TPO Roofing

Surface color and energy. TPO is white as standard (cool-roof, Energy Star qualified, SRI 100+); EPDM is black as standard (white EPDM available but less common). The white surface of TPO reduces commercial cooling load 20-30% versus dark EPDM on the same building — meaningful operational savings over the 25-30 year roof life.

Seam method. TPO seams are heat-welded with a robotic or hand welder, fusing the two sheets into a continuous membrane stronger than the field. EPDM seams use adhesive (cold-applied) or seam tape — strong but ultimately reliant on the bond between the adhesive and the rubber. Heat-welded TPO seams are widely considered the more reliable long-term joint.

Chemical resistance. TPO handles grease, oils, and many chemicals better than EPDM — the right answer for restaurants near rooftop fryer exhausts, industrial buildings, and anywhere chemical exposure is part of the building's use case.

Cost. TPO and EPDM are roughly comparable on new commercial installs. EPDM has a small advantage on simple, well-drained roofs; TPO has the advantage on roofs where reflective surface, chemical exposure, or warranty class matter.

Service life and warranty. Both routinely carry 20-30 year manufacturer warranties on properly installed systems. EPDM has a longer track record (45+ years of field data); TPO has 25+ years on modern formulations. Most NJ commercial flat-roof spec'd new now is TPO.

Membrane thickness. 45 mil is the budget standard; 60 mil is the residential/small-commercial default; 80 mil is the high-traffic / long-warranty class. Thicker membrane resists punctures from foot traffic, hail, and dropped tools — and longer manufacturer warranties typically require thicker membrane.

Smooth-back vs fleece-back. Smooth-back TPO is the standard. Fleece-back TPO has a polyester non-woven fabric laminated to the underside — adheres better to insulation, allows fully-adhered installs without complete deck adhesive coverage, and improves seam strength. Standard upgrade for premium warranty class on GAF EverGuard Extreme and Carlisle Sure-Weld FleeceBACK.

Mechanically fastened. The most common attachment method on large commercial roofs. Membrane is fastened with screws and plates through the seam zone, then the next sheet laps over and is heat-welded. Fast install, lower cost per square. Right when the roof can take fastener loads (most NJ commercial does).

Fully adhered. Membrane is glued to the insulation across the entire field with bonding adhesive. Higher cost, smoother appearance, fewer wind-uplift concerns on tall buildings. Typically required when wind ratings exceed 130 mph (most NJ inland is below that; shore exposures may need it).

Ballasted. Loose-laid membrane held down by river rock or pavers. Less common on TPO than on EPDM — usually only on retrofits or specific architectural situations. We don't typically spec ballasted on new TPO.

Warehouses and distribution centers. Standard spec for new warehouse construction across Northern NJ. Bright white surface meets local cool-roof codes where applicable; mechanical fastening handles tall building wind loads; chemical resistance handles industrial activity.

Retail and shopping center. Plaza ownership groups standardize on TPO for the entire portfolio — easier maintenance (one system across all properties), Energy Star qualifies for utility rebates, white surface complements solar-PV installs which are increasingly common.

Restaurants. The rooftop kitchen exhaust grease wash is the test case where TPO outperforms EPDM. We use 80 mil PVC or PVC-blend TPO at the curb where grease concentrates; standard 60 mil TPO across the rest of the field.

Schools and institutional buildings. NJ school districts have moved heavily to TPO over the last 15 years — reflective surface reduces classroom cooling load, warranty class supports the long capital-replacement cycles institutional buildings need.

Multi-family / mid-rise residential. Increasingly common spec for low-slope sections of multi-family construction. NJ Code R907 considerations apply if installed over existing roof; we coordinate inspector review on every install.