Walls -- both exterior and interior -- are the next area to insulate in a home. Rigid boards work best on exterior walls, along with a vapor barrier. Fiberglass batts, foam or cellulose can be used to insulate the interior walls. The third area that needs proper insulation is the floors.
Likewise, do I need to insulate my basement ceiling?
Basement ceilings can easily be insulated with unfaced fiberglass batts or blankets installed between the floor joists and held in place with wire, fishing line or spring metal supports called "tiger claws". Insulating the basement ceiling will keep most of the heat upstairs in the living space.
Which insulation is best for basement walls?
The best way to insulate the interior side of a basement wall is with foam insulation that is adhered to or sprayed directly on the concrete. Any of the following insulation materials are acceptable for this purpose: closed-cell spray polyurethane foam or either XPS, EPS, or polyisocyanurate rigid foam.
Do you need to insulate cinder block walls?
A: You can't. And there is no effective way to fill the voids in an existing concrete-block wall. Your only option is to cover the inside of the exterior walls with a continuous layer of insulation, as though you were insulating a basement wall.