Roofing materials that look similar may need different repair products. EPDM is a synthetic rubber; TPO is a thermoplastic membrane; modified bitumen is an asphalt-based system. Appearance helps narrow the choices, but records or manufacturer identification are better confirmation.

What to check first

  • Look for documentation and labels.
  • Inspect surface texture and seam construction.
  • Do not identify a roof from color alone.

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, TPO, and Modified Bitumen: Know Your Roof · example 1Opens on YouTube ↗Watch EPDM, TPO, and Modified Bitumen: Know Your Roof · example 2Opens on YouTube ↗

From the project archive

The embedded ceramic coating on the Modified Bitumen Rubber membrane is for protection against ultraviolets
Historical project photo · Flat Roof Doctor
This is a Two Ply Modified Bitumen Rubber
Historical project photo · Flat Roof Doctor
Torch Down Rubber membrane is tougher than all other roofing materials
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.