How to Repair an EPDM Rubber Roof: What's Involved

EPDM rubber roofing is highly resistant to damage, but physical impact, movement at joins, and flashing failures can all cause problems. Here's what a professional EPDM repair looks like and why the materials used matter.

Types of EPDM Repair

• Patch repair: a section of EPDM membrane bonded over a damaged area
• Seam repair: re-bonding or reinforcing a failed seam join
• Flashing repair: re-dressing a flashing at a wall upstand or penetration
• Trim repair: re-sealing at the perimeter drip trim

Why Materials Compatibility Matters

EPDM repairs must use EPDM-compatible adhesives and patch material. Applying bitumen-based products to EPDM is a very common mistake that causes further damage. EPDM solvents and bitumen are incompatible — applying the wrong product can cause the EPDM to swell and delaminate.

The Repair Process

A proper EPDM patch repair involves: cleaning the area with EPDM primer/cleaner, applying bonding adhesive to both the patch and the substrate, allowing adequate flash-off time, applying the patch carefully to avoid air bubbles, and rolling the repair to ensure full adhesion.

When Repair Isn't Enough

If the membrane shows widespread crazing, multiple tears, or if joins are consistently failing, repair may be a false economy. We'll always assess whether a repair or replacement offers better value, and give you an honest recommendation.