1. Definition and diagram of an insulating system

Thermal insulation system: a combination of two or more components, at least one of which is an insulating product or material. The performance of the system is the performance of the whole.

Thermal insulation: a material, product or system whose presence reduces heat transfer through the wall on, or in, which it is placed. It is characterized by its surface thermal resistance (expressed in m ² · K · W ^–1 ).