Standing water is always a concern. Here, it indicates that the drain is no longer the low point on this roof or that it could be clogged. Inspect the drains at least twice per year.
When a problem surfaces, sleuthing identifies the root cause, which helps you implement a long-lasting solution.
“It’s easy to just call a restoration guy and have him start working on the skin,” says Daniel Lemieux, principal at engineering firm Wiss, Janney, Elstner Associations, Inc. “But it’s very important to investigation and get the right diagnosis before you move to repair. There has been good money thrown at a solution only to have the leaks reappear afterwards.”