Evansville grew up around manufacturing, from plastics packaging to the stamping plants that feed the Toyota assembly line up in Princeton. A plant roof has to hold up over a building that never really stops moving underneath it.
A distribution warehouse roof mostly deals with weather. A manufacturing roof deals with weather plus everything the process throws at it from underneath: heat rising off extruders and injection molds, grease and particulate from machining lines, and vibration that works fasteners loose over time. We've walked plastics packaging roofs in Evansville where the membrane near the process exhaust was noticeably softer than the field membrane thirty feet away, just from years of low-grade heat exposure.
Along the US-41 corridor north of town, the supplier plants that feed the Toyota assembly operation in Gibson County run tight production windows. Their roofs carry the same load as any industrial building, but the tolerance for downtime during a repair is close to zero. We plan around that instead of around our own convenience.
Most single-story plant buildings in this market are low-slope, and TPO is the material we reach for first on a re-roof. It welds clean, handles the reflectivity that keeps a plant's cooling load down through an Ohio Valley summer, and it's easy to patch around new equipment curbs when a line changes. On older plants with standing seam over the original bar joist structure, we'll often recover with a screw-down or clip system rather than tear the whole roof off, as long as the deck and purlins test out sound.
Where a plant has heavy roof traffic from maintenance crews servicing rooftop units, we'll spec walk pads along the service routes at install. It costs a little more up front and it's the single easiest way to keep a membrane from getting worn through in the first three years.
A plant roof rarely stays the same as the day it was installed. Lines get added, exhaust fans get relocated, a new dust collector goes in over the west bay. Every one of those changes means a new curb, a new pipe boot, or a new flashing detail cut into a membrane that was never designed for it.
We keep a rooftop as-built for clients with active production floors specifically so the next penetration gets flashed correctly instead of caulked and hoped for. Caulk is not a roof detail, and on a working plant it fails fast because the deck below it is usually warmer than ambient.
Plant safety offices in this market run permit systems for hot work, confined space, and lockout, and roofing crews have to work inside those systems, not around them. We coordinate torch-applied modified bitumen work and any open-flame detail work directly with a plant's EHS staff before crews show up, because a shutdown for a missed permit costs everyone more than the extra day of coordination up front.
Second and third shift plants change the math on us too. We'll stage material and set up in daylight, then run the noisy demo work during whatever window production actually goes quiet, even if that's a Sunday morning instead of a weekday.
Ohio Valley winters bring freeze-thaw cycling that works on any cracked flashing joint, expanding water in a hairline gap until it's not hairline anymore. Combine that with the low-grade process heat rising off a plant floor and you get condensation forming on the underside of insulation in ways a purely weather-driven roof doesn't see. We check for that condensation risk specifically on plant roofs with high-humidity processes, since it can rot a deck from underneath before anything shows on the membrane surface.
Summer swings the other way, with heat and humidity pushing membrane expansion and softening some older modified bitumen systems enough that foot traffic denting becomes a real issue. We factor both ends of that swing into material choice rather than speccing a roof that only performs well in one season.
In most cases yes, section by section. We'll phase the work so only the area under active repair is opened up, and we close it in before leaving it exposed overnight in anything but settled weather.
We do. Any crew running a torch or doing cutting work on your roof gets scheduled through your EHS office the same way your own maintenance staff would be, and we carry the fire watch equipment that goes with it.
We flash new curbs to match the existing system rather than field-caulking around them, and we'll update your roof as-built so the next contractor, whether it's us or someone else, knows what's under the membrane.
Foot traffic without walk pads, usually near HVAC and dust collection units that maintenance techs service weekly. The membrane wears thin at those spots years before the rest of the roof shows any age.
Yes, though it's often a different roof system than the production floor. We'll evaluate both areas separately since the office wing rarely sees the same heat and vibration load as the plant side.