Diffusion-open roof membrane with very high mechanical strength. The product with the highest resistance to weather conditions and damage during installation, fully universal. For use in all types of buildings. It can be laid on formwork as well as without formwork. High mechanical resistance combined with an extremely durable, reinforced functional layer with a thickness of 220 μm - these are unique features within a product with such a low diffusion resistance (SD = 0.02 m). Thanks to this, it provides a unique combination of tightness and water vapor control. Also available with integrated adhesive tape. Color: white from below, gray from the outside.