There's a point where patching a commercial roof stops making financial sense. Membrane that's brittle across half the field, insulation that's saturated in three or four spots, flashing that's been re-tarred so many times you can't find the original seam anymore, that's a roof asking to be replaced, not repaired. We walk facility managers through that decision with real numbers, not a sales pitch.
Most of the reroof calls we get in Evansville start with a leak that keeps coming back in the same general area no matter how many times a patch crew has been up there. When we cut a test section and find wet insulation spreading well past the visible leak point, that's usually the signal that repair dollars are being wasted. Ohio Valley humidity works against a compromised roof faster than a drier climate would, moisture that gets under a membrane here doesn't dry out on its own between rain events.
We also look at how the roof was built originally. A lot of the older single-ply and built-up systems around Vanderburgh County are on their second or third recover layer, which limits what a repair can actually fix and adds dead weight the deck wasn't necessarily designed to carry indefinitely. At that point, tearing back to the deck and starting clean is the more honest answer, even though it costs more up front than another round of patching.
Reroofing a plant that runs shifts is a different job than reroofing an empty office building. Berry Global, the Toyota supplier network north of the city, and the smaller manufacturers scattered along the river corridor don't stop production because a roof crew is on site. We build the tear-off and dry-in sequence around shift changes, planned line stoppages, and dock activity so material handling underneath the work area isn't disrupted mid-run.
That usually means working in smaller daily sections than we'd use on a vacant building, with every section dried in and watertight before the crew leaves for the day. We coordinate with plant maintenance on crane placement, staging area location, and which rooftop units have to stay live through the project. On hospital and healthcare campus reroofs, the same logic applies to surgical suites and any space with air-handling sensitivity below the work zone.
The river valley climate here pushes moisture into a roof assembly year-round, all through the calendar and not only during storm season. Summer humidity keeps the membrane surface damp longer than it would in a drier region, which matters for adhesive cure times and for how quickly a small breach turns into a soaked insulation board. We size vapor retarders and insulation packages for that reality rather than defaulting to a generic spec sheet.
For most manufacturing and warehouse buildings we're replacing TPO or PVC over polyiso, chosen for seam strength and UV resistance through the long, hot Evansville summer. On lower-slope buildings with heavier foot traffic from rooftop equipment servicing, we'll sometimes recommend a fully adhered system over mechanically attached, since it holds up better against the wind events that move through the Tri-State in spring and early summer.
Once tear-off starts, the deck tells us things the roof surface never could. Rusted deck panels, rotted wood nailers, or fastener pull-out from a prior system all get flagged before a single new layer goes down. Skipping that step is how a brand-new membrane ends up failing in five years over a deck problem nobody caught.
Cover boards get specified more often than they used to, particularly on buildings with rooftop-mounted HVAC that techs are climbing around regularly, and on lower buildings more exposed to hail during spring thunderstorm season. It's a modest add to the budget that protects the membrane from punctures a bare polyiso board wouldn't survive.
When the last seam is welded and the roof is walked for final QC, we put together documentation the building owner can actually use, system layout, insulation R-value, warranty terms, and photos of the deck condition before it was covered. That record matters later, whether it's for insurance purposes, a future sale of the property, or just knowing what's under the membrane the next time maintenance needs to cut in a new curb for equipment.
We also walk the facility team through what routine maintenance the new system needs, since a reroof only holds its expected service life if drains stay clear and penetrations get checked twice a year. That handoff conversation is part of the job, not an upsell tacked on at the end.
It depends on square footage and how much of the building has to stay operational, but a mid-size plant roof typically runs several weeks when we're phasing the work around production and dry-in requirements each day.
In most cases, yes. We plan crane and material staging away from active dock doors and coordinate directly with plant maintenance so line operations continue underneath a roof that's being worked section by section.
Not always, but with multiple existing layers or wet insulation found during inspection, a full tear-off is usually the more durable and code-compliant path compared to another recover.
TPO and PVC single-ply systems with properly sized insulation and vapor control tend to perform well here, since seam strength and moisture resistance matter more in this climate than in drier regions.
We coordinate flashing details around existing curbs and equipment so manufacturer warranties on rooftop units stay intact, and we document any equipment that gets temporarily disconnected or reset during the project.