A comparison of thermal insulation with Interstitial condensation in different climate contexts in existing buildings in Europe

The work here presented investigates the risk of interstitial condensation between the existing masonry and the insulation using several materials and evaluates the water content inside the insulation (WCI) through various simulations in dynamic mode onto existing buildings located in different Countries in Europe. The insulation materials considered are specifically: natural fibre materials, mineral fibre materials and artificial materials. The scenarios were chosen considering different climate zone, according to the Köppen climate classification and the buildings buildings here analyzed are taken from TABULA in the years of construction from 1945 to 1969. The building typologies are single-family houses, where in each building system the insulation was placed towards the warm side with a fixed thickness of 5 cm. The simulations concerned: a) the application scenario, b) the type of stratigraphy chosen, (c) the exposure of the existing building system. The outputs generated by the simulations provided the data to determine in which type of building, depending on the insulating materials, interstitial condensation is formed or not. It is shown that only for the climate zones of the cities of Oslo and Brussels, associated with their building typologies, for the insulating materials: mineral and natural, there is the formation of interstitial condensation