Shrinkage is most common on EPDM or modified bitumen roofs. … The primary concern with a roof that is shrinking is the way it pulls the flashings at curbs, penetrations, and walls; this often leads to splits and cracks that allow moisture in, which can result in leaks.

Does EPDM rubber shrink?

Despite its durability compared to other rubbers, EPDM naturally shrinks over time—several factors can speed up EPDM shrinkage. EPDM is a commonly used because it is capable of protecting more vulnerable roofing materials.

What are common problems with EPDM roofs?

Three most common problems with Rubber Roofs is improper installation, shrinkage and the seams. While the rubber roofs are known to be durable, they also need maintained. EPDM roofs are fully adhered or as many call it glued down. The system is not attached mechanically.