How effecetive is EPS as a thermal insulation material?
Extremely effective … essentially because stabilised air is such a good insulator. The thermal performance of a material is measured in terms of its resistance to the flow of heat. This thermal resistance is expressed in R values; The higher the number, the better the insulation. The R value of the most commonly used class is 0.57 for every 25mm of thickness. Thus, 44mm of EPS delivers an R value of 1. By comparision, 1240mm of concrete is required to provide the same R value.
