Membrane / Discussions

Is the ZIP sheathing system good or bad for water control?

...membranes is to always have a positive lap when joining two pieces of membrane together; However, this is not possible when just slapping on a piece of special ...

Posted by Trevor Prinz Nov. 26, 2019, 4:03 p.m. Walls and Roofs 5 Responses

is a double vapor barrier on a South Florida roof bad?

...membrane under roof panels but have been advised I would be creating a 'double vapor barrier' potentially trapping moisture in the roof deck causing long term i...

Posted by Arthur Moore April 6, 2020, 12:57 p.m. Roof assemblies - renovation 0 Responses

Can you provide Crawlspace Insulation Design Assistance?

...membrane products stapled to the underside of the joists; I was planning on securing the membrane with firring strips to get a better seal and to prevent the fa...

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

Is There a Difference Between an Air Barrier and vapor barrier?

...membrane. Is there any other option available to me? Your diagnosis seems pretty accurate with the exception that it would technically be the air barrier and no...

Posted by Sherri Mccormick Aug. 17, 2018, 3:24 p.m. Roof assemblies - renovation 3 Responses

How do I waterproof a foundation from the inside?

We have a self-adhesive membrane on the outside wall of our foundation but the water enters through the joint between the walls and the floor. How can I waterp...

Posted by Kurt Brenner Nov. 14, 2017, 9:47 a.m. Foundations and Basements 1 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

Do you have on a category on insulating vans?

...membrane. There are two companies we know of that have switched to more environmentally friendly blowing agents , Elastochem and Demilec. And below is a link ...

Posted by chantal fortier April 14, 2019, 2:08 p.m. Tiny house 1 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

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

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

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

Can basement walls to dry to the inside with foam board?

...membranes, unless there has been a footing membrane included and I’ve never seen one installed that was at my doing. You an image of what a footing membrane loo...

Posted by Tim Hanrahan Aug. 20, 2020, 12:34 a.m. Basements improvements 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

Can you use polyiso insulation on the exterior of a wall behind cedar siding on the west coast?

...membrane on each side to contain the gases, and that foil is a vapor barrier . Using it on the outside means you are installing an exterior vapour barrier and...

Posted by Iain Matheson Jan. 28, 2020, 10:38 p.m. Wall assemblies - renovation 1 Responses