How much insulation in attic for zones 1 4.
How many inches of insulation does an attic need.
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.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
This calculator is to be used as an estimating tool only.
The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.
For loose fill cellulose this translates to a total depth ranging from 8 inches.
Therefore a 3 1 2 inch wall cavity filled with fiberglass batts has an r value of 10 15 to 13 3.
The average recommended level is 17 inches of r60.
Most batt insulation carries an r value of 2 9 to 3 8 per inch.
Inspecting your attic insulation.
In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
This calculator is to be used as an estimating tool only.
Add the right kind of insulation.
Fiberglass and rock wool batts are probably the most popular options and are easy to install in unfinished walls and attics.
The higher the r value the better the thermal performance of the insulation.
The higher the r value the better job the insulation does at preventing the transfer of heat.
Input length width and desired r value of the area to be insulated.
In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
How well a particular insulation works is expressed by the r value which ranges from 2 0 to 8 0 per inch of insulation.
Input length width and desired r value of the area to be insulated.
Having enough insulation in your attic is one of the best ways to save energy on both heating and cooling your home.
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Depending on type you will need somewhere between 10 and 18 inches of insulation to meet the recommended insulation values.
The average recommended level is 14 inches of r49.
