First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.
How many inches of insulation attic.
This calculator is to be used as an estimating tool only.
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 your attic to reach r 30 if you live in zones 2 or 3.
The average recommended level is 17 inches of r60.
This calculator is to be used as an estimating tool only.
Input depth of existing blown in insulation in inches.
According to the u s.
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.
Input length width and desired r value of the area to be insulated.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
Input length width and desired r value of the area to be insulated.
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.
In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended.
Inspecting your attic insulation.
In zone 4 the average minimum requirement for attic insulation is 11 inches of r38 fill.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
In zone 3 the average minimum requirement for attic insulation is 9 inches of r30 fill.
This calculator is to be used as an estimating tool only.
Click the button to calculate the approximate r value for this job.
Once you ve determined the r value of insulation you need to decide which type of insulation you will use.
For loose fill cellulose this translates to a total depth ranging from 8 inches.
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.