Punktförmige Wärmebrücken bei Verblendmauerwerk

Punctual thermal bridges in faced brickwork - influences, consequences and energetic optimization.

The rising heat insulation level of external structural components that entails a high insulation thickness of up to 20 cm means that for exterior wall structures with faced brickwork the necessary construction elements such as brickwork support brackets and cavity wall ties also need to be developed. Here the focus of attention, in addition to secure load transfer in the context of protruding lengths of up to approx. 30 cm, is also increasingly on heat insulation aspects, because brickwork support brackets and cavity wall ties penetrate the insulating layer and thus constitute a thermal bridge. The influence of these thermal bridges on thermal transfer increases as the planar thermal resistance of exterior wall constructions increases. If the relevant influencing factors are known, these thermal bridges can be significantly reduced through innovation in heat insulation especially in the area of brickwork support brackets. The appropriate design concepts allow accurate quantification of the additional heat loss through punctual thermal transmittance coefficients χ in the context of energy-optimised construction and thus the planning of economical insulation thicknesses.