TPO vs EPDM Roofing — Which Is Better for NYC Buildings?

If you're replacing a flat roof in New York City, you'll almost certainly hear about two systems: TPO and EPDM. Both are excellent options, both are widely used across the five boroughs, and both have loyal advocates in the roofing industry. So which one is right for your building?

Here's our honest comparison — based on 17 years of installing both systems across Brooklyn, Queens, Manhattan, the Bronx, and Staten Island.

What Is TPO?

TPO stands for Thermoplastic Polyolefin. It's a single-ply membrane that comes in large rolls and is heat-welded at the seams. The welds create bonds that are actually stronger than the membrane itself — making it one of the most watertight systems available.

TPO is white or light-colored, which makes it highly reflective. In NYC summers, a white TPO roof can reduce rooftop temperatures by 50–80°F compared to a dark surface, cutting cooling costs significantly.

Pros of TPO:

Cons of TPO:

What Is EPDM?

EPDM stands for Ethylene Propylene Diene Monomer — or more simply, rubber roofing. It's been used on commercial and residential flat roofs for over 50 years, making it one of the most proven systems in the industry.

EPDM is typically black (though white versions exist) and is adhered, mechanically fastened, or ballasted with stone. It's extremely durable and handles temperature extremes well.

Pros of EPDM:

Cons of EPDM:

Cost Comparison in NYC

TPO installation: $6–$12 per square foot

EPDM installation: $5–$10 per square foot

EPDM is typically slightly cheaper in materials, but the difference is often offset by TPO's energy savings over time. On a 2,000 sq ft roof, the material cost difference might be $1,000–$3,000 — but a TPO roof can save that in cooling costs within a few summers.

Which Does IronSky Recommend?

For most NYC buildings, we recommend TPO — specifically 60-mil TPO from manufacturers like GAF, Firestone, or Carlisle. Here's why:

NYC summers are brutal and getting hotter. A reflective white roof makes a real difference in building comfort and energy bills. The heat-welded seams give us confidence in long-term performance. And the 20-year warranties now available from top manufacturers are hard to beat.

That said, EPDM remains an excellent choice for buildings where budget is the priority, or where the roof has complex geometry that makes welding difficult.

The honest answer: both systems, installed correctly by an experienced crew, will give you decades of performance. The contractor matters as much as the material.

Get a Free Estimate for Your NYC Flat Roof

IronSky is GAF Certified and Firestone Licensed — two of the top flat roofing manufacturers in the industry. We install both TPO and EPDM and will recommend the right system for your specific building.

Call (929) 994-0907 or visit ironskyroofing.com/free-estimate for a free, no-obligation estimate.