Correction of Thermal Bridges
Extruded Polystyrene sheets (XPS) are indicated for the correction of thermal bridges.
A thermal bridge is generated by a discontinuity in shape or material of the structure of a building or by an interruption of the thermal insulation. Such situations generate a thickening of flow lines resulting from an increase in heat exchange. In a building the dissipation quota linked to thermal bridges may be higher than 30% of the total. They are generally present in correspondence of beams, pillars, floors, balconies and protrusions. The strong dispersions related to thermal bridges cool the structure giving rise to cold spots with consequent risk of formation of condensation and mold. Moreover, the superficial variations of temperature in the structure lead, over time, to a deterioration and a pulverization of the materials.
The strong thermal dispersions can significantly affect the total dispersion of the building to which a cooling of the structure is linked with the risk of superficial condensation. The latter can give rise to the formation of molds and particular types of mushrooms under suitable temperature and substrate conditions. Furthermore, the cold areas in correspondence with the thermal bridges reduce the thermal comfort of the environment and create convective air movements. The different temperature leads to different dilatations with degradation of the contact surface between the structural elements of the thermal bridge.