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Spray Foam Interior Insulation for Existing Foundation Walls

Guide describing how to insulate an existing foundation wall by adding spray foam insulation to the interior side of the wall.

Rigid foam insulation and a thin slab were installed over the dirt and gravel of this sealed crawlspace

Exterior Insulation for Existing Foundation Walls

Guide describing how to insulate a new foundation wall or an existing foundation wall by adding rigid insulation to the exterior side.

Unvented concrete masonry unit crawl space with exterior insulation - designed for termite resistance in moderately infested areas

Publication Date

Tue, 01/01/2013 - 12:00

Insulation for Existing Crawl Space Floors

Guide describing how to upgrade a crawlspace floor in an existing home by adding insulation.

Unvented, Insulated Crawlspaces

Guide describing methods for insulating an unvented crawlspace or conditioned basement with rigid foam on the interior side of the walls to provide an insulated space for HVAC equipment.