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 Installing blanket fiberglass insulation on the interior walls of a conditioned, unfinished basement as an alternative to best practice solutions.

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 air-seal and insulate the floor above an unconditioned basement or crawl space.

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 insulate a floor over an uninsulated basement or crawl space.

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

Guide describing different options for providing seismic and thermal resistance for homes with 'cripple' wall crawlspace foundations, which are known for their instability.

Guide describing principles of insulating and air sealing band joists as a stand alone energy upgrade, or as part of creating a closed crawlspace.

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

Guide describing how to insulate an existing slab floor by adding rigid foam insulation over the slab then installing a floating subfloor.

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

Guide describing method for insulating an unvented crawlspace or conditioned basement with rigid foam on the interior side of the walls.