Waterproofing polypropylene roofing membrane which is placed underneath the tile-bearing laths. Is particularly durable without danger of tearing and allows the sure footing during its installation. Provides complete waterproofing, possesses exceptional vapour-permeability and great mechanical strength and it is easily laid due to its light weight (approx. 14 kg/roll). It is ideal for application in non-ventilated roofs with or without sheathing.