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

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

Guide describing how to insulate closed crawlspace walls and band joist areas with rigid foam board insulation.

Vapor retarder plastic should not be installed over fibrous insulation on basement or crawlspace walls unless rigid foam or spray foam is installed directly against the concrete, behind the blanket insulation.

Guide describing different options for providing seismic and thermal resistance for homes with basement foundations, crawlspace foundations, or crawlspace foundations with a "cripple" wall.

Guide describing how to retrofit an existing basement floor or slab to reduce moisture issues.

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

Guide describing how to install a radon-mitigating vertical ventilation pipe in new and existing homes with various types of house foundations.

Guide describing how to install a radon mitigation fan with various types of house foundations.

Guide describing the need for covers on sump pumps in the basement or crawlspace of a home.

Guide describing how to insulate a basement to improve the overall thermal performance of the building and provide more dry, usable conditioned space for home occupants and HVAC equipment.

Guide describing how to air-seal sill plates in single-family homes and multifamily buildings.

Guide describing how to create a capillary break at all crawlspace floors using polyethylene sheeting to manage moisture in crawlspaces.

Guide providing information about treating bulk water drainage issues and moisture control measures in existing basements and crawl spaces.

Guide describing installation of sump pumps in the basement or crawlspace of a home.

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.