The best EPDM membrane thickness depends on the specific application, but industry professionals generally recommend 60-mil thickness as the ideal balance of cost, durability, and puncture resistance for most commercial and residential flat roofs. While 45-mil EPDM is available and serves as a budget-friendly option for smaller outbuildings, sheds, or low-traffic residential roofs, it is more vulnerable to hail, foot traffic, and sharp debris. For maximum longevity, heavy commercial applications, or roofs subject to frequent maintenance traffic, upgrading to a robust 90-mil thickness provides superior tear strength, enhanced puncture defense, and extended long-term environmental weather resistance.
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