This particular vapor barrier type is composed of four layers (PP, ALU, TL, and PP) and is ideal for use on roofs lacking ventilation systems. Its robust resistance to tearing and stretching makes it a suitable choice for roofs with high moisture concentrations such as those found in swimming pools, restaurants, and canteens. Maintaining a healthy and fresh indoor climate is therefore crucial. When using this type of vapor barrier, it is important to select the appropriate size of insulating material so that even under harsh temperature and humidity conditions, the dew point remains outside the vapor barrier. Inadequate thermal insulation may cause condensation inside the vapor barrier, leading to leakage into the room.
