EPDM Roofing

The Original Rubber Roof

EPDM (Ethylene Propylene Diene Monomer) is a durable synthetic rubber membrane used on flat and low-slope roofs, available in large sheets that can cover wide areas with minimal seams. EPDM has been a standard flat roofing material for decades, valued for its flexibility, weather resistance, and proven long-term performance. The black rubber surface is immediately recognizable and distinguishes EPDM from the white TPO membranes that have become more common in recent years.

Insurance claims on EPDM roofs require specific knowledge of how the material is installed and how it fails.

EPDM Damage and Failure Modes

EPDM damage typically appears as punctures, tears, seam tape failure, membrane shrinkage, or surface crazing (fine surface cracks from UV exposure on older membranes). Wind damage can lift EPDM at edges and corners, particularly on mechanically attached or ballasted systems where fasteners or ballast have shifted. Hail damage is harder to document on EPDM than on rigid surfaces because the rubber absorbs impact without showing obvious dents. Look for bruising, weakened areas, or embedded gravel from ballasted systems.

Seam failures are a common source of leaks on EPDM roofs. The adhesive or tape used to join membrane sheets can degrade over time, creating entry points for water.

EPDM in Xactimate

Xactimate prices EPDM by the square under the RFG category, with separate line items for membrane removal, installation, seam repair, and flashing. EPDM comes in different thicknesses (45 mil and 60 mil) and the estimate must specify the correct gauge. Installation method (fully adhered, mechanically attached, or ballasted) also affects pricing. Patch repairs on EPDM use specific adhesive and primer products that should be included as separate line items.