6-mil poly / Discussions

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

...poly 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. T...

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

Can you provide Crawlspace Insulation Design Assistance?

...6-mil poly membrane is essential above all else for comfort, durability, energy efficiency, and air quality. You mention putting the poly membrane on the floo...

Posted by Randy Christensen Dec. 10, 2019, 12:17 p.m. Crawl spaces 1 Responses

Does paint work instead of a poly vapour barrier?

...6-mil poly is meant to be the air barrier as well, which is very different, read more here – The difference between air barriers and vapor barriers and how to...

Posted by Bill Fletcher May 6, 2020, 1:46 p.m. 1 Responses

How do I create a complete air barrier using a vapour retarding primer?

...6-mil polyethylene) is used as both the vapour barrier AND air barrier, but air leakage and vapour diffusion are actually two entirely different things . I’m ...

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

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

...poly vapor barrier , it was for the walls not the floor. As for thickness, that is what we would call a bit of a concern with using it as a vapor barrier, it is...

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

Can I put a breathable peel and stick weather (air) barrier on the inside walls and ceiling?

...polyethene. If you pre-seal the joints in the poly with acoustic seal and even cover the staple holes, I think you could achieve a comparable air barrier but at...

Posted by Anomika Singhn Oct. 1, 2018, 9:56 p.m. Air and vapour barriers 1 Responses

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

...poly interior vapour 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 ...

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

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

...polyethylene vapour barrier partly because we already had an Air Barrier in place as you mentioned. For the ceiling we did use a 6-mil poly barrier, as building...

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

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

...poly 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 com...

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

Which is the best basement insulation?

...6-mil poly barrier between the EPS and the stud wall. See more about basement construction here – Best practices for basement construction for new homes and r...

Posted by Alex Kesheshian April 23, 2020, 12:29 a.m. Basements 1 Responses

How do you prevent moisture from getting into a basement footing?

...poly vapor barrier on top of the footing before the forms for the foundation walls are installed. So once the concrete walls are poured, moisture can’t pass bet...

Posted by Frank Liu June 24, 2020, 9:58 a.m. New foundations and slab-on-grade 1 Responses

Can you help with passive solar greenhouse exterior wall details?

...6-mil poly barrier. Best insulation - maybe Rockwool, it is unharmed by moisture. Same for the rigid insulation, EPS and XPS will stop moisture, Rockwool will...

Posted by Rick Carter Aug. 11, 2020, 8:06 a.m. Greenhouses and Sunrooms / Solariums 1 Responses

My window drips when I run my air conditioning. What is the fix?

...poly vapor barrier? Before coming up with a solution you really need to be sure of the problem. Poly vapor barriers can cause exactly such a problem in a hous...

Posted by Sean Sullivan Aug. 27, 2020, 10:36 a.m. Heat pumps, geothermal and AC 5 Responses

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

...6-mil poly vapor barriers as a radon barrier, which is better than nothing, but I’d want a thicker one for my home. There is a barrier called Radon Block, whi...

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

What insulation should I put on basement block walls that is resistant to mold?

...poly vapor barrier on the walls if that's where the moisture issue is coming from. If it's a poured concrete floor and it has no vapor barrier beneath then that...

Posted by Ken Gee July 31, 2019, 3:25 p.m. Basements improvements 3 Responses

Can you install foam boards directly against basement walls?

...poly vapor barrier behind it, if not, I would make sure to use breathable materials. The best insulation for a basement stud wall in your case would be mineral ...

Posted by Ted Gorab Oct. 3, 2019, 6:09 p.m. Basements improvements 4 Responses

How do you prevent walls from rotting in humid climates?

...poly vapour barriers. From a design and quality of work point of view, we have many pages on durability that I will point you to, but I will give you a quick ...

Posted by Rose Alderson Nov. 5, 2018, 4:34 p.m. Wall assemblies - new construction 1 Responses

How do I stop a leak from my attic?

...poly vapor barrier , seal any penetrations then insulate on top. The problem with the insulation batts blocking the soffits is easily solved with venting, then ...

Posted by Markus Duess Feb. 11, 2019, 12:42 a.m. Roof assemblies - renovation 1 Responses