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Old 05-11-2010, 04:50 PM   #1
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Not sure about using vapor barrier


We have enclosed a section of our screened-in porch to make a mudroom/laundry room. We have heard different opinions on whether of not we need to use a vapor barrier under the drywall. We live in northern IN where the winters are cold. What is the right thing to do and if a vapor barrier is needed, do we use it on the ceiling also?

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Old 05-13-2010, 10:22 AM   #2
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Not sure about using vapor barrier


There are many varied opinions these days. Most people are concerned about vapor barriers in basements where concrete or block foundations are involved. I wouldn't use one on wood framed walls. I use glue and nails (you can opt for screws) on wood framing. The vapor barrier over the studs would negate the use of adhesive which adds strength and reduces nail/screw "pops"....

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Old 05-13-2010, 10:23 AM   #3
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Not sure about using vapor barrier


Yes, you do need a vapor barrier on all walls and ceilings...you can use faced insulation or you can use unfaced and use 4 mil plastic (preferred) the vapor barrier always faces the warm side of the room
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Old 05-13-2010, 10:31 AM   #4
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Not sure about using vapor barrier


I agree with using faced insulation and was assuming the OP was asking about the plastic. I have to disagree for the reasons stated above from the drywall perspective. It's not done in this area....
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Old 05-15-2010, 08:21 AM   #5
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Not sure about using vapor barrier


The location of the vapor barrier depends on the climate. Beware of generalized advice!
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Old 05-15-2010, 03:26 PM   #6
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Not sure about using vapor barrier


http://www.buildingscience.com/docum...ecommendations

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Old 05-17-2010, 08:03 PM   #7
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Not sure about using vapor barrier


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Originally Posted by GBR in WA View Post
According to that article, no vapor barrier is required in California (zone 3) where I am. So the inside of walls would just be insulation or is there something else that replaces vapor barriers? What about vapor retarders or air barriers?

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