Membrane / Discussions

What is the best way to do a cottage reno adding an insulation blanket?

...membrane on sheathing as you will then be airtight, and if you add 6 inches of rigid foam insulation you would have R24 and a warmer ‘vapor barrier’ surface of ...

Posted by Barton Rowe Feb. 28, 2021, 1:27 p.m. Wall assemblies - renovation 2 Responses

What is the best practice to insulate a crawl space floor?

...membrane on the dirt to keep moisture in the ground. Are you by chance laying down any new flooring on it? Wondering if you had a plan for an air and vapor ba...

Posted by austin Fanning March 16, 2020, 8:55 a.m. Crawl spaces 4 Responses

When using larsen trussees, what is the maximum spacing between TJIs

...membrane to the outside of the trusses and then 2x4 horiontal strapping so siding shhould have lots of support. i don't have much experience with dence packing ...

Posted by steve outlet March 6, 2020, 12:39 a.m. Wall assemblies - renovation 3 Responses

What is the best way to insulate the exterior walls of an older home?

...membrane on the boards, followed by 2 inches of insulation, strapping and siding. That will only ad up to about R8, which is a lot better than you have, if yo...

Posted by Geoff Kavanagh June 30, 2020, 4:01 p.m. Wall assemblies - renovation 1 Responses

What is the best material to use on top of plywood for water proofing?


Posted by Babak K July 27, 2020, 12:22 a.m. Air and vapour barriers 3 Responses

Should you insulate an A-frame cottage with cathedral ceiling from the exterior or interior?

...membrane. You can see our Air Barrier DIY install video here , and with knowing your climate zone we can go over options together.

Posted by J Genereaux Oct. 26, 2020, 10:38 a.m. Roof assemblies - renovation 1 Responses

What type of Insulation can I use on the exterior of my home?

...membrane hardly offers any thermal protection at all. A 1920s home would not have been built with an interior vapor barrier , but as it likely has multiple co...

Posted by Scott Muller April 18, 2019, 2:19 p.m. Wall assemblies - renovation 6 Responses

How do you fix radon and water infiltration in a dry stone foundation?

...membrane. Read more here about removing radon gas from crawlspaces and basements . The problem is then that you really shouldn’t walk on it much or risk perfo...

Posted by john flannery July 14, 2020, 4:24 p.m. Foundation and basement improvements 5 Responses

Is EPS or XPS better for use in basement rim joists? Should faced or unfaced foam boards be used?

...membrane then it is even less permeable that XPS, because the foil itself is a vapour barrier. See this page all about rigid insulation panels - The differenc...

Posted by Thomas Dispenza Sept. 8, 2019, 12:43 a.m. Basements improvements 6 Responses

Combo structural sheathing, WRB and thin insulation panel in Ontario?

...membrane, which is for sure a vapor barrier, and you wouldn’t want that on the exterior of a wall in Ontario. The BP product looks to be more breathable, that...

Posted by Steve Bull Jan. 14, 2020, 6:06 p.m. Walls and Roofs 3 Responses

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

...membrane is if anything a way to get inspectors to sign off on your work. Because it is laid out in building code, they often won’t allow you to build without...

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

Why do you shim up basement walls?

...membrane is bulk water infiltration. If you have water that comes in regularly, you are better to deal with that either with exterior grading away from the hous...

Posted by t b March 2, 2021, 3:17 p.m. Basements improvements 4 Responses

How do insulate a basement slab that is sloped ?

...membrane, 2" XPS and osb/plywood achored with tapcons. The problem here is that there's a significant slope to a central drain (4" at the lowest). I will be rem...

Posted by Louis-François Lapointe Nov. 11, 2020, 10:34 a.m. Basements improvements 1 Responses

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

...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 , bu...

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

Where can I find supplies for a green roof?

...membrane with primer as the last line of defense, but that actually becomes the ‘backup’ membrane since once you lay down the poly root barrier (the green one i...

Posted by Nadia Naderi Oct. 8, 2020, 6:38 p.m. Roof coverings 1 Responses

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

...membrane, and manufacturers claim it is 100 times less permeable compared to standard poly of the same thickness. If a Radon Block barrier is more than you ca...

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

Is sealing basement concrete floor against radon a good idea?

...Membrane ? That is not a liquid sealer, and is used to stop radon gas from entering below basement floors, but it is used before you pour the floor, not after. ...

Posted by Tim Hanrahan Sept. 18, 2020, 3:11 a.m. Radon in Homes - Mitigation 3 Responses

What is the best way to insulate a 1780 brick federal with stone foundation in New York?

...membrane and drainage as well. To do the outside I would propose that you install a dimple drainage matt , along with a weeping tile drained to daylight if you ...

Posted by carole roseman Jan. 5, 2020, 2:39 p.m. Foundation and basement improvements 1 Responses