TPO roof installation, repair and replacement for McKinney, TX commercial buildings, with seam testing, attachment review and weather-window planning.
Tell us about the building and what you are seeing. We reply with the next practical step.
A TPO roof that leaks rarely leaks in the field of the sheet. Water finds a probe-tested seam that was never fully fused, a corner where the membrane was stretched tight, or a pipe boot that has shrunk away from its pipe. The first check on any McKinney TPO roof is therefore a walk along the welds and the details, because that walk decides whether the call is a contained repair or the start of a larger scope.
We install, repair and replace thermoplastic polyolefin roofs on commercial buildings in McKinney, TX, including office and industrial parks and retail buildings near US 75, SH 121 and US 380. Where the water appeared, how the building is staffed and how a crew reaches the roof tell us how to schedule the inspection.
TPO is a single-ply sheet made from a blend of polypropylene and ethylene-propylene rubber, usually with a polyester scrim for strength. It is typically white or light gray, which reflects sunlight. Seams are joined by hot-air welding, which fuses the two sheets into one continuous layer. That is the strength of the system and its main risk: a weld is only as good as the speed, the heat and the cleanliness of the surface when it was made.
The sheet is attached in one of three ways. A mechanically attached roof is fastened through the sheet or at the seam into the deck. A fully adhered roof is bonded to the cover board or insulation. A ballasted roof is held down by stone. Each choice changes wind resistance, repair method and what we look for during an inspection, so the first record we make is which attachment the roof actually has.
Open welds show as a dark line or a lifted edge along a lap. Probing with a blunt tool finds seams that have not yet opened. At walls, curbs and penetrations, the flashing is often a separate piece of membrane or a pre-molded boot, and these details fail before the field does. Shrinkage can pull the sheet away from a parapet, and a mechanically attached sheet can billow and wear against its fasteners over years.
On older TPO, surface crazing and chalking show aging. Dirt buildup and standing water speed it. A pond over a seam is a particular concern because the seam is the weakest line in the sheet. We photograph each finding against a numbered work zone, then separate what can be welded and patched from what points to wet insulation or a failed attachment.
Chemical exposure is a second path to early failure. Grease from kitchen exhaust, oils from mechanical equipment and some sealants can soften a thermoplastic sheet. We note every vent and discharge point, check the membrane around it for staining or swelling, and plan a protective pad, a different membrane or a relocated discharge where the exposure is regular.
In the Dallas-Fort Worth normals, July afternoons average 95.6°F and August afternoons 95.8°F. Heat softens a membrane, which makes it easy to scuff and slower to weld cleanly, so summer work starts early and stops when the surface is too hot to handle. Those are regional normals and not a reading from any one McKinney roof.
Spring is the Metroplex's severe-weather peak according to the Weather Service, and large hail, damaging wind, flooding and tornadoes strike somewhere in the region almost every year. A regional event does not prove damage at a given property. After a storm, we check TPO for bruising, punctures at fastener plates and displaced flashing, and we look at the insulation under any impact. A thicker, reinforced sheet over a firm cover board takes impact better than a thin sheet over soft insulation. The hail damage repair record separates storm marks from earlier wear.
A contained repair is possible when the defects are local and the insulation tests dry. We clean the surface, weld a patch or new flashing with a probed edge, and record the location. Where a TPO roof is sound but has an old, failing flashing system, flashing replacement can extend the field. When the sheet is brittle across large areas or the insulation is wet, the roof moves toward a roof recover or a full commercial roof replacement.
A new TPO assembly is chosen for the building, not the catalog. In a region where hail is a recurring spring risk, a firm cover board under the sheet spreads impact that soft insulation would crush. Insulation thickness, cover board and attachment pattern respond to the energy code and the wind exposure. The 2024 building and energy codes McKinney adopted carry local amendments, and the ones that apply are confirmed for each permit. We flag any insulation or reflectance item early so the tear-off limit and the scope match the approval path.
Office and industrial parks sit throughout McKinney beside its retail development districts, from the US 75 and SH 121 district to Historic Downtown, so the commercial stock covers several roof uses and operating schedules. A TPO tear-off over an occupied shift needs a lift plan, a staging area and a defined work zone. We agree on dock routes, parking limits and the hours when loud work is allowed. Property-level truck access and roof access must be confirmed for each site.
Weather holds are part of the sequence. We open only the area that can be dried in the same day, check drain paths before cutting, and seal tie-ins at every stop. A spring storm can interrupt an open section, so temporary protection stays ready on the roof.
Foot traffic matters on a TPO roof that carries rooftop units. We map the service route, add walk pads where it crosses a seam or a flashing, and record which units are serviced most often. An unprotected route is a frequent source of scuffs and punctures within a few seasons, and it is cheaper to place pads during the roof project than to repair the sheet afterward.
At the end we leave a record with photographs of each work zone, the attachment pattern, seam probe results, drain checks and the product data for the sheet and flashings. A preventive roof maintenance schedule then tracks the welds and details. Owners comparing systems can set TPO against PVC roofing, which handles grease better, or EPDM, a rubber sheet with a different seam method, using the same roof plan.
Share the leak location, operating hours and access limits. We will inspect the seams and details and sequence the work around the building's workday.
Short answers to what owners and facility managers ask before a roof visit.
Welds depend on heat, speed and a clean surface. A weld that looked fine at installation can hold marginal fusion, and movement over many hot days opens it first.
Yes, for small repairs. We set a work zone, keep traffic away from the lift and weld in short sections so the roof is closed again before the crew leaves.
No. Damage depends on stone size, sheet thickness and the substrate under it. We test the insulation under any impact before calling it a repair or a claim item.
It lowers surface temperature and can reduce cooling load, but it still needs cleaning and seam inspection. The benefit depends on insulation, roof use and the energy code that applies.
Keep the attachment layout, seam probe results, product data and photographs by zone. They let a later inspection compare the roof against its starting condition.
Send a question about the building and we will reply. Or call 555-555-5555.
