Commercial Roofing
A drip above a produce case or a bakery table is a food-safety decision for the store manager within minutes: pull the product, tape off the aisle and call someone about the roof. A grocery store in Edinburg, TX carries equipment that most retail roofs do not: refrigeration condensers, compressor racks, deli and bakery exhaust, and large makeup air units. The roof is a working platform for a store that runs on cold chain.
We start by learning which equipment sits where, then trace any leak from the stain backward across the roof. Photographs keyed to the drawing sort the roof into sound areas, moved areas and the one or two places where a quick test will settle the question.
Condensers and compressor racks are heavy and vibrate. They sit on rails or platforms that carry load into the roof, and the lines that serve them cross the membrane through pipe supports, curbs and penetrations. Vibration works on fasteners and sealants. Condensate and defrost water drain onto the roof in places, and a steady stream in one spot wears the surface and feeds ponding.
We check equipment supports, pads and walk paths, then the penetrations for refrigerant and electrical lines, then the places where condensate lands. Where rails have no protection pads, they abrade the membrane as they move with heat. Where lines rest on the surface, the contact points wear. A rooftop equipment curb and support repair restores pads, rebuilds flashing at curbs and relocates a drain line so it no longer falls on one spot.
Grocery stores have large open sales floors with ceilings of tile or exposed deck, and water that enters the roof travels the deck to a joint or fastener and drips above whatever is below. Stores with exposed decks show the drip directly; stores with ceilings show a stain after the tiles absorb it.
The manager tells us when the drip started and what the weather was doing; we plot those spots on the drawing and walk the roof upslope along them. An infrared scan with a few readings shows where the wet insulation ends. Because a drip above food has a high cost, the first response is temporary protection at the roof opening and a plan for the area below, and the permanent repair follows once the entry is found. A leak repair traced from the stain to the entry, with the area around it checked for moisture, keeps the same leak from returning.
Condensation deserves a separate check in a store with large cold cases. Cold lines and cases that sweat can drip onto ceiling tiles and look like a roof leak, and the reverse also happens. We compare the timing of drips with the weather and the store's defrost cycles. A stain that appears only after rain points to the roof. A stain that appears on dry days, at the same hour, points to the refrigeration or the air system, and we say so in the record so the right contractor is called the first time.
Grocery roofs in the Valley are commonly single-ply membranes or built-up and modified bitumen systems. Bakery and deli exhaust adds grease, and some membranes soften when grease lands on them. Where exhaust discharges onto the roof, we compare the surface near the outlet with clean membrane elsewhere and record the difference.
The assembly beneath the membrane matters too. Insulation thickness and type, cover board and deck affect how the roof holds fasteners, how it dries and how it carries equipment. We confirm the system from samples and records. Where grease has damaged the membrane, repairs need a clean, weldable or bondable surface, and sometimes a protective layer under the outlet. PVC roofing is often priced for zones with grease exposure because it resists many greases better than standard membranes. A grease containment pan under each fan keeps the problem from growing.
A grocery store's cooling and refrigeration loads peak across the Valley's May-to-October heat-safety months, and a hot roof adds to them. A reflective surface lowers the roof temperature, which is the case for a cool roof installation when a section is replaced. Heat also ages membranes and sealants and drives the daily movement at curbs and seams.
Storm season runs June through October. Dolly carried 50-to-70-mph gusts across Hidalgo County, and Hanna left wind and flooding in Edinburg in July 2020. For a grocery store, a storm can mean power loss and a rush of customers, so roof readiness is part of the store's plan. Before the season we check drains, edges, equipment fastening and temporary protection supplies. After a storm we inspect edges, flashings and equipment first.
The boundary follows moisture and membrane condition. A repair at a curb or exhaust extends to sound membrane around it. If insulation is wet beyond the immediate area, the boundary grows to include it. Because the area below holds food, the standard for tolerating damp insulation is stricter than for a warehouse.
When repairs recur, the owner compares continuing patches with a coating restoration or a replacement. A phased plan opens one section at a time, in an order that keeps the busiest departments dry. Price moves with the number of layers, the wet insulation, the units that must be lifted, access and the store's calendar, holiday peaks included. The city's 2018 building and energy codes set what the permit review will look at.
Food safety rules shape the plan. We ask the store manager and the district office about requirements for protecting product, covering open areas and controlling dust, debris and odor. Air intakes for makeup air and bakery ovens are covered or shifted, and no work is done above open food areas without protection in place below.
Customer routes, delivery docks, fire lanes and the parking lot are mapped and fenced, and lifts and staging stay clear of them. Refrigeration shutdowns are not acceptable, so units are left running and curbs are worked around, or lifts are planned with the refrigeration contractor. A section is opened only when it can be dried in before closing time, with tarps kept on the roof for sudden rain. Grocery owners with stores in Edinburg, Mission and Pharr can use the same record at each store. Related building types follow the same logic, as with big-box retail roofing and restaurant roofing.
We place temporary protection at the roof opening, advise the manager on protecting the area below and trace the entry for the permanent repair.
Not for most repairs. We work around running units, and plan any lift with the refrigeration contractor.
Grease softens many membranes near the outlet. We compare the surface there with clean membrane and add containment and a suitable repair.
Outside holiday peaks and ahead of the storm season, in sections that keep the busiest departments dry.
The city's building department reviews the permit under its adopted 2018 codes, and the scope we write already carries the insulation and edge details that review looks for.