Polyurethane roof coatings are popular for extending a roof’s life by providing a seamless, durable layer that resists water and UV damage. However, leaks around chimney flashing can still occur due to a few common causes. Often, flashing leaks happen because the polyurethane coating cracks, peels, or deteriorates near chimney junctions where movement, temperature changes, or improper installation create weak spots. The flashing itself might also be poorly sealed or damaged, allowing water to seep in. To check if this is the issue, look for visible cracks, blisters, or gaps in the coating around the chimney, and monitor any water stains or dampness inside the attic near the chimney area. You can safely perform a visual inspection after a dry spell, using binoculars or carefully examining from a ladder if you’re comfortable; avoid walking on the coating if it’s not designed to be walked on.
If you discover signs of damage or suspect a leak, it’s wise to call a professional roofer experienced with polyurethane coatings and flashing repairs. They can determine if re-coating, re-sealing the flashing with compatible materials, or replacing flashing sections is necessary to restore a watertight seal while preserving your roof warranty. When consulting a contractor, ask specifically whether their repair methods will maintain the integrity of your polyurethane coating without voiding the warranty, and how they will ensure long-term adhesion and flexibility at the chimney flashing areas. These questions help confirm the roofer’s expertise with both the coating system and flashing details critical to keeping your roof dry and protected over time.