 
mopar44o's Avatar
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08-14-14, 05:49 AM   #3  
I always thought It had to be against the exterior wall.... this is why I used spray foam when I did my basement.. **** is confusing...

 
stickshift's Avatar
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08-14-14, 06:06 AM   #4  
The vapor barrier, if installed, goes to the warm side of the wall. In cold climates (yours and mine), this is the inside of the wall.

 
Bud9051's Avatar
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08-14-14, 07:03 AM   #5  
mopar, confusing is correct .
Vapor barriers have been redefined as vapor diffusion retarders and classified into different levels, link below. So some materials like spray on foam will still allow some small amount of moisture to pass.

Then there is the new siding job where they add a layer of foil faced foam to the outside before the new siding. To prevent that from becoming a condensing layer they suggest the foam be thick enough that the inside surface will always be above the dew point for each particular climate.

But despite all of the guidance for where to place a vapor barrier, the most important part of the job is sealing all of the air leaks. Taping joints and filling around wiring and plumbing penetration is top priority. Another link on sealing

I hope this helps.
Bud

Vapor Barriers or Vapor Diffusion Retarders | Department of Energy

http://www.efficiencyvermont.com/ste...ide_062507.pdf

 
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