TPO vs. EPDM vs. Metal: Choosing a Flat Roof

Quick Comparison

TPO — The All-Around Winner for Most Buildings

Thermoplastic Polyolefin is the most-installed commercial membrane in North America, and for good reason. Its white reflective surface keeps the roof cool (cutting HVAC costs), its heat-welded seams are stronger than the membrane itself, and it hits a sweet spot of cost, performance, and longevity. For the typical Toledo warehouse, office, or retail building, TPO is our default recommendation. More on TPO →

Choose TPO if: you want the best balance of cost, energy efficiency, and durability — which is most commercial buildings.

EPDM — The Budget-Friendly Proven Performer

EPDM rubber has been protecting commercial buildings since the 1960s. It's the lowest-cost quality membrane, it stays flexible in extreme cold (a real advantage in Ohio winters), and it's simple to repair. The downside is its black surface, which absorbs heat and raises summer cooling costs — though white EPDM is available at a premium. More on EPDM →

Choose EPDM if: upfront budget is your primary constraint and you want a proven, no-frills membrane.

Metal — Maximum Longevity at a Premium

Standing-seam metal roofing lasts 40–70 years — far longer than any single-ply membrane — and carries the highest insurance ratings for fire and wind. The trade-offs are cost (roughly double TPO) and slope: true flat roofs can't shed water properly with metal, so it's best on low-to-steep slopes rather than dead-flat commercial roofs. For a flat warehouse roof, metal usually isn't the right call; for a low-slope building where you want to install once and never think about it again, it can be.

Choose metal if: you have adequate slope, plan to own the building for decades, and want the longest-lasting option regardless of upfront cost.

The Bottom Line for Ohio Buildings

For the vast majority of flat and low-slope commercial roofs in Northwest Ohio, the real decision is TPO vs. EPDM — and TPO wins for most buildings on total 25-year cost once you factor in energy savings. Metal is a specialty choice for sloped applications. The right answer always depends on your specific building, budget, and how long you plan to own it. See full Ohio cost breakdown →