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

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

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

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. Foundation and basement improvements 2 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. Air and vapour barriers 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

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

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 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

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 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

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 4 Responses

Where is the correct vapor barrier location in Chicago?

...6-mil poly vapour barrier, or you could use a specific vapour barrier paint, and you could even use a varnish. Any of those would prevent diffusion of moisture ...

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

What is the best way to install basement insulation with existing framing?

...6-mil polyethelyne vapor barrier, which is normally installed on the walls of new homes and renovations over the last couple of decades. Poly works on above gra...

Posted by Nick Trotta Sept. 20, 2021, 8:29 p.m. Foundation and basement improvements 7 Responses