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?
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"....
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
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....
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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