How Many Inches Of Insulation Does An Attic Need

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How many inches of insulation does an attic need.

Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. Once you ve determined the r value of insulation you need to decide which type of insulation you will use. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. Add the right kind of insulation when adding additional insulation you do not have to use the same type of insulation that currently exists in your attic.

Department of energy it s recommended that attics have an r 38 to r 49 or about 12 to 15 of fiberglass or cellulose insulation. Fiberglass and cellulose insulation have r values of 2 9 to 3 8 per inch while sprayed foam insulation can go as high as 8 0 per inch. According to the u s. In zone 6 the average minimum requirement for attic insulation is 14 inches of r49 fill.

Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values. Inspecting your attic insulation. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.