TPO Roofing - Installation, Recover, and Warranty

TPO is the most-installed commercial single-ply membrane in Atlanta commercial work. We install 60-mil and 80-mil systems against manufacturer-spec details with 20-year no-dollar-limit warranty paths that survive Atlanta's humidity, heat, and storm cycle.

TPO - thermoplastic polyolefin - is the dominant single-ply membrane for Atlanta commercial flat roofs installed after 2005. It reflects solar heat (critical in Atlanta's urban heat island), hot-air welds reliably across the humidity range Atlanta sees from spring through fall, holds up against UV degradation better than older PVC formulations from the 1980s and 1990s, and carries 20-year NDL manufacturer warranty paths from every major manufacturer: GAF EverGuard, Carlisle Sure-Weld, Johns Manville, Sika Sarnafil, Versico, Firestone UltraPly.

Atlanta's climate creates specific requirements for TPO installation that matter to long-term performance. The city's high humidity means membrane surfaces stay damp longer than in drier markets, which affects the timing window for fully adhered installations. The afternoon thunderstorm pattern from April through September creates on-site scheduling pressure - crews cannot leave unseamed membrane exposed to rain. And the Piedmont granite base under the metro creates building movement that shows up as stress at mechanically attached lap joints over time, which is why we spec seam-widths and fastener patterns conservatively against the manufacturer's minimum design requirements.

We install TPO mechanically attached, fully adhered, or in rare cases ballasted, depending on building use, wind exposure, and the manufacturer's design package. Most Atlanta commercial TPO work is mechanically attached on tapered polyiso over metal deck - the configuration that handles the metro's wind exposure and thermal cycling at the lowest installed cost per square. Fully adhered is specified where the deck cannot accept additional penetrations, where the building owner requires maximum wind resistance above what mechanical attachment can deliver, or where aesthetics matter and the owner does not want fastener shadowing visible through the membrane.

60-mil TPO is the standard specification for Atlanta commercial buildings - adequate for most warehouse, office, retail, and light-industrial buildings with normal foot traffic and standard rooftop mechanical equipment. Every major manufacturer carries a 20-year NDL warranty for 60-mil systems installed to spec. Most of the Perimeter Center, Sandy Springs, and Cobb Galleria office reroof cycle running right now is going in at 60-mil.

80-mil TPO costs approximately 15 to 20 percent more per square installed but extends warranty life with some manufacturers to 25 years, handles higher mechanical-traffic environments, and provides additional puncture resistance in buildings with frequent maintenance foot traffic to rooftop equipment. We specify 80-mil for buildings with heavy rooftop HVAC inventories requiring regular filter changes and belt replacements, for buildings with solar arrays where foot traffic is ongoing, and for owners who want the longest warranty term and are optimizing for lowest 30-year lifecycle cost rather than lowest first cost.

Mechanically attached: Most common in Atlanta. Membrane fastened with screws and plates through the membrane and insulation into the deck on a pattern designed against the building's wind-uplift requirement per IBC 2021. For most Atlanta suburban commercial buildings in Exposure B, this means 12-inch field-fastener spacing and 6-inch perimeter spacing, with corner zones at 4-inch spacing. Tall buildings or those near Hartsfield-Jackson's open exposure get the perimeter and corner zones recalculated against Exposure C or D criteria.