What is R-Value?

The R-value is calculated by using the thermal conductivity which is marked with k and by using the thickness of the material which is market with a t. The formula for calculating the R-value is R= t/k.

Using R-value for comparison the insulation material per millimeter of thickness is mostly used for conductive and convective heat transfer and it cannot be used for radiant heat transfer.

The American government has implied a rule that the R-value of the insulation material has to be disclosed to the consumers in the advertisements and before the purchase to make it possible for home consumers to compare different insulation material in a proper way. Thus, all the packages of insulation have to carry a marking which tells the R- value of that particular material.

Related Articles » Does expanding foam insulation absorb water? » How does your foam insulation help prevent mold & mildew? » I know insulation helps keep heat in during the winter months, but is there any benefit to having it » I am in the middle of an insulation project, but I accidentally tore the vapor retarder. Is repair n » What happens when I compress fiber glass insulation? » Can I Increase the Effectiveness of Fiber Blankets by Squeezing More into a Smaller Space? » How Do I Know What Width of Insulation to Purchase? » If I install a Vapor Retarder in My Attic, Do I Still Need Ventilation? » What Should I add to an Attic that Contains Existing Blanket or Loose-Fill Insulation? » What is the Most Effective Way to Cut Insulation?

User Comments:

Add your comment