Vapor barrier below slab / Discussions

How do you prevent mold under flooring of a house on concrete slab?

...below the slab or planned for below the slab (vapor barrier or not and how much insulation), and will it be heated? Here are a few pages on how to build a sla...

Posted by Linds Cullen Dec. 31, 2020, 4:11 p.m. Slab on Grade 2 Responses

Can you insulate an existing slab on grade floor?

...vapor barrier below, and if not I’d be careful with those to avoid mold buildup. To test the moisture you could tape down 2 foot by 2 foot sheet of 6 mil poly v...

Posted by Patrick Berkeley Dec. 31, 2020, 10:14 p.m. Foundation and basement improvements 5 Responses

What is the best way to insulate rim joists with EPS and batts?

...below it. If you install several layers of EPS it will function just like a SIP wall, the foam boards will act as a vapor barrier and the thermal barrier. For a...

Posted by Steve J July 18, 2019, 3:53 p.m. Basements improvements 1 Responses

Should I vent the space between a block wall and vapor barrier?

...vapor barrier. I have no french drain or any drain sytem. I believe Im right when saying that that space between the block and barrier has to breath for the moi...

Posted by Nick Santore Oct. 10, 2020, 2:03 a.m. Basements improvements 1 Responses

What is the best way to Insulate the crawl space of an old home?

...barrier, it is best to keep the humidity to below 50% RH. Let us know what else you have down there, because if you insulate between the joists then it's likely...

Posted by Aj Jan. 21, 2020, 8:13 a.m. Crawl spaces 1 Responses

Can you use spray foam Insulation under a slab?

...vapor barrier, air barrier, or to insulate difficult areas like basement rim joists or to create a radon barrier in a crawl space it’s a great choice, but in mo...

Posted by Linda Martin April 6, 2020, 11:54 a.m. Slab on Grade 1 Responses

How well do Legalett slab on grades work?

...slab using Legalett ICF slab forms. 2) How are those issues usually addressed? What issues?! :) 3) What is the long term track record of Legalett slabs? ...

Posted by Steve Sykes Aug. 18, 2019, 3:21 p.m. Slab on Grade 1 Responses