How Much Attic Insulation Do I Need

Use our roll insulation calculator to estimate the amount of wall insulation crawlspace insulation or attic insulation you need for your project.
How much attic insulation do i need. In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill. The thicker the better. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. It is not uncommon to see 15 to 20 of insulation in a well insulated attic.
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 higher the r value the better the thermal performance of the insulation. Existing 3 4 inches of insulation. Recommended insulation levels for retrofitting existing wood framed buildings.
Whether you need a wall insulation calculator or an attic insulation calculator lowe s blown in insulation calculator has you covered. The insulation in your attic should be at least 12 thick. How much insulation in attic for zones 1 4. According to the u s.
How much insulation do i need in my attic. When adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill. Looking to install blown in insulation but don t know how much you need.
Our tool can act as a rolled insulation calculator a wall insulation calculator and even an attic insulation calculator. 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. 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. 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.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Then check out our handy insulation calculator. Add the right kind of insulation. Add insulation to attic.
The average recommended level is 14 inches of r49.