In zone 5 the average minimum requirement for attic insulation is 11 inches of r38 fill.
How many inches of insulation does an attic need.
Once you ve determined the r value of insulation you need to decide which type of insulation you will use.
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.
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Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values.
Inspecting your attic 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.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.
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.
The average recommended level is 17 inches of r60.
In zone 6 the average minimum requirement for attic insulation is 14 inches of r49 fill.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.