Basement renovations / Discussions

What is the best way to insulate a basement concrete floor?

...Basements: Why Encapsulation is the Best Upgrade for Older Foundations

Posted by dean c May 1, 2026 Basements improvements 1 response

Can I use a dimpled membrane and Isorad panels for basement wall insulation?

...basement renovations we try to always point out that you should never put a vapor barrier on an interior basement wall unless you are trying to grow mushrooms inside the wall. Read here about why basements are moldy and how to prevent mold when finishing a basement

Posted by David Perreault May 1, 2026 Basements improvements 1 response

How to deal with condensation in basement?

...basement is finished? Finishing a basement in a cold climate like Minnesota requires careful management of the "dew point" to prevent hidden mold (see here to better understand the dew point in homes.) Since you plan to keep the existing vapor barrier against the concrete, the biggest risk is moisture getting trapped b...

Posted by Shane Hu Aug. 7, 2025 Basements improvements 1 response

How to properly insulate rim joists embedded in concrete in a home built in 50s?

...basements, and poses exactly the risks you are hearing about - that insulating them can trap moisture and cause them to rot. There are pages here about how to finish basements - How to insulate basements properly without causing mold or rot We are of the opinion that the heat loss is preferrable to rotten joists, so I ...

Posted by GP Mitchell May 30, 2025 Foundation and basement improvements 2 responses

What is the best insulation for basement walls?

...basements Why basements are moldy and how to avoid it Choosing the best insulation for basement renovations Those pages should help a lot, but a few things to mention - I see your point about how the uneven walls will be tricky if you count on rigid foam boards against the concrete to stop the inward drive of moisture...

Posted by Paul D March 28, 2025 Basements improvements 1 response

What is the best insulation for concrete block foundation wall and basement stud wall system?

...basement walls. She wants to spray foam the rin joists and  apply 2" of foam on the walls with the stud wall being installed 1" from the block wall. However I  am concerned that concrete block needs to breath, based on what I have read on this site, and that the temperature of the block will now be colder with the insu...

Posted by Don Fraser Dec. 8, 2021 Foundation and basement improvements 2 responses

How do can I insulate an existing basement floor from 1906?

...basement is only 21% of total under house footage. 79% is crawl space. Basement Never painted. Walls go up 4 ft to a 2ft wide ledge and then the old stone foundation. 1 side is an exterior wall; 3 sides are crawl space beyond the stone.  A lot of heat is lost through uninsulated basement floors, so good idea to fix tha...

Posted by Cathy Gaskins Feb. 18, 2021 Basements improvements 3 responses

Should I put foam boards right against my basement wall or leave an air gap?

...basement to our home has no insulation with a cinderblock wall that they have either applied white paint or drylok to, can't tell though. The basement is also a walkout so three sides are exposed to air while the front of the house is underground. My question is should I apply 2 inch foam board to the inside of the wal...

Posted by Elijah Hargett Jan. 9, 2021 Foundation and basement improvements 4 responses