TPO has become the default answer for a lot of low-slope roofs, and often it's a good one: a single-ply membrane with heat-welded seams that, done properly, behave like one continuous sheet. Whether it's the right answer for your building depends on the assembly underneath it and the quality of the details, which is where this page spends its time.
A TPO roof isn't a sheet of white plastic; it's a stack. Insulation over the deck sets the roof's thermal performance and its slope-to-drain. An attachment method, mechanically fastened, adhered or ballasted, holds the assembly against wind. The membrane goes over that, and then the details, the flashings at every edge, curb and penetration, finish the system. Most of what separates a good TPO roof from a mediocre one is decided below and around the membrane, not by the membrane brand.
Worth saying plainly: white and smooth doesn't mean TPO. PVC and coated roofs read the same from a distance, and they take different repair materials. Any real proposal starts by confirming what's actually on the roof.
TPO's signature strength is the heat-welded seam: membrane fused to membrane, not glued. That strength has conditions attached.
A proper weld requires prepared surfaces and membrane that's still weldable. Dirt, weathering and age all degrade weld quality, which is why seam work on an older roof starts with testing how the material takes a weld, not with assuming it will.
Every pipe, curb, drain and corner gets its own formed flashing. These details are where installation quality shows, and where inspections concentrate later, because a perfect field with rushed details still leaks.
The perimeter is where wind works hardest on a single-ply roof. Edge metal and termination details sized and fastened for the building, not generically, are what keep a storm from finding a starting point.
Confirm the existing system, survey for moisture, and check how the membrane and substrate have actually held up.
Insulation, slope-to-drain and attachment method chosen for the building and its wind exposure, with drainage problems corrected on paper before they're corrected on the roof.
Flashings, edges and penetrations executed to the system's requirements, with seams checked as the work closes out.
Usually, if the membrane still takes a weld. Seam repairs on TPO are welded, not caulked, and their quality depends on the material's condition and the preparation, so an assessment tests weldability rather than assuming it from the roof's age in either direction. The flat roof repair page covers how seam leaks get traced in the first place.
Some qualify. Aged TPO can accept restoration coatings, but only after a moisture survey, adhesion testing and full preparation, including replacing any wet materials first. Product systems for aged TPO make those checks explicit requirements, not suggestions. The roof coatings page walks through qualification.
No fixed number is honest. A reflective roof reduces the heat the building absorbs in summer, and what that's worth depends on your climate, insulation, equipment and how the building runs. What you can act on is the assembly design: the insulation layer is the part of the energy story you actually control.
Repair, recover or rebuild is a decision worth making on evidence. A free assessment establishes what's on your roof, where the moisture is, and which of the three paths your building has actually earned.
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