Choosing the Right Storm-Resistant Roofing for Your Commercial Property
If you own or manage a commercial building in the Midwest, you already know that storm resistance isn’t a luxury—it’s a necessity. Between high winds, driving rain, hail, and harsh winters, your roofing system has to perform in every season.
Two of the most common single-ply roofing membranes—EPDM and TPO—each have unique strengths. But when the storms hit, which one holds up better?
Here’s a side-by-side comparison of how EPDM and TPO roofing systems perform in the face of Midwest weather extremes.
1. Wind Resistance
EPDM: Known for its flexibility and ability to expand and contract, EPDM performs well in windy conditions—especially when fully adhered. However, loose-laid and ballasted EPDM systems are more vulnerable to uplift and membrane shifting during high-wind events.
TPO: TPO roofs are typically mechanically fastened or fully adhered, which gives them excellent wind uplift resistance when installed correctly. Because the seams are heat-welded, they’re also less likely to peel or fail under wind pressure.
✅ TPO generally outperforms EPDM in terms of wind resistance—particularly in mechanically fastened systems.
2. Hail and Impact Resistance
EPDM: The rubber membrane is thicker and more pliable than TPO, which allows it to absorb impact well. It tends to resist hail damage better—especially larger hail—because the rubber can flex rather than crack.
TPO: While TPO can resist small to moderate hail, the material is typically thinner and more rigid. This makes it more vulnerable to cracking or punctures under large hail impacts.
✅ EPDM has an edge when it comes to hail resistance, thanks to its flexible, rubberized composition.
3. Freeze/Thaw Durability
EPDM: With excellent elasticity, EPDM performs well in extreme temperature swings. It can expand and contract without cracking, which is key in freeze/thaw cycles common in Missouri and Illinois winters.
TPO: TPO also performs decently in cold weather, but the seams and material can become more brittle in extreme cold, particularly on aging systems or where there are installation flaws.
✅ EPDM is more forgiving in extreme cold and repeated freeze/thaw cycles.
4. Seam Strength and Water Resistance
EPDM: Seams are glued or taped, which can degrade over time—especially under standing water or UV exposure. Water infiltration often occurs at weak seams on aging EPDM roofs.
TPO: TPO seams are heat-welded, creating a fused, watertight bond. This makes TPO less likely to leak at the seams, especially on large commercial buildings where there are many overlaps.
✅ TPO wins in seam strength and waterproofing performance.
So… Which Is Better for Midwest Storms?
There’s no one-size-fits-all answer—but here’s a quick breakdown:
| Category | Winner |
|---|---|
| Wind Resistance | TPO |
| Hail Resistance | EPDM |
| Freeze/Thaw Durability | EPDM |
| Seam Strength | TPO |
Bottom line:
TPO is best for buildings in wind-prone or rain-heavy areas, thanks to its welded seams and uplift resistance.
EPDM is ideal where hail and freeze/thaw cycles are more common, and where flexibility is key.
Need Help Deciding What’s Right for Your Building?
Every roof and facility is different. The best choice depends on your building’s location, layout, and exposure to the elements.
At Jewett Roofing, we’ve installed and serviced both EPDM and TPO systems throughout St. Louis, Greenville, and surrounding areas. We can help you evaluate your options and choose the material that will stand up best to Midwest weather—not just this season, but for the long haul.
Contact us today to schedule a consultation or inspection.
