November 2008
Attic Insulation 101: Are Your R-Values Up to Code?

One of the most effective ways of increasing your home's efficiency is by adding attic insulation, and many homes do not have the required amount of insulation in the attic.

Loose-fill insulation is typically the best choice for hard to reach areas and crevices. Choose from cellulose and fiberglass loose-fill insulation, both made of recycled materials. Fiberglass consists of 20 to 30 percent recycled material, and cellulose is made from waste paper and added chemicals that promote fire and insect resistance.

Call a professional insulation contractor to ensure the job is done safely and properly.

Research your county and state building codes to find out the minimum amount of insulation required. Most parts of Georgia require R-30 attic insulation. R-values measure insulation’s resistance to heat flow.

Check the insulation manufacturer's chart for the proper amount needed for your attic’s square footage. To ensure your attic is up to code after installation, count the number of bags used by the professional, not the thickness of the insulation. Then, compare the number of bags used with the manufacturer's recommended quantity.

The contractor should leave a card in your attic with details of the R-values installed.