What is R-Value?

  R-Value is the rating used to measure insulations ability to resist heat flow. The greater the R-Value, the more resistant or effective the insulation is. When purchasing insulation you should do it based on its R-Value, not thickness or weight.

Facts About R-Value

  The thickness is not the determining factor for R-Value! The physical material maybe varied but the marked R-Value makes them the same. The testing for R-Value performance is done in a 70 F environment with no air movement. Knowing that your insulation is most need at the temperatures greater or lower than the testing results means the R-Value will be higher. Unless you have have air or moisture leaks which will lower and degrade your insulation R-Value in your house.

Three Common Insulation Types

  There are different types of home insulation materials, each having a different R-Value.

  Three of the the most common insulation materials are:

  Home Insulation R-Value of Blown in Cellulose Insulation is 3 to 4 per inch
  Home Insulation R-Value of Fiberglass Insulation is 3 to 4 per inch
  Home Insulation R-Value of Expanded Polystyrene is 4.00 per inch

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