Repairing an Old Leaky Rubber Roof. This EPDM roof is massive and in need of several repairs. Their chief complaints were several roof leaks that we could find the causes of. The first one was due to the edge being sealed by just tape. Unfortunately, that won’t waterproof anything. We will use a coating to seal up the edges and fix the leaks on the edges. A major leak in the middle was caused by the seal break from the two edges of the EPDM rolls. To fix this, we will put tape over the edges and a waterproof sealant.