**It is simply the thickness of the insulation in inches divided by the thermal conductivity of the insulation. For example, a 2″ thick sheet of insulation with a thermal conductivity1 of 0.25 btu•in/h•ft2•°f has an r-value equal to 2 divided by 0.25 or 8.0.**

## How to Calculate R Value?

R-value is a measure of insulation’s ability to resist heat flowing through it. It’s a unit of thermal resistance – the higher the R-value, the greater the insulating power. Knowing the R-value of your insulation is essential when it comes to creating an energy-efficient home. But how do you calculate R-value? Read on to find out.

First, you need to determine the type of insulation you’re working with. Different materials have different R-value ratings, so you’ll need to know the type of insulation in order to calculate an accurate R-value.

Once you’ve determined the type of insulation, you can begin to calculate the R-value. The formula for calculating R-value is as follows: R-value = thickness of insulation material in inches/thermal conductivity of the material.

For example, if you’re working with fiberglass insulation that is 4 inches thick and has a thermal conductivity of 0.25, your R-value would be 16 (4 inches/0.25).

You can also calculate the R-value of multiple layers of insulation, such as when you’re using batt insulation

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