TechnoNICOL vapor sealing

The vapor barrier layer is a barrier to the penetration of moisture from the inside to the thermal insulation layer of the roofing. Why is it necessary? First, humidity worsens the heat-insulating and mechanical properties of the insulation, and, second, water may condense in the thermal insulation layer, and the accumulated water may enter the premises as droplets. The second point is particularly important for roofs located in areas with low outside temperatures.