Flat EPDM Roof Leak Repaired and Sealed Right

Flat roofs are great until they leak. And when they do, the problem is almost never in an obvious spot. Water finds the smallest gap - around a skylight frame, along a seam, at any point where the membrane meets another surface - and it works its way in quietly. By the time you notice water inside, it's usually been sitting somewhere it shouldn't for a while.

That's exactly the kind of situation we dealt with here. The leak was traced to the area around a rooftop skylight, where the EPDM membrane had started to fail at the transition point. Water was pooling right at the edge of the frame, which is one of the most common failure spots on a flat roof. That junction between the membrane and a penetration like a skylight takes a beating over time, and if it isn't sealed correctly, it gives water a direct path in.

EPDM is a durable material, but it's only as good as the sealing work around it. We focused on getting the problem area cleaned up, properly prepped, and sealed so it would hold - not just look patched. With flat roofs, a sloppy fix almost always comes back. The goal is to get it right the first time so the repair actually lasts.

Flat roof repairs like this are often more straightforward than people expect, but the key is catching them early. A small leak left alone can mean saturated insulation, damaged decking, and interior water damage - costs that add up fast. If you've seen any sign of water getting in, that's the time to get someone up there, not after the next heavy rain.