How Much Attic Insulation Do I Need

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

How much attic insulation do i need.

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Looking to install blown in insulation but don t know how much you need. When adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. How much insulation in attic for zones 1 4.

Existing 3 4 inches of insulation. How much insulation do i need in my attic. Add the right kind of insulation. In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill.

Use unfaced insulation when adding more insulation to an attic that already has some insulation laying the rolls or batts at right angles to the floor joists. The insulation in your attic should be at least 12 thick. In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill. The average recommended level is 14 inches of r49.

If your attic insulation is only a few inches thick or if you can see the ceiling joists you re wasting money on your heating and cooling bills. Whether you need a wall insulation calculator or an attic insulation calculator lowe s blown in insulation calculator has you covered. Use our roll insulation calculator to estimate the amount of wall insulation crawlspace insulation or attic insulation you need for your project. Recommended insulation levels for retrofitting existing wood framed buildings.

Our tool can act as a rolled insulation calculator a wall insulation calculator and even an attic insulation calculator. The higher the r value the better the thermal performance of the insulation. 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. The thicker the better.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. If your insulation doesn t measure up and you need more installation can be done as a weekend diy project or you can call a professional installer to handle the job. Add insulation to attic. According to the u s.

Then check out our handy insulation calculator.