The expansion values of slate and cement mortar are different. I'm afraid the waterproof coating will crack due to the expansion and contraction cycle. It is best to paste EPDM coil with chloroprene rubber, and then brush the surface with waterproof paint, which will have a good effect. Very serious water leakage has been tested and tested in this way. If waterproof coating has been applied, EPDM coiled material can also be attached, but the surface should be coated with waterproof coating. This kind of coiled material has excellent elasticity, and it will be very durable after being protected by waterproof coating, and there will be no problem for 5 to 10 years. ?

The picture shows the balcony roof wrapped with EPDM coiled material, and then the surface is painted with waterproof paint.