3-layer, reinforced, water-permeable, vapour permeable foil The blue color of the label and the printing indicate that the foil is applied on the outside (the cold side) The inner structure is protected against moisture influences from outside, such as rain and drifting snow, and water vapour can be ventilated from inside This foil is used as a basket-bearing, vapour permeable, water-permeable foil in pitched roofs >25 degrees and facades