EPDM roofing membranes are known for their durability and weather resistance, but ensuring they perform well begins with proper underlayment. Underlayment is a material layer installed between the roof deck and the EPDM membrane, helping protect the roof deck from moisture and providing a smooth surface for the membrane to adhere to. Typically, a special cover board or slip sheet is used as underlayment with EPDM. The underlayment prevents damage from debris or rough surfaces, controls moisture, and can help with insulation. Homeowners might notice curling edges or bubbles in the EPDM membrane if the underlayment is missing or improperly installed. A simple DIY check involves carefully inspecting the edges and seams of the membrane for signs of separation or wrinkling and ensuring no debris got stuck underneath during installation.
If you see any issues like loosened seams or water pooling on your EPDM roof, it's time to call a professional roofer familiar with rubber roofing systems. When speaking with a contractor, ask if they will use an approved underlayment compatible with EPDM membranes to protect your roof deck and maintain your warranty. You can also inquire about their method for ensuring a smooth and clean substrate before membrane application, as this greatly impacts longevity. Because warranties often require specific underlayment and installation standards, confirming the roofer’s adherence to manufacturer guidelines helps protect your investment in the long run.