Heat may escape through an uninsulated attic.
Understanding insulation and its uses can assist in selecting the appropriate type for your ceiling. Ceiling insulation serves multiple purposes: It keeps cold out in the winter and coolness in during summer. It acts as an added barrier for a home against varying temperatures. Choosing the right type and installation method maximizes its effect.
R-Value
One of the first things to look at when it comes to insulating a ceiling is the R-Value of the actual insulation. The R-Value of insulation refers to the amount of heat flow the insulation will block. Low will allow more heat to escape or cold to come in. The lower the R-Value, the more insulation is needed to provide adequate protection for the home. Manufacturers are required to list insulation's R-Value on the label. Consult with a professional for the appropriate level for your particular ceiling.
Battings or Rolls
If choosing to make installation of ceiling insulation a do-it-yourself project, batting or rolls may be the best option. Fiberglass and cellulose insulation are available in long strips, pre-rolled from the manufacturer. These rolls may be placed between the rafters in attics as ceiling insulation. The rolls may be cut to fit corners or oddly shaped areas. They require no special tools for installation, but protective clothing is recommended when working with fiberglass. Multiple layers of the rolls or batting may be stacked for added insulation, though it is noteworthy that compressed insulation loses it's R-Value. The depth of insulation needed varies with the composition but in general ranges from 3 to 5 inches.
Loose Insulation
Foam, fiber or pellet-form insulation is installed in ceilings by blowing with a special tool. This type of insulation is often referred to as "loose." Typically, professional installation is required. A pneumatic tool shoots the material into corners and across attic floors until the area is covered. Several layers may be blown on. Foam insulation expands as it is released for a more solid barrier. If selecting this option, consult with a professional for the best blow-in insulation for the specific ceiling.
Layering
If you find you need more insulation in a ceiling after initial installation, removal of the original product is not typically necessary. You may layer rolls of fiberglass or cellulose over blown-in product or blow in additional insulation over rolled. The key to layering is adding a lighter density or R-Value over a heavier grade. Lighter grades will compress and lose their effectiveness.
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