DIY Home Improvement Forum banner
1 - 2 of 2 Posts

·
Thread killer
Joined
·
306 Posts
Are the joist bays on the top of your basement wall insulated and air sealed? If not, the draft could be coming from there. And no, you don't want your wall to "breathe", use a can of foam and seal it up.
 

·
Thread killer
Joined
·
306 Posts
Ok it is my understanding that the 2" xps board allows some breathability through the board that is slow is this correct? So I seal around the entire foam board against the concrete correct?
The warm indoor air holds more moisture in a vapour than cold outdoor air. If you don't seal the leak where you feel the air, then you could have the vapour condensing in that spot. Then you get wet. Wet is bad, especially if you insulated enough to keep most of the heat away so it can't dry out anymore.
If you're interested, you can do a search and find all the technical details about insulating you could ask for here. Just look for posts from GBR in this section, he has good links in them.
 
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top