Roof Recover and Overlay for commercial buildings across Louisville.
Roof Recover and Overlay for commercial buildings across Louisville.
TPO (thermoplastic polyolefin) is the workhorse single-ply membrane for Louisville commercial flat roofs. It reflects summer heat, welds reliably with hot-air seam tools, handles UV exposure through long Kentucky summers, and carries 20-year manufacturer NDL warranty paths from every major manufacturer — GAF, Carlisle, Manufacturer Warranty Coordination, Sika Sarnafil, Versico, Firestone.
Louisville's climate demands attention to two details that milder markets can under-spec: seam weld integrity through wide temperature swings (the Ohio Valley routinely sees 100-degree spreads between winter lows and summer highs), and flashing termination at parapet walls that takes ice-load movement into account. A TPO lap that welds correctly in July needs to hold through a February ice storm — we design the seam schedule and the flashing details accordingly.
We install TPO mechanically attached, fully adhered, or in recover configurations depending on building use, wind exposure, deck condition, and the manufacturer's design package. Most Louisville commercial TPO work is mechanically attached on tapered ISO over metal deck — the configuration that handles the region's wind exposure and freeze-thaw cycling at the lowest installed cost per square.
60-mil TPO is the standard specification for Louisville commercial buildings — adequate for most warehouse, retail, and office buildings with normal foot traffic and standard rooftop HVAC equipment. Carries a 20-year manufacturer NDL warranty from every major manufacturer, and performs well in Louisville's temperature envelope when installed over a proper insulation stack.
80-mil TPO costs more per square but provides a longer warranty path (up to 25 years from some manufacturers), higher puncture resistance for buildings with frequent rooftop traffic, and better performance at parapet flashings in buildings with narrow parapets subject to ice loading. We spec 80-mil for buildings with heavy rooftop equipment, high maintenance-traffic environments, or owners who want the longer warranty term and the lower lifecycle cost it implies.
Mechanically attached: Most common in Louisville commercial work. Membrane fastened with screws and plates through insulation into the deck on a pattern designed against the building's wind-uplift requirement per IBC 2021. Faster installation and lower cost than fully adhered; appropriate for most Jefferson County commercial buildings.
Fully adhered: Membrane bonded to the substrate with a TPO-compatible adhesive. Used when the deck cannot tolerate additional penetrations, when wind-uplift requirements exceed mechanical attachment capacity, or when the building owner wants a cleaner aesthetic with no fastener telegraphing. Also used for recover applications over existing smooth-surface substrates.
Recover over existing membrane: When the existing roof is single-ply or smooth BUR with dry insulation, a TPO recover avoids full tear-off cost. We verify insulation dryness with core pulls before recommending recover — wet insulation under a new recover voids the warranty and accelerates decay.
Drain design: Louisville gets meaningful rainfall events — flash flood watches on the Ohio River tributaries are a regular summer occurrence. We verify drain capacity, drain slope, and sump condition before any TPO installation. Undersized drains on a new TPO roof fail within two seasons.
Parapet flashing termination: Ice storm loading — Louisville gets one or two significant ice events per decade — can move parapet walls relative to the roof deck. We design flashing termination with movement capacity, not just weather resistance.
UPS Worldport context: The Worldport complex near SDF is one of the largest single-story roofed structures in the world. Its size and operational demands have shaped how Louisville contractors approach large-footprint TPO projects. We design production sequencing and daily dry-in for large-footprint buildings the way Worldport-scale projects require — section by section, with no exposed overnight open.
Yes, when properly installed. TPO is flexible enough to handle the movement that freeze-thaw cycling creates at seams and flashings, provided the seam welds are made at the right temperature and the flashing termination is designed for movement. The failure point is not the membrane — it is parapet flashings that were terminated without accounting for ice-load wall movement. We design those details specifically for Louisville's exposure.
A properly installed 60-mil mechanically attached TPO system with regular maintenance runs 20-25 years in Louisville's climate. The manufacturer warranty is the floor, not the ceiling — well-maintained systems routinely outlast the warranty period. The most common cause of early failure is neglected drain maintenance and deferred flashing repair after ice events, not membrane failure.
For most Louisville commercial buildings, either system works. EPDM tends to handle temperature extremes slightly better in wide-swing climates and performs well in cold applications. TPO reflects heat better (relevant for summer energy costs in uninsulated or minimally insulated buildings) and is easier to weld repairs cleanly in the field. We give a system recommendation after the roof walk — it depends on the building's use, existing deck conditions, and your capital horizon.
Tell us about the building and the roof problem. We'll document it and put a plan in writing — no pressure, no boilerplate.
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