Saturday 6 March 2021  

Thermal bridges

Thermal bridge occurs on a surface, a line or a point with an increased heat flow. The reduced thermal resistance at these areas causes increased heat loss, because the surface of heated spaces at these areas is cooling faster which leads to larger differences between the surface and air temperatures. Warmer air has the ability of absorbing larger quantities of water vapour, which, in cold areas, condenses into water. With time, this condensation develops into moulds, and plaster or even rendering begin to fall off. Moisture laden air, and forming of mould as its consequence, have a negative effect on comfortable living and the health of the building’s occupants.

What is the solution?

The climate in an enclosed space can be improved by rising the temperature and with more frequent ventilation, but this is an inadequate, only temporary solution, as it results in unreasonable increase of energy use for heating.
Certain thermal bridges cause a non-visible dampness inside the construction itself, and with constant presence of moisture laden air the building material will suffer damage.
The best solution to this problem is to prevent thermal bridges when designing the building or during the building process itself. In case of an existing building, thermal bridges need remedial work.As thermal resistance of the construction elements needs to be increased (to reduce thermal transmittance) at the areas of thermal bridges, this means that additional thermal insulation should be installed.

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