Vapor barrier seal

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Posted by: from Toronto
1/25/2017 at 9:00:37 PM


I have a question about basement vapor barrier. My home is 2 years old. Basement is pored concrete and the builder has insulated everything. A few days ago I noticed that the plastic membrane is not tightly attached at the floor, maybe the caulking sealant is coming off. I attached 2 pictures. My concern is, does the vapor barrier has to be air tight? is it even possible? or is it normal to have some open areas?

Thank you

Vapor barrier seal
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Date/Time1/25/2017 at 11:04:02 PM

Resealable using tape and acoustic caulk.

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Date/Time1/25/2017 at 11:56:56 PM

Dear Customer

If your wall was above ground i would make sure it was chalked along floor for sure. If you want to chalk it wont hurt, it keeps any cold air from meeting warm air, condensing and yellowing the drywall overtime...especially in extremely cold weather. If your planning to drywall and put baseboards then it will be enough to push tight and seal anyways so i personally would not worry. All joints,need acoustical sealant or be tuck taped.

Hope this helps.

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Date/Time2/1/2017 at 2:56:55 PM

This is Todd from Hasaca Construction.

If you are really concerned about the vapor barrier coming off the 2x4's there is an easy fix. You can get a cheap caulking gun and a tube of acoustical sealant at Home Depot. Ask them to show you where the sealant is and how to use the caulking gun. Cut the plastic tip on the acoustical sealant tube at a 45 degree angle so that a pencil can just fit through the hole. Using a screwdriver or pencil you have to poke the inside of the tube (through the plastic tip that you just cut) so the sealant can come out of the tube. Apply sealant to the 2x4 and press the vapor barrier back against it to seal it back up. Staple the vapor barrier to the 2x4 BELOW (at the floor) the new sealant for extra support so it doesn't come off again.

This is most likely not a critical repair that will lead to any significant issues if you don't do it but if you want peace of mind, this is how you can fix it.

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Jullian in Toronto
Date/Time2/17/2017 at 1:09:45 AM

Thank you very much for the kind replies. There is a lot to learn for a new home owner. Really appreciate your time.

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