EPDM and modified bitumen can both develop leaks at seams and flashing, but they are not interchangeable materials. Compare the actual assembly and its condition instead of assuming a fixed lifespan from the membrane name.

What to check first

  • Use EPDM-compatible repair materials on EPDM.
  • Identify whether modified bitumen is smooth or granulated.
  • Consider installation quality, drainage, maintenance, and moisture history together.

Identify the roof before selecting a product

  1. Use reliable identification

    Look for installation records, membrane markings, or a qualified assessment. Color alone cannot reliably distinguish EPDM, TPO, PVC, or a coated asphalt surface.

  2. Identify any previous coating

    The material a sealant touches may be an old coating rather than the roof membrane. Product compatibility must account for that exposed layer.

  3. Confirm the current repair detail

    Review the manufacturer’s instructions for both the substrate and the type of defect. An installation demonstration is not a substitute for a suitable localized repair method.

Watch the field examples

These archive demonstrations show individual projects. Use the current guidance above and Bergstrom’s published instructions if an older video shows a different product or method. Torch work shown in installation videos is professional work.

Watch EPDM and Torch-Down Roofs: A Repair-Focused ComparisonOpens on YouTube ↗

From the project archive

EPDM Rubber Roofs - see the degraded membrane from ultraviolet rays.
Historical project photo · Flat Roof Doctor
Modified Bitumen Rubber Roofs in Westport CT
Historical project photo · Flat Roof Doctor
Roof detail from the original Flat Roof Doctor project
Historical project photo · Flat Roof Doctor

Product reference: Bergstrom Industries’ published knowledge catalog. Follow the latest product label and safety information. Historical project examples are educational and are not a specification for every roof.