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Old 08-23-2010, 05:32 PM   #1
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vapor barrier


hello i was just wondeing, i am building a mud room or walk in addition to my house it will be a cold room, northern climate, and i was wondering do i still need to put in a vapor barrier on the interier of the room i.e. inbetween the sheetrock and the insulation or will tyvex on the outside be enough any info will be greatly appreciated thanks

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Old 08-23-2010, 07:27 PM   #2
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vapor barrier


If the room is going to remain unconditioned I do not believe you will need any vapor barrier. The Tyvek has nothing to do with the vapor barrier aspect of things, it does help keep wind out but....the vapor barrier that you are talking about is to keep the air that you are "conditioning", whether it be heating or cooling out of unconditioned spaces. Not to protect any unconditioned air from the inside.

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Old 08-23-2010, 09:15 PM   #3
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vapor barrier


The vapor barrier needs to be installed on the warm side of the building envelope to be effective. This is suitable for areas where the winter is the dominant season and it gets extremely cold. In hot and humid areas, the vapor barrier is usually not needed.



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Old 08-23-2010, 09:43 PM   #4
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vapor barrier


The purpose of vapour barrier ir to keep the moisture in warm air from reaching the cold exterior side of the wall and condensing into water.Even if the room isn't heated it's probably warmer and moister than outside winter air assuming you live in Dakotas.Poly is cheap I'd put it up.
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Old 08-23-2010, 09:44 PM   #5
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The purpose of vapour barrier is to keep the moisture in warm air from reaching the cold exterior side of the wall and condensing into water.Even if the room isn't heated it's probably warmer and moister than outside winter air assuming you live in Dakotas.Poly is cheap I'd put it up.
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Old 08-23-2010, 09:49 PM   #6
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Quote:
Originally Posted by daveb1 View Post
The purpose of vapour barrier is to keep the moisture in warm air from reaching the cold exterior side of the wall and condensing into water.Even if the room isn't heated it's probably warmer and moister than outside winter air assuming you live in Dakotas.Poly is cheap I'd put it up.
Good point. I was just thinking a totally cold room but yeah even if it is only via solar it will be warmer, plus it is, I am assuming going to be attached to a conditioned space so that may warm it as well.
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Old 08-23-2010, 10:38 PM   #7
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vapor barrier


yeah that is what i was thinking also, it will be a cold room just added on to the house so there is no mud or rain or anything like that tracked in, think i will just add the plastic to the inside and get it done with, the only other question i have is, if i use faced or kraft insulation do i still need the plastic, or will i just be doubling everything.
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Old 08-24-2010, 12:24 AM   #8
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My preference is unfaced and poly.If you use faced don't use poly.Two VB is not good.
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Old 08-24-2010, 09:09 AM   #9
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yeah that is what i was thinking too, thanks guys for all the answers,

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