5 Steps to Repairing a Patch of Damaged EPDM Roofing Membrane?

EPDM membranes are comprised of synthetic rubber and are a popular contender for commercial roofing systems in Oklahoma. It is not compatible with asphalt-based products, including roof cement flashing and aluminum coatings. If you use these materials along with your EPDM roofing, the rubber will end up getting contaminated, leading to further damage and expensive repair.

Repair Kit for EPDM Roofing Membrane

Tools -

  • Shears and Utility Knife

  • Paint Roller

  • Steel Roller

  • Tape Measure

Materials -

  • EPDM Patch

  • EPDM Primer

  • All-purpose cleaning agent

  • Discarded Rags

  • Lap Sealant

  • An old credit card or similar plastic tool

Instructions to Repair

#1 Prepare the Surface

The process of repairing an EPDM roofing membrane begins with prepping the surface of the roof that will receive the patch. EPDM sheets contain carbon that often develops a film upon exposure to air. The carbon film along with other forms of dirt and oxidation is to be scraped clean from the roofing surface before the repair patch is stuck to it.

Commercial roofing experts recommend using an all-purpose cleaner that doesn’t leave a residue. Wash the area with damage and clean thoroughly. Liberally scrub using cloth rags to remove all traces of oxidation and moisture.

#2 Measure and Cut the Patch

The next part requires you to whip out the tape measure and utility shears. Measure the patch area and cut out a piece of the EPDM sheet such that at least 2 inches of material is left over (along the length and breadth) after covering the patch. Clip the corners to create rounded edges that do not snag.

#3 Prime the Damaged Area

Once you are done with the measuring and cutting, you will need to apply a thin but even layer of EPDM roofing primer to the surface where the patch is to be applied. We suggest using paint rollers for suitable coverage, but if you do not have one, you can also use a regular paintbrush. Take extra care to make sure that you do not miss any spots. Also, paint well beyond the edges of the patch for the sheet to secure snugly.

#4 Install the Repair Patch

There are two kinds of repair patches commonly used in commercial roofing.

  • Pressure-sensitive patches -

Pressure-sensitive patches have a film backing that needs to be removed before pressing it down over the repair area. Get hold of a steel roller and run it over the patch to eliminate any rogue air pockets. The rolling motion will also help firmly bond the patch.

  • Glue-down patches -

Working with a glue-down patch, you will need to apply a single-ply EPDM adhesive on the hind side of the patch and the roof surface. Let the adhesive dry until it is no longer tacky to touch. Once you are satisfied with the consistency, press the patch onto the roof. Roll over the patch with a steel roller to get rid of air bubbles.

Important Note - The adhesive used for glue-down patches should be strictly made to bond EPDM to EPDM. Do not mistake it for yellow glue, used to seal EPDM to other substrates and insulation boards.

#5 Seal the Edges

The closing step in the process is to seal the edges of the EPDM roofing patch. Squeeze a heavy glob of EPDM lap sealant along the perimeter. Smoothen and flatten the sealant using an old credit card or a plastic tool. Ensure that the sealant covers the edges and blends effortlessly into the surrounding roof surface.

Roofers You Can Trust Always to Do the Best Job

Business owners have a lot to worry about; commercial roofing repairs don’t have to be one of them. Elliott Roofing has a full-service team that prides itself on its extraordinary workmanship and thorough experience dealing with EPDM roofing membrane repairs, among others. Our patrons in Oklahoma City can contact us for a free estimate via our website!