What is meant by K-value, R-value and U-value?

25 April 2017 Kingspan Insulation Middle East

K-value

Firstly, K-value indicates the ability of a material to conduct heat. Materials with low thermal conductivities do not easily allow heat energy to pass through. Normally, you would look for a material with a low K-value to insulate, as this will keep the cool inside he your building.

R-value

R-value refers to a material’s ability to resist heat transfer at a certain thickness. When looking for a material to insulate your building you would generally look for a material with a high R-value, and therefore, one that can resist heat transfer well. While K-value deals solely with just the material, R-value refers to the material and its thickness.

U-value

U-value assesses the rate of heat loss through a given thickness of a building element (roof, wall or floor). Ideally you would want a material which gains a small amount of heat in any given time, so you would want the U-value of a material to be low. When referring to the U-value of a building the R-value of all its different components will be considered.

We use cookies on our website www.kingspan.com. To find out more about the cookies we use, or to change your cookie preferences i.e. to remove your consent to our use of certain categories of cookies, please visit our Cookie Policy & Control page.

Please click "Accept and close" to accept the use of cookies on our website. If you do not click "Accept and close" but continue to use this website: you thereby consent to the use of all Kingspan's cookies and third party cookies for the purposes of improving performance, improving functionality and audience measurement, in accordance with the terms laid out in our Cookie Policy & Control page; and we will assume that you have read and understood our Cookie Policy & Control page.

The Cookie Policy & Control and Website Privacy Notice were updated on 13 August 2018.