Flex buildings around Evansville's industrial parks split into office storefronts up front and warehouse or light assembly bays in back, often leased to two or three different businesses under one roofline. That mix creates roofing problems a single-tenant warehouse never sees.
A flex building's roof plan usually shows a single membrane running over a demising wall that separates completely different operations underneath. We've quoted jobs where one bay ran a print shop with a small package HVAC unit and the next bay over ran a machine shop with a larger rooftop condensing unit and welding exhaust vents. The membrane still has to perform as one continuous system, but every penetration and load point is different tenant to tenant.
That matters most at roof drains and low points. If a tenant build-out adds a mezzanine or storage racking near a drain, roof loading changes in ways the original design never accounted for, and it's the property owner, not the tenant, who ends up dealing with ponding.
Flex parks tend to accumulate rooftop units over time as tenants change and each new lease brings its own HVAC contractor to the roof. We see membrane damage most often around units installed by mechanical contractors who weren't thinking about the roofing warranty when they set curbs or ran conduit across the field.
For owners with multiple tenants, we recommend a single approved roofing contractor of record for any rooftop penetration, even minor ones, so warranty coverage doesn't get voided by someone else's fastener pattern. It's a small policy that saves real money at renewal time.
Where an existing built-up or modified bitumen roof over the office frontage is still structurally sound but showing its age, a silicone coating extends life without a full tear-off, and it's the option we bring up first for owners trying to keep a flex property's costs predictable between capital cycles. On the warehouse side, TPO remains the standard for new installs and full re-roofs given the reflectivity and seam reliability across a large open field.
We size the roof plan to the building's tenant mix rather than treating a flex property like a single-use warehouse, because the traffic pattern, the penetration count, and the drainage load all differ from a straight distribution building.
Some of the older flex parks around Evansville were built with exposed-fastener metal panel roofs rather than a low-slope membrane, and those buildings need a different maintenance approach: fastener backout, panel seam sealant failure, and rust at cut edges are the issues that show up first, not membrane punctures. We inspect fastener condition on a metal panel flex roof on a tighter interval than we would a TPO roof, since a few dozen loose screws can turn into a widespread leak fast once wind gets under a panel edge.
When a metal panel flex roof reaches the point of needing more than spot repair, a retrofit membrane system over the existing panels is often more cost effective than a full structural tear-off, as long as the panel profile and slope work with the retrofit system's design.
Some flex properties carry a shared common-area roof section, like a small lobby or shared restroom core between tenant suites, that doesn't belong to any single lease. We flag those areas separately in a condition report so the owner knows which square footage isn't covered by a specific tenant's maintenance responsibility.
Pylon and monument signage at flex parks sometimes ties into the roof structure at the building line, and we check that connection point during any full roof survey, since a sign structure moving even slightly in high wind can work a membrane seam loose nearby.
Yes. We track condition by bay and by mechanical contractor so a problem tied to one tenant's HVAC install doesn't get charged against the whole roof's warranty.
For most membrane types, yes, as long as the section ties into sound field membrane at the seams. We'll tell you up front if a patch job risks a mismatched warranty versus a full section replacement.
That's a lease and insurance question more than a roofing one, but we document any damage we find with photos and a written condition report so the owner has something to work from.
Usually, if the substrate is still sound underneath. We'll core-cut a few spots first to check for trapped moisture before recommending a coating over a roof with a long repair history.
Twice a year at minimum, plus after any new tenant build-out that adds rooftop equipment or interior loading.