Commercial Roofing
A flex building with five tenants has one roof and five opinions about it. The front office space of one unit stays dry, the rear warehouse bay of the next shows a stain at the dock door, and a third tenant added a rooftop unit last year and cannot say who cut the curb. On a flex or light-industrial building in Edinburg, TX, I begin by sorting those tenant-driven changes from the original roof, because every added unit, vent and exhaust fan is a penetration that someone has to maintain.
These buildings are a blend of office, showroom, light manufacturing and storage under a continuous roof, usually divided by demising walls. The roof is shared, but the problems are local to a bay, and the owner needs a record that shows which parts of the roof are in good shape, which are worn, and which tenant changes created risk.
Flex buildings change tenants and uses more often than a single-user warehouse does. Each change can bring a new rooftop unit, a new exhaust fan, a new gas line or a conduit run across the roof. Every one of those is a penetration, and each curb or pipe boot relies on flashing, sealant and a patch that may have been installed under time pressure by someone who will not return.
We look for stacked repairs, mismatched materials, unsealed pipe supports and equipment that sits directly on the membrane. The usual culprits are curb flashings that were not tied into the membrane, pitch pockets that have dried out and equipment sleepers that rub holes in the roof. A rooftop equipment curb and support repair often removes the leak and protects the membrane from future movement.
A demising wall may stop at the roof deck or run up to the underside, and either way water can pass over or through it. A leak that shows in one tenant's warehouse may enter the roof two bays away, travel along a joist and drop at the first low point. At a dock door, water can enter at the parapet above the overhead door and run down the inside of the wall into a bay that looks dry above.
We trace from the interior stain backward to the nearest penetration, wall tie-in or drain, then confirm the path on the roof with moisture readings. An infrared moisture survey maps the wet insulation so the owner can see how far the problem extends and whether more than one tenant is affected. The map also helps owners apportion the cost fairly and explain the repair to tenants, who are more cooperative when they can see the wet area on a drawing than when they are told a leak exists somewhere above them.
The National Weather Service in Brownsville calls May through October the heat-safety season for the Rio Grande Valley, and a low-slope flex roof takes that heat for months. Seams, sealants and the flashing laps around every curb flex through the daily cycle. Light-colored membranes reduce the load, and a reflective surface over a unit with air conditioning can help comfort inside.
Tropical season here stretches from June into October. Hurricane Hanna's July 2020 visit brought wind and flooding to Edinburg, and Hurricane Dolly's earlier 50-to-70-mph gusts crossed the county, so parapet caps and edge metal on a long flex building deserve attention after any tropical wind. After a storm, we check parapet caps, edge metal, rooftop equipment and drains, because a blocked scupper on a flat roof turns heavy rain into standing water. A ponding water repair may be as simple as clearing the outlet or as involved as adding a drain or tapered insulation.
If the moisture sits in one bay and the rest of the roof is dry and sound, the repair boundary can stay inside that bay. If the same roof shows wet insulation across several bays, repeated leaks at different details and a membrane that cracks or shrinks, the owner is carrying the cost of a replacement in pieces. The photo record puts both choices in front of the owner with measurements.
Cost moves with the layers to remove, the area of wet insulation, the number of penetrations, the equipment to be disconnected and reset, and how long tenants can accept access limits. A replacement permit is reviewed against the city's 2018 building and energy codes, so insulation and fastening are settled in the scope. Owners near the north commercial corridor, where road improvements on Doolittle Road and FM 2812 are planned, follow the same steps, and a commercial roof replacement can be phased by bay or by building.
Yes. The usual approach is to repair active leaks first, then restore or replace the worst sections in a sequence that matches lease turnover and the budget calendar. A bay between tenants is an ideal window to open a section of roof, because no one is working beneath it. Tenants are given notice, and dry-in is completed daily.
For sound roofs with dry insulation, roof coating restoration reduces disruption and spreads cost. A full tear-off suits roofs with wet insulation or failed seams, and TPO roofing is a common choice for low-slope flex buildings. Logistics, warehousing, manufacturing and food processing are all part of the local employment base, and flex space can serve those users on a small scale, much as warehouse roofing serves the large ones, while front office bays follow office building roofing. The same discipline that protects a small tenant's stock protects the owner's rent roll.
That depends on the lease, and the owner's attorney answers it. Our part is the record: photographs of the curb, the equipment and the damage, with the date. A clear record of what was installed and when gives the owner the basis to discuss responsibility with the tenant.
Have them removed or capped properly. Old vent pipes, capped conduits and unused curbs are common leak points because the flashing ages while nobody is looking at them. We list each abandoned item on the roof plan and recommend removal when the roof is next worked on.
It can be, if the insulation is dry and the penetrations are flashed first. A coating bridges small defects but does not fix a broken curb. We repair and reflash each detail, confirm dryness with readings, and then coat the field. The preparation costs more than the coat itself.
Dock doors are protected with overhead covers or the crew works from the opposite side of the building. We talk with the tenant about truck times, set aside a staging area away from trailers, and keep the dock approach clear. Roof work above a dock is timed for hours with the fewest deliveries.
It shows the roof areas, apparent age if known, condition, moisture findings and the work likely needed over the next few years. A buyer can price the property with those facts in hand, and a lender sees that the roof was evaluated by someone who walked it.