Insulating your basement keeps your home warmer in the winter.
Insulating your basement ceiling is one way to reduce the amount of energy you use each month. Foam board insulation and blanket insulation are two types that are commonly used to insulate basement ceilings. To obtain the most benefit from your insulation, it must be properly installed and moisture control measures must be in place.
Identification
According to the U.S. Environmental Protection Agency, insulating your home is one of the most cost-effective ways to make it comfortable and energy-efficient. Your insulation works best and saves even more energy if proper air sealing and moisture control are also in place. How well your insulation works depends on your lifestyle, the climate where you live and the R-value (a measure of thermal resistance) of the insulation you choose.
Types
The most cost-effective insulation is one you can properly install yourself and is appropriate for the area you are insulating. Blanket insulation is often placed in unfinished areas of the home such as ceilings, walls and floors. This insulation is made from fiberglass, natural fibers, mineral wool or plastic fibers and comes in batts and rolls. Blanket insulation is easily installed, making it appropriate for do-it-yourself installation. Rigid foam board insulation is another type that is suitable for basement ceilings, as well as foundation walls and floors. Foam board insulation is made from polyurethane, polystyrene or polyiso and has a high R-value, even when thin foam boards are used. While there are many other types of insulation, many require professional installation to function effectively. Loose-fill insulation must be blown in with special equipment, requiring equipment rentals or installation by a professional contractor.
Installation
Proper installation is key to effectively insulating your home. Blanket insulation should be fitted between the joists, beams and studs of your basement ceiling. Foam board insulation should be installed in the same manner but must also have 1/2-inch gypsum board placed over the insulation. Other materials are available for this purpose, but they must be building-code-approved regarding fire safety.
Considerations
In addition to insulating your basement ceiling, you must seal all air leaks to make your home as energy-efficient as possible. Inspect all areas in your basement for gaps where air can leak in or out of your home. Caulk works best on gaps 1/4 inch or less, and spray foam works best on gaps 1/4 to 3 inches. Inspect your basement for signs of moisture damage, as insulation does not work effectively when it is wet. Excess moisture inside your basement can also cause mold growth, which is damaging to the structure of your home and a potential health hazard. Keep moisture out of your basement by cleaning all gutters and downspouts. When these areas become clogged, water can back up into your basement. If moisture is a problem in your basement, installing a sump pump can remove excess water.
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