Vapor barrier / Discussions

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

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

...vapor barrier. I have to install studs to the interior of the block for seismic resistance and attach the studs to the block. The block walls will basically bec...

Posted by Scott Brekke Nov. 22, 2019, 9:37 a.m. Basements improvements 1 Responses

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

...vapor barrier i.e. the side closest to the insulation. The vapor barrier is dry to the touch from inside the basement. The answer is actually pretty easy but no...

Posted by David Mitchell Aug. 14, 2018, 6:32 p.m. Basements improvements 13 Responses

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

...barrier and not the 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 ...

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

...barrier is okay? How do I convince the building inspectors? I can see how it doesn’t exactly look like a vapor barrier in the diagram as it is black, but it is ...

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

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

...barrier over the cellulose on the inside under the drywall, will I then cause vapor to be trapped between the outside vinyl /foam board and poly barrier. The fo...

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

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

Can you use a vapour retarder paint on the ceiling instead of using a poly vapour barrier?

...barrier joins in with your walls? Vapour barrier paint (or Vapor barrier paint in the U.S. ) is more of a solution for walls rather than ceilings to prevent the...

Posted by Anwas Qwelten June 8, 2019, 3:56 p.m. Air and vapour barriers 2 Responses

What do you do about plastic over upside down insulation in crawlspace

...vapor barrier over dirt floor. Can I just put a plastic vapor barrier over the insulation to stop moisture from from getting into the insulation? Instead of tea...

Posted by Lisa Milne May 13, 2020, 12:57 p.m. Crawl spaces 0 Responses

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

...barrier as an air barrier. Keep in mind that poly vapor barriers in homes with air condition are a problem in some locations, what climate zone or city are you ...

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

Why is there mold on particle board outside vapor barrier on new addition?

...vapor barrier) and difficult to escape on the other side (OSB) is likely part of the problem. The other thing at play here is the interior vapor barrier and air...

Posted by Christine ML June 7, 2020, 1:35 p.m. Wall assemblies - renovation 1 Responses

is a double vapor barrier on a South Florida roof bad?

...barrier but not a vapor barrier, would the moisture only travel one way? I have read one option is to a/c the attic space, another is to install the 'peel and...

Posted by Arthur Moore April 6, 2020, 12:57 p.m. Roof assemblies - renovation 0 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

What is your advice on exterior wall insulation for a tiny home?

...vapor barrier, I see no mention of insulation for you Tiny House, but there is a comma after vapor barrier so I’m wondering if you accidentally posted b...

Posted by Mitch Fowler Aug. 27, 2020, 7:04 p.m. Tiny house 1 Responses

How do you best use polyiso insulation in a basement?

...vapor barrier & ½” gypsum drywall, sealed with drywall sealer and painted with vapor barrier paint. What problems do you see with this detail? Thank you Polyi...

Posted by Iain Matheson Jan. 24, 2020, 7:45 p.m. Basements improvements 1 Responses