What Is the Best Basement Insulation Strategy for an Older Home? – GreenBuildingAdvisor

I am planning to improve the insulation in the basement of an older home and want to choose an approach that will help control moisture, improve energy efficiency, and make the space more comfortable throughout the year.

The basement has concrete foundation walls, and I am considering different insulation options such as rigid foam boards, spray foam, or insulated framing. I am particularly concerned about condensation, moisture movement, and whether the insulation should be installed directly against the foundation walls or with an air gap.

What would be the most practical basement insulation strategy for an older home? Are there any common mistakes I should avoid when selecting materials or installing the insulation?