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Insulating Basement/Foundation
Second only to insulating the attic, insulating basements and foundations walls is often a cost-effective home improvement. It's one that can also make the home more comfortable.
Basements that are used as living space and heated or cooled should have insulation separating the living area from the outside air or ground. If there is none, you can build a wall frame similar to the above ground walls, attach it to the basement wall, add insulating batts between the studs, and then apply wall board over it all to give it a finished look. Just be sure to use air barriers as recommended for your area. And check for moisture or drainage problems before covering an area with wall board.
Basements or crawl spaces that are not heated or cooled should have insulation under the floor since the floor is the barrier between the living space and what can be considered the outside. Batts can be inserted between the floor joists and secured with flexible metal tongs or laced in place with wire wrapped around nails or held up with chicken wire. Make sure vapor barriers are used appropriately. In all but the most humid parts of the country they should face up or toward the living space.
Also, insulate the rim joist, the area on top of the foundation where floor joists abut the rim joist. Fiberglass batts cut to fit snugly, spray foam or pieces of rigid insulation can be fitted into the rim joist area. Check local recommendations on vapor barriers.
