3 Common Problems & Solutions of Single-Ply Membrane Roofing

Single-ply membranes (TPO and EPDM) dominate commercial roofing but have predictable failure modes. Here are the three most common problems and how to address them.

Problem 1: Seam Failure

The most common single-ply problem. TPO seams are heat-welded; EPDM seams use adhesive tape. Both fail over time from thermal cycling, UV exposure, and aging. Seam failure creates direct water entry points. Individual seam repair is temporary when the membrane is aging — new failures emerge near repaired areas. Best solution for widespread seam failure on aging membranes: silicone coating restoration, which seals all seams simultaneously under a new manufacturer warranty.

Problem 2: Flashing Failure

Flashings at penetrations, parapets, and walls are the second most common failure point. Traditional metal and membrane-based flashings are particularly vulnerable at corners and transitions. Prevention: annual inspection and proactive re-sealing. Solution: silicone coating with reinforced fabric at all flashing transitions provides a durable, flexible repair.

Problem 3: Membrane Shrinkage

EPDM membranes can shrink over time, particularly when installed adhered (not ballasted). Shrinkage pulls flashings away from walls and parapets, creating gaps. Signs: separation at wall/parapet terminations, horizontal wrinkles across the field. Solution: re-secure and reflash terminations. If widespread shrinkage, coating restoration may be needed to stabilize the system.