When we removed loose membrane and cleared the drain area we saw that the area was wet, which confirmed our suspicions that it was leaking. Once the area was cleaned up we applied Bakor primer on the metal surface area of the drain to help the new rubber membrane stick once it is torched. We then applied a SBS 250 cap membrane over the area and finished off by applying Bakor plastic cement around the drain. Since it rained the next day we called our client to find out whether he was still getting a leak. As expected the drain area was the cause of the leak and our client was thrilled that it was no longer leaking.
