# Tips for Calculating Correct Amount of Blown-In Insulation Tips for Calculating Correct Amount of Blown-In Insulation

Blown-in insulation is a good choice when deciding to add additional insulation to your home. Blown-in insulation is relatively easy to use and can be installed in the average size space in one day. In order to complete this job, you will need a few special tools such as an insulation blower or a hole saw for your drill. The most important part of a blown-in insulation project is making sure that you have the right amount of insulation.

#### Measure the Space

You need to determine the size of the area you are planning to insulate. Use a tape measure to get an accurate measurement if the area is open. If you are adding blown-in insulation to enclosed walls, you will have to make a good guess.

#### Determine the R-Value Desired

The R-Value is a measure of how well the insulation works; the greater the R-Value the more insulated an area. If you already have insulation in the space, you will need to determine the R-Value of the insulation and subtract it from the desired R-Value. For example, if you want an R-Value of 38 and you already have insulation measuring an R-Value of 20, you only need to add an R-Value of 18.

#### Calculate the Proper Amount of Insulation

Blown-in insulation comes in a number of different R-Values. If you are choosing one with an R-Value of 3 per inch, you can achieve an R-Value of 38 with just 13 inches. Here is the formula: (R-Value per inch)/(total desired R-Value) = Number of inches of insulation required.