Menu principale:

1. Increased transmission heat loss via the exterior building element.

2. Increase of the relative humidity due to decrease of the surface temperature.

In particular, the fact mentioned at last can cause another negative effect: formation of mould. Since mould only needs high relative humidity but no condensation water for the germination of spores,

1. Geometric thermal bridges.

2. Material thermal bridges.

In practice, overlap of both types can often be found, the „pure“ type is rather seldom. A typical factor for a geometric thermal bridge is an exterior corner. In the undisturbed wall, the surface which absorbs heat on the interior side has the same size as the exterior surface, which releases this heat again. Due to the geometry, the exterior surface of the corner is larger, resulting in a more intense cooling down of the interior surface, often particularly of the interior edge. The material thermal bridges in a building can be primarily found at surfaces and spots, where material with