Vapor / Discussions

Why is there condensation behind my vapor barrier?

...vapor barrier and then drywall today while putting up drywall noticed that the vapor barrier is covered with condensation how do I stop the condensation. Have p...

Posted by John Young Oct. 11, 2021, 4:50 p.m. Wall assemblies - new construction 1 Responses

Where is the correct vapor barrier location in Chicago?

...vapor retarder or vapor barrier on the warm side of the insulation, meaning you need to install it at the top of the joist cavity before the insulation. There c...

Posted by Joel Peerson Jan. 31, 2021, 7:31 p.m. Air and vapour barriers 2 Responses

The thickness of vapor retarding latex paint - Is measurement wet or dry?

...vapor retarder primer (vapor barrier paint) in our Edelweiss LEED Platinum Demo House instead of a 6 mil poly vapor barrier , it was for the walls not the floor...

Posted by Kim Boas July 24, 2020, 10:36 a.m. Basements improvements 3 Responses

How do you apply vapor barrier and insulation to a CMU house?

This house is located in SC and is built with 8" block walls. What is the best way to insulate and apply vapor barrier. I have to install studs to the interior...

Posted by Scott Brekke Nov. 22, 2019, 9:37 a.m. Basements improvements 2 Responses

Should a Vapor Barrier be installed over Exterior Grade Plywood?

...Vapor Barrier to be necessary? Thank-you Michael Vapor barriers can be a problem with homes that are air conditioned, because it reverses the vapor drive. When ...

Posted by Michael Klauck March 6, 2020, 1:24 p.m. Air and vapour barriers 1 Responses

How do you remove water droplets from under a crawl space vapor barrier?

...vapor barrier? Water is acculating on the dirt side of the vapor barrier. If I crawlspace has water droplets forming under the poly vapor barrier (on the dirt...

Posted by Paul Racioppo Feb. 7, 2020, 3:49 p.m. Crawl spaces 3 Responses

Do I need a standard 6 mil poly vapor barrier with dense cellulose exterior wall?

...vapor to be trapped between the outside vinyl /foam board and poly barrier. The foil faced foam board is not completly tight against the underlying shingles and...

Posted by jeff Chormann May 1, 2020, 9:18 a.m. Air and vapour barriers 2 Responses

How can I get rid of moisture between the vapor barrier and the insulation in a basement?

...vapor barrier in your comment above, I would use NO vapor barrier, or at the least choose one that lets moisture escape such as Certainteed breathable vapor bar...

Posted by David Mitchell Aug. 14, 2018, 6:32 p.m. Basements improvements 42 Responses

Is There a Difference Between an Air Barrier and vapor barrier?

...vapor barrier that is compromised, though it may well be the same product so that is kind of splitting hairs. This page explains it clearly - The difference b...

Posted by Sherri Mccormick Aug. 17, 2018, 3:24 p.m. Roof assemblies - renovation 3 Responses

Should I vent the space between a block wall and vapor barrier?

...vapor barrier using 6 Mil plastic and hold the new walls a few inches off of the block. I am worried about the moisture that makes it past the Drylok and it sto...

Posted by Nick Santore Oct. 10, 2020, 2:03 a.m. Basements improvements 1 Responses

Is there anything I can do about a vapor barrier on the wrong side of a basement wall?

...vapor barrier and then drywall. So the vapor barrier seems to be on the wrong side to allow drying. I had one corner where baseboard was showing signs of dete...

Posted by Iain B Feb. 8, 2021, 2:21 p.m. Basements improvements 7 Responses

Is a vapor barrier necessary under a concrete slab with foam insulation and if so, where does go?

...vapor barrier down before or after the EPS foam insulation and as there's a chance of radon what specification of vapor barrier do I need, plus can this do the ...

Posted by Grady 22 Aug. 17, 2019, 12:19 p.m. Air and vapour barriers 3 Responses

How do you do a vapor barrier in a dense pack cellulose wall?

...vapor barrier , strapping and drywall. And to be clear, you absolutely need a vapor control layer of some kind on the warm side of the insulation to be complian...

Posted by Ian MacKay July 26, 2018, 2:48 p.m. Wall assemblies - renovation 4 Responses

Does using T & G wood plank instead of drywall affect where we put the vapor & air barrier?

...vapor’ barrier depending on your country) since there is little to no change to the R Value from drywall to wood. And further to that, wood can act as an air an...

Posted by Sue Colbourne Nov. 9, 2019, 6:16 p.m. Walls and ceilings - interior surfaces 3 Responses

How do you seal windows from the exterior for water and air but not create a vapor seal?

...vapor barrier. I am concern that taping it outside might cause the vapor sandwich which I want to avoid. I am not sure what you have done for 2015 model home fo...

Posted by Piyush Prince Nov. 7, 2018, 12:10 a.m. Windows and doors 1 Responses

How do you re-do the insulation on a old cabin from the outside?

...vapor barrier needs to be installed on the warm side of the insulation . Putting a vapor barrier on the cold side of insulation means that warm humid air migrat...

Posted by Raphael Couture Sept. 14, 2020, 8 a.m. Wall assemblies - renovation 3 Responses

Will spray foam on basement walls prevent condensation?

...vapor barrier and insulation while doing a project. I had never noticed any issue prior, no water on the floor and no smells. It was by accident that I noticed ...

Posted by Michael Scott April 12, 2021, 9:17 p.m. Basements improvements 3 Responses

Where should I put a vapour retarder?

...vapor barrier If you aren’t planning to add air conditioning it may be a lot of effort to mitigate a very minimal risk, so the big question really is about wh...

Posted by Jeffrey Connell March 14, 2020, 4:25 p.m. Wall assemblies - new construction 4 Responses