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Keystone Commercial Roofing Contractors has been repairing, maintaining, and installing roofs on commercial and institutional buildings across New York since 2004. We work exclusively on commercial property (offices, retail, mixed-use buildings, warehouses, institutional, and government facilities) and do not take on residential work.
$2M general liability insurance
These are the failures we see on the systems we repair: TPO, PVC, EPDM, built-up and modified bitumen. Each can allow water into the building, but the underlying cause and repair are different.
Each failure above gets a specific fix, not a generic patch. Here’s what the repair actually involves.
We cut back to sound material, then re-seal or re-weld the section and tie it into the surrounding membrane.
Failed flashing at parapets, curbs and edges is cut back to sound material, replaced, and tied into the membrane. A bead of sealant over a lifted edge isn’t a repair.
We trace ponding to its cause first, whether that’s a blocked drain, an undersized one, or a low spot in the deck, before we touch anything.
Small damage gets a matching patch; larger failed sections are cut out and replaced.
Saturated insulation comes out and is replaced before new membrane goes down.
Penetrations are re-sealed and re-flashed at the base, not just recaulked over the old failure.
Every failure does not mean a new roof. Here’s how we tell the difference.
A 12-year-old TPO roof was leaking into a second-floor unit after every heavy rain. Inspection traced it to failed seams along the north parapet, not the penetration the owner suspected. We cut back and re-welded roughly 80 linear feet of seam and replaced the adjacent flashing.
A modified bitumen roof on a warehouse was ponding water for days after every rain. The drains were clear, so the cause was a low spot where the deck had settled over the years, not the drains themselves. We built up the substrate to correct the slope and re-flashed the surrounding membrane. The area now drains within hours of a storm.
We provide commercial roof repair across New York City: Manhattan, the Bronx, Brooklyn, Queens, Staten Island, Westchester County and Nassau County. See our pages on roof repair in Brooklyn and roof repair in the Bronx for how that looks locally. Every location we serve gets the same crews and the same standard of work.
Repair on an occupied commercial building has its own logistics. That means roof access without disrupting the business underneath, staging materials with no ground-level yard, and scheduling around a loading dock or freight elevator that belongs to someone else. We coordinate all of that before the first tool goes up.
Repair is one part of our work as commercial roofing contractors in NYC, and all our services are listed on one page.
Isolated problem, sound roof otherwise: repair. Failures in multiple places, or membrane deteriorating broadly: replacement. We confirm which after we’ve actually looked.
This page covers scheduled repair: problems you can describe and wait a day or two on. If water is actively coming through right now, use the emergency link at the top of this page instead.
Yes. We hold MBE, DBE and LBE certification.
Yes. We carry $2 million in general liability coverage, and our crews follow OSHA safety standards. That matters more on repair work than on most jobs, since it’s often work at height over a sidewalk or lot still in use.
We repair single-ply membranes including TPO, PVC and EPDM, as well as built-up and modified bitumen systems. If you’re not sure what’s on your roof, send a photo and the building address.
Repair cost depends on the roofing system, the extent of the damage and roof access (occupied building vs. vacant, loading dock vs. street level). A single failed seam repair is a very different job from a section of wet insulation removal. We give a firm number after inspection, at no charge for the look.
Describe what you’re seeing, or send a photo and the building address. Whether it’s a failed seam like East Harlem or a drainage fix like Sunset Park, we’ll tell you what it needs and what it costs to fix it. Every job is backed by $2 million in general liability coverage, and we can provide our MBE, DBE and LBE certification documentation when a project requires it.
Commercial roofing across Manhattan, Brooklyn, the Bronx, Queens, Staten Island, Westchester, and Nassau. MBE, DBE, and LBE certified, OSHA-compliant crews, and $2 million in general liability coverage since 2004.
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