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

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

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

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

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

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

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

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 help with passive solar greenhouse exterior wall details?

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

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

Basement reno - How do I effectively insulate my basement?

...poly, r12 fiberglass insulation, and tar paper everywhere except laundry room, mechanical area, and beside stairs. Total basement sqft is approx 800. Livable sp...

Posted by Steve J Feb. 13, 2019, 10:25 p.m. Foundation and basement improvements 2 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 you Insulate a 3 season cottage?

...poly vapour barrier, maybe strapping, then drywall. Strapping isn’t absolutely necessary and it will eat up a bit more space. It can help prevent drywall from c...

Posted by Terry Skindilias April 23, 2019, 9:27 a.m. Wall assemblies - renovation 4 Responses