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U

U-value (W/(m2K))

It is a scalar size to measure the insulation features of components or material. The warmth transition coefficient (U-value) indicates how much warmth per degree temperature difference passes through one m² component size between the inside and the outside surface. The U-value replaces the well known K-value and is defined by new European regulations.

Under insulation

It is wood protection and helps to protect against humidity on components of a roof construction or a ventilated facade. It also protects outer surfaces from wind and therefore from warmth loss.