What's a thermal bridge?

Thermal bridges are weaknesses within a building's structure where heat and/or cold is transferred at a substantially higher rate then through the surrounding envelope area. There are basically two types of this phenomenon: geometric thermal bridges where part of the structure projects through the building envelope, and material thermal bridges where materials with different conductivity are used in combination. In practice, these effects often combine. A classic example of this is the balcony slab, where problems occur if the connection is not given serious consideration.

The thermograph photograph above shows that if thermal bridges at balconies are not taken care of, the balconies act as “cooling fins”; conducting the heat off the building and cooling the rooms adjacent to the balconies.

The effect of thermal bridges

  • Higher energy consumption

Due to the thermal outflow at the balcony connection, heat is drawn from EVERY ROOM resulting in a significant rise in heating costs and energy consumption.

  • Mould formation

Interior temperatures of the adjacent rooms can drop well below the dew point. This leads to condensation, deteriorates plaster and paintwork and is an ideal condition for harmful mould formation! If there is sustained exposure to condensation, the building is subject to serious deterioration.

Uncomfortable living space

  • Cold surface temperatures cause uncomfortable living space for occupants


Schöck Isokorb® are load-bearing thermal insulation elements which forms a thermal break between the balcony and the interior floor while transferring load and maintaining full structural integrity. Also, the warmer interior temperature is maintained decreasing condensation, and preventing the formation of mould.