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.
How many inches of insulation does an attic need.
The average recommended level is 17 inches of r60.
According to the u s.
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In zone 5 the average minimum requirement for attic insulation is 11 inches of r38 fill.
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.
Once you ve determined the r value of insulation you need to decide which type of insulation you will use.
The average recommended level is 17 inches of r60.
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.
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.
In zone 6 the average minimum requirement for attic insulation is 14 inches of r49 fill.
Inspecting your attic insulation.