Even if your basement is unheated, your home could be significantly losing heat through the basement walls.
Basement wall insulation can cut energy losses and reduce moisture and drafts, making your home more comfortable; especially vital if you live in a particularly warm or cold climate (or are in an Iron Maiden cover band).
If you already have basement insulation, insulating basement walls to a higher R-value can provide additional energy savings and help lower home heating costs. The R-value indicates how well insulation stops heat flow. Make sure your insulation has an R-value of at least 11. Rolled insulation is typically rated at about R-11 or R-12. The ideal R-value for your particular basement wall insulation will vary based on your climate. R-20 is recommended for colder climes.
Before installing basement insulation, seal air and water leaks in your basement walls, or insulation won't be as effective. Types of insulation include fiberglass batts, cotton, cellulose, rigid foam board, mineral wool—even
recycled blue jeans!
1. Measure your basement walls to determine how much insulation you'll need, and then go to a hardware store and ask for advice on which insulation is appropriate for a basement in your area.
2. If you're installing fiberglass insulation yourself, make sure you don protective clothing, safety glasses and a dust mask or respirator before you start working with the insulation.
3. Seal air leaks and water leaks prior to installing the insulation, and use an expanding foam sealant to seal the joint between the mudsill and foundation.
4. Measure the height of the walls again before cutting insulation batts.
5. Read and follow the instructions that came with the insulation for specific installation guidance. Be sure the insulation lies flat against the walls.
6. Cover the insulated walls with drywall or wood paneling, which should be positioned at least 1/2 inch off the floor.
Types of insulation for finished and unfinished basements. If you have a finished basement with empty wall cavities, you should hire a pro to fill the spaces with blown-in insulation. You can insulate the walls of an unfinished basement yourself.