TPO and EPDM Flat Roof Replacement Chicago

TPO and EPDM are the two most common membrane systems for flat roof replacement in Chicago. Both perform well in the Chicago climate. Our verified contractors install both systems and can help you choose the right option for your building.

TPO (thermoplastic polyolefin) has become the dominant flat roof membrane in Chicago over the past decade. It reflects heat in summer, handles freeze-thaw stress well, and is energy code-compliant. TPO seams are heat-welded, creating a strong monolithic membrane. A TPO system costs $10 to $18 per square foot installed and carries 15 to 20 year manufacturer warranties. EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane that has been used in Chicago since the 1970s. It is more flexible at low temperatures than TPO and is often used on buildings where the simpler installation process matters. EPDM costs slightly less than TPO but typically carries a shorter warranty. Both systems require annual inspection for seam integrity and drain condition. Chicago drainage requirements are strict, and any flat roof replacement must meet current slope and drain specifications.

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