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

Should I insulate a crawl space from the outside?

...poly down on the floor which has brought the humidity down to a reasonable 38% (within 5% of the rest of the house). At this point I'm planning upgrades to th...

Posted by Ryan Argente March 7, 2021, 5:07 p.m. Crawl spaces 0 Responses

How do you improve an old block foundation with no insulation or exterior moisture barrier?

...poly? If so - remove the poly it will hold moisture in the wall when it needs to be able to escape. That's why its wet and moldy. Read here first - Why baseme...

Posted by Wilhelmina Lange March 11, 2021, 4:19 p.m. 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

Should I install a poly moisture barrier before the rigid foam board against a basement wall?

...Poly against the wall for moisture and radon protection, 2" rigid XPS foam board insulation held in place with the special plastic pegs (since the poly will not...

Posted by DONandCATHY Crenna Dec. 14, 2020, 2:21 p.m. Basements improvements 3 Responses

Where does a vapour barrier go when building a shed in southern Ontario?

...poly and be done with it. Certainteed is more expensive that a standard poly, but if you aren’t installing AC, its an unnecessary added cost.

Posted by Charley Nelson Nov. 5, 2020, 10:09 a.m. Wall assemblies - new construction 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

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

With a raised house how should I insulate underneath?

...6-mil poly unless you close it in. What climate zone are you in (or nearest city), and are you keeping it open all around? I live in southeast Louisiana about...

Posted by Kevin Marmillion Feb. 1, 2021, 11:43 a.m. Basements improvements 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

Can you use an HRV or ERV for radon removal in a dirt floor basement?

...poly membrane of some kind. Either simply a standard 6-mil poly vapor barrier you would see in cold climate walls, or a radon proof membrane for basement floors...

Posted by Douglas Touart March 1, 2021, 5:15 p.m. Radon in Homes - Mitigation 1 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

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

Which insulation should I use under my cottage?

...6-mil poly on the floor you mentioned. That will keep the moisture in the ground and help you avoid mold and be much more comfortable by keeping the humidity in...

Posted by denis maurier May 3, 2021, 11:14 a.m. Crawl spaces 3 Responses

Should I bother testing for radon in a gutted and uninsulated house?

...poly on top. Could I dig say a 12"x12"x12" pit underneath the EPS, fill it with gravel, put in the intake end of pvc pipe, cover with EPS, poly and seal? Is the...

Posted by Luba Sharapan March 27, 2021, 12:04 p.m. Radon in Homes - Mitigation 3 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