How Much Insulation Necessary For Attic

Input length width and desired r value of the area to be insulated.

How much insulation necessary for attic.

Type and material of your insulation. Contractor or insulation installer s fee. According to the u s. 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 average recommended level is 14 inches of r49. According to home advisor insulating your attic can cost between 1700 to 2100. Square footage of your attic. Deciding how much insulation your attic needs is a matter of knowing the r value of your insulation material and the total r value you need your attic to meet then purchasing enough material to make the equation work.

The average recommended level is 17 inches of r60. Click the button to calculate the depth in inches and pounds of total insulation required for this job. In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill. The higher the r value the better the thermal performance of the insulation.

The insulation in your attic should be at least 12 thick. 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. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

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. Dallas texas falls in climate zone three where attics are recommended to have an r value between 38 49 this means a minimum of 12 of insulation. This calculator is to be used as an estimating tool only. 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.

In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill. The thicker the better. The main factors that impact the cost are. Add the right kind of insulation.