Roof leak repair starts with finding the real entry point
The stain on the ceiling is rarely under the breach. Water enters at a seam, a flashing, a parapet joint or a skylight curb, runs along the deck or the insulation, and shows up somewhere else — often 10 to 20 feet away. Roof leak repair that starts at the stain is patching, and patching is why the same leak comes back after the next storm. The repair has to start where the water gets in.
On NYC flat roofs the usual suspects are predictable: failed seams and laps in modified bitumen, open counterflashing at parapets, cracked pitch pockets and equipment curbs, and drains that stopped draining. Commercial roof leak repair means tracing the water back to that detail and rebuilding it — not coating over it and hoping the coating bridges the gap through a winter of freeze-thaw.
Active leak into occupied space? We prioritize it. We talk you through interim protection on the phone, get a crew on the roof to find the source, and return for the permanent repair once the source is confirmed. Emergency roof leak repair is about stopping the water today and making sure you are not calling us again about the same spot in March.
What roof leak repair covers
Membrane & Seam Repair
Failed laps, open seams, blisters and punctures in modified bitumen or built-up roofing. We cut out the failed section, prime the substrate and rebuild it with matching mod bit or a PMMA liquid flashing — a bonded repair, not a smear of mastic over granules.
Flashing & Parapet Leaks
Counterflashing, through-wall flashing and coping are where most NYC roof leaks actually originate. Resealing the joint lasts a season. We rebuild the flashing in the roof's own system so the termination sheds water the way it was designed to.
Skylight & Curb Leaks
Skylights, HVAC curbs and pipe penetrations are roof details, not accessories. We strip the curb, rebuild the membrane turn-up and counterflashing, and reset the unit. Skylight leak repair has its own page if that is your only problem.
Drainage & Ponding
Clogged drains, missing strainers, failed scuppers and low spots keep water on the roof long enough to find a way through. We clear and rebuild drains, correct scuppers and add tapered insulation where ponding is structural rather than seasonal.
Infrared Roof Leak Scanning
When the surface looks fine and the ceiling says otherwise, infrared thermography maps wet insulation under the membrane so we repair the saturated area, not a guess. Core sampling confirms what the scan shows before we cut.
Commercial Leak Specialists
Multi-tenant commercial, co-op and condo roofs carry dozens of penetrations and several generations of repairs. We document each one, separate the active leak from the historical ones, and give the board or manager a scope they can act on.
Stop Roof Leaks at Source
Every roof leak repair we do is aimed at the entry point, not the symptom. Interior patching, ceiling tiles and buckets are the building's problem to manage; our job is to make sure the water stops arriving. One root-cause repair at the source ends the service-call cycle.
Recent NYC projects
Free Roof Leak Inspection, then Root-Cause Leak Diagnosis
Free Roof Leak Inspection. We walk the roof, test the drains, photograph every detail near the interior damage and check the obvious entry points first — seams, flashings, curbs, scuppers. Most leaks are found here. The inspection is free across Manhattan, Brooklyn, Queens and the Bronx.
Root-Cause Leak Diagnosis. When the walk is inconclusive we run an infrared scan after sunset to map trapped moisture, then take a core where the scan says the insulation is wet. You get the entry point, not a list of possibilities.
Written scope with the reasoning. The estimate names the detail that failed, why it failed and what the repair rebuilds. If the roof is near the end of its life we say so and show you what a repair buys you versus a section replacement.
Permanent repair by in-house crews, DOB-compliant. Our own roofers do the work — no subcontracted patch crew. Flashings are rebuilt in the roof's system, seams are torched or cold-applied to match, and liquid PMMA is used where a detail cannot be sheet-flashed.
Photo close-out. You receive before-and-after photos of the repair, the location on a roof plan and a short note on anything else the roof will need in the next year or two. Permanent fixes, not patches, is the whole point of the process.
What NYC building owners say
Roof leaking after rain?
Free roof leak inspection in Manhattan, Brooklyn, Queens and the Bronx.
Frequently Asked Questions
Permanent fixes, not patches.
One root-cause repair beats ten service calls. Get the roof leak fixed today.
Related: Roof Leak Detection NYC