EPDM (ethylene propylene diene monomer) roofing is a popular single-ply rubber membrane known for its durability and water resistance on low-slope roofs. Ice and water shield is a self-adhering underlayment typically made of rubberized asphalt that's designed to protect vulnerable areas from water intrusion caused by ice dams and wind-driven rain. While traditional ice and water shield is often associated with asphalt shingle roofs, it can also be used under EPDM membranes, especially in critical zones like roof edges, valleys, penetrations, and around gutters where ice dams may form. Its purpose is to add an extra layer of protection, preventing water from seeping beneath the EPDM membrane and causing costly leaks or damage. The shield helps prevent moisture infiltration during freeze-thaw cycles, which is particularly important in colder climates.
For a safe DIY check, homeowners can inspect areas prone to ice dam formation during winter, looking for signs of water backup or any membrane wrinkles or tears near edges and penetrations. Inside the attic, check for dark stains or damp insulation that could indicate water intrusion. While EPDM itself is quite waterproof, compromised sections where the ice and water shield might be missing or improperly installed are more vulnerable. If you notice these signs or if your roof is aging, calling a professional roofer experienced with EPDM systems is appropriate. When you contact a contractor, ask specifically if their ice and water shield product is compatible with EPDM membranes and if they follow manufacturer guidelines to maintain your roof warranty. Also, inquire about their recommended thickness and placement of the underlayment to ensure maximum protection in your climate.