Commercial Roof Repairs With a Documented Cause and Fix

Where water shows up inside is rarely where it enters the roof. On a steel deck, water runs along the flutes; in an insulated assembly, it travels through wet board and drops at a seam or a fastener far from the breach. Our first step is to interview the tenant or facility staff about when the leak appears, whether it follows wind-driven rain or steady rain, and whether it coincides with HVAC condensate cycles, which are often mistaken for roof leaks.

On the roof we trace the drainage path uphill from the point above the interior stain, inspect seams, flashings, penetrations, and drains along that path, and water test when the source is not obvious. Interior protection comes first: tenants' inventory, equipment, and finishes are covered or moved before any water testing begins. Temporary measures are applied on the same visit when a permanent repair needs material or dry conditions, and the plan for the permanent fix is in writing before we leave.

Seams are the engineered weak point of any membrane roof, and they fail differently by system. On TPO and PVC, a cold weld, a weld void, or a wrinkle welded into the seam can open under thermal cycling and foot traffic. On EPDM, older adhesive-spliced seams and seam tape that has lost its bond are the usual suspects, along with fishmouths where the sheet lifted during installation. On modified bitumen and built-up roofs, an open lap or a lap that was never fully heated or mopped lets water into the plies.

The repair is system-specific. Thermoplastic seams are cleaned and re-welded with a cover strip of new membrane; EPDM seams are cleaned, primed, and covered with seam tape or cover tape; asphalt-based laps are reset with compatible materials. Aged membranes complicate the work, and part of our assessment is confirming that the existing material can still accept a bonded repair rather than simply hiding a failure under sealant.

Most roof leaks on commercial buildings originate at a flashing, not in the open field. Curbs for rooftop units, pipe penetrations, pitch pockets that have dried and cracked, wall flashings that have slipped below the counterflashing, loose termination bars, and failed sealant joints at edge metal all let water behind the membrane. Charlotte's heat and UV accelerate sealant failure, and summer storm winds work at any flashing that has started to lift.

We repair flashings to the manufacturer's standard details whenever possible instead of relying on sealant as the primary waterproofing layer. That often means replacing a pipe boot, re-flashing a curb with new membrane, rebuilding a pitch pocket with a pourable sealer, or installing a proper two-piece counterflashing where none existed. Sealant has its place at terminations and metal joints, but a repair that depends on caulk alone will be back on the schedule within a few seasons.

Water that remains on a low-slope roof roughly two days after rain is generally considered ponding, and it is a problem in its own right. Ponded water adds load to the structure, concentrates dirt and biological growth, accelerates membrane aging, and turns a pinhole into a steady leak. Common causes include clogged drains and strainers, deck deflection, compressed or collapsed insulation, and inadequate slope in the original design.

The fix depends on the cause. Clearing drains and resetting clamping rings is maintenance. Adding a drain, installing an overflow scupper, or building crickets with tapered insulation is a repair project. Deflection and structural movement call for an engineer. Scupper boxes and conductor heads are checked for rust-through and open soldered joints, because a failed scupper sends water straight into the wall.

Every repair we perform is documented so the owner, asset manager, or property management company can see what was found and what was done without visiting the roof. A clear report also builds the maintenance history that a future buyer, lender, or insurer will ask for.

A single leak is a repair. A pattern of leaks across a roof that is at or near the typical service life for its membrane type is a different conversation, and we would rather have it directly than keep billing repairs on a roof that cannot be made reliable. We look at the share of wet insulation, the overall condition of seams and flashings, the membrane's remaining flexibility, and how often the roof has needed attention over the last several years.

Restoration with a fluid-applied coating system can extend a roof that is structurally sound and mostly dry but showing surface aging. Replacement is the answer when wet insulation is widespread or the membrane has lost its ability to be repaired. We lay out the options with their expected service extension and let your capital plan drive the choice.

For owners with several buildings, individual repair reports accumulate into a condition record for each roof. We can summarize those records into a simple ranking of which roofs are stable, which need a planned repair campaign, and which are candidates for restoration or replacement in the next budget cycle, so capital decisions are made from the same documentation the field crews produced.