Poly / Discussions

Does paint work instead of a poly vapour barrier?

...poly vapour barrier, several coats of paint, and specifically oil paint can make a suitable vapour barrier. You can even buy vapor barrier paint / vapor retarde...

Posted by Bill Fletcher May 6, 2020, 1:46 p.m. 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 2 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

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

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

What is the best way to insulate the basement of an old house?

...poly is against the concrete or between the 2" layer of EPS and stud wall, as well as if poly extends to bottom of first floor or stop at top of concrete? Plus,...

Posted by Bryan Squirrell Jan. 14, 2020, 7:59 p.m. Basements improvements 1 Responses

Can I add Larsen Trusses and cellulose to 1920s House in Minneapolis?

...poly barrier on the outside as the R 40 gain from the trusses would stop any moisure from condensing on the poly. I would use 1/2" plywood for sheathing and a b...

Posted by Ken Traefald Feb. 17, 2020, 2:30 p.m. Wall assemblies - renovation 3 Responses

How do I condition my crawl space with a dirt floor?

...poly vapor barrier in the sand floor. i will then have to heat that crawl and put an fan it exhaust the air to outside. what should I do? and can the closed cel...

Posted by Ryan Reichelt Nov. 27, 2020, 12:25 a.m. Crawl spaces 0 Responses

With a raised house how should I insulate underneath?

...poly on the ground? my house backs up to a canal leading to a river and there is no draiage issues. Thank you in advance. I can’t speak to where you could find ...

Posted by Kevin Marmillion Feb. 1, 2021, 11:43 a.m. Basements improvements 3 Responses

Where is the correct vapor barrier location in Chicago?

...poly sheet at the top closest to the floor of the upper level or at the bottom on the side closest to the outdoors. Or I can maybe put on some vapor retardant p...

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

Should you allow air flow through a crawl space with a dirt floor?

...poly was layed on the dirt floor. The contractor's then placed pink insulation on top of the poly. We have a lot of moisture down there as the temperatures reac...

Posted by Amber Murray Aug. 17, 2020, 10 p.m. Crawl spaces 3 Responses

Can you provide Crawlspace Insulation Design Assistance?

...poly membrane is essential above all else for comfort, durability, energy efficiency, and air quality. You mention putting the poly membrane on the floor, any...

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

How do you best use polyiso insulation in a basement?

...Polyiso foam board : fiber faced (white) (IKO Therm 3) or the older product, Organic faced (gray) polyiso. Both products have visible 2mm (+/-) holes in both si...

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

Is there anything I can do about a vapor barrier on the wrong side of a basement wall?

...poly barrier. 3 - If I'm getting what you mean and the poly at the top of your wall is keeping moisture in the concrete, that's not a bad thing. Concrete is v...

Posted by Iain B Feb. 8, 2021, 2:21 p.m. Basements improvements 7 Responses

How do you insulate a crawlspace with dirt floor?

...poly on the dirt floor to keep the moisture out and to put rockwool in the ceiling of the crawlspace with no Vapor Barrier…. we would very much appreciate your ...

Posted by sal Bellicoso Oct. 30, 2019, 4:56 p.m. Crawl spaces 2 Responses

Followup to the question How do you install Larsen Trusses on a home in Minneapolis?

Perhaps my wording should have been, wrap the poly around the sheathing, then nail on the Larsen Trusses. My house like most in built in the early 1900's, has ...

Posted by Ken Traefald Feb. 27, 2020, 1:49 p.m. Wall assemblies - renovation 1 Responses

What do I in my basement where new insulation meets old?

...Poly vapour sheet and fibreglass insulation vs new Rockwool and EPS) How do address the areas where the EPS is adjacent to the old insulation? If I demo the...

Posted by Steve J July 20, 2019, 10:01 p.m. Basements improvements 2 Responses