Vapor / Discussions

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

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

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 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 1 Responses

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

...vapor barrier0 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

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 2 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

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

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. What is almost certainly happening is that warm,...

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

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

...vapor barrier' potentially trapping moisture in the roof deck causing long term issues given Naples is hot and humid. I was of impression open cell foam is an...

Posted by Arthur Moore April 6, 2020, 12:57 p.m. Roof assemblies - renovation 0 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 I create a complete air barrier using a vapour retarding primer?

...vapor retarder primer is an option since you've dealt with air leakage), or an interior air/ vapor barrier like the standard 6-mil poly. Feel free to give som...

Posted by Mihai Wilson May 3, 2018, 10:15 p.m. Wall assemblies - renovation 1 Responses

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

...Vapor barrier paint in the U.S. ) is more of a solution for walls rather than ceilings to prevent the indoor vapour drive during hot humid weather. The reason a...

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

How do you do a Vapour 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

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

How you vent a metal roof?

...vapor barrier. What is recommended at this stage of the install of the roofing assemby? Air or Vapor barrier? install two layers of 1 -1/2 inch EPS expand...

Posted by Kim jarrett July 12, 2019, 12:15 p.m. Roof coverings 3 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