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. 

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