Asphalt saturated organic felt surfaced with mineral granules. The roll size is 1mx20m, weight 2kg/sqm.
Double Sand Waterproof Cushion (roofing felt) is made of organic felt as the mat, saturated with SBS modified bitumen on both sides, and then coated with mineral schist on upper surface and fine sand on the undersurface.
This product is used under roof shingles for waterproof purpose. It has high tensile strength (compound felt) and good flexibility (saturated bitumen) with long service life. Also, the mineral schist functions for anti-aging, anti-oxidation and corrosion resistance.