How to use the calculators

Select the calculator for which you would like to open a detailed user guide.

Detailed guide

U-value calculator

Guidance on construction layers, thermal conductivity, air layers, repeating thermal bridges, fasteners and other corrections, as well as calculations for structures in contact with the ground.

U-value calculator help

Detailed guide

Surface resistance calculator

Guidance on determining internal and external surface thermal resistance and on using the surface resistance calculator.

Surface resistance calculator help

Tip: the detailed U-value calculator guide includes explanations and illustrations for the individual input fields and special calculation options.