Follow Us:
Follow Us:
On a New York commercial roof, metal usually shows up in the details: parapet coping, edge metal, flashings, gutters and leaders, plus steep-slope elements like mansards and bulkheads.
Keystone Commercial Roofing handles the metal details on New York commercial buildings, not just the rare whole metal roof.
$2M general liability insurance
A roof gets called “cool” for two separate reasons, and most conversations about it only cover one.
A reflective surface changes how much heat gets into the building through the roof, in a few specific places.
It sits directly on the surface it’s fighting against. A cooler roof reduces the heat transferred through the roof assembly into the building, which can lower the cooling load the HVAC system has to work against.
Less heat moving through the roof assembly means less of it reaching the ceiling below, usually where tenant complaints start every summer.
A dark membrane reaches far higher surface temperatures in direct sun than a reflective one, and that gap matters for thermal cycling, the daily expansion and contraction that stresses seams and flashing over years of exposure.
The building’s insulation level, its HVAC capacity, or any other source of heat gain that has nothing to do with the roof surface.
Most commercial buildings in this city don’t have metal covering the entire roof field. What they do have is metal throughout the roof’s critical details, and that distinction is the entire point of this page. Almost every one of them has metal somewhere on the roof, and that distinction is the entire point of this page.
Parapet coping and edge metal cap the top of a wall or the perimeter of a roof, exactly where wind, water, and thermal movement all concentrate at once. Counterflashing protects the upper edge of base flashing at walls and other transitions, while properly detailed flashing around curbs and penetrations keeps water from working into the roof assembly.
Gutters, leaders, and scuppers move water off the roof once it gets there, and a system nobody’s cleared in years is often the actual cause of a problem that looks like a roof leak but isn’t.
Mansards, bulkheads, penthouses, and canopies are the steep-slope elements sitting on top of an otherwise low-slope building. Older New York buildings often carry these in a profile nobody makes as a stock item anymore.
Equipment screens and roof-level enclosures round out the list, metal work that has nothing to do with weathertightness directly but still needs to be built and fitted correctly around everything else up there.
Copper develops its own protective patina over time and is often specified on older or landmark buildings where appearance and longevity both matter. Zinc forms a similar self-protecting surface and performs well across a range of exposures.
Aluminum resists corrosion well on its own and stays relatively light, a real factor on a roof where added weight isn’t free. Galvalume and galvanized steel both carry a protective coating over a steel base, a common, economical choice for flashing and general sheet metal work.
Stainless steel is selected where high corrosion resistance and durability justify its higher material cost, though how it compares to copper or zinc depends on the specific environment.
Why it matters which metals touch each other: different metals in direct contact, especially in the presence of moisture, can drive galvanic corrosion, one metal degrading faster than it would on its own because of that contact. Getting metal details right isn’t just about picking one good material, it’s about knowing which combinations actually hold up together over years of exposure.
We fabricate, repair, replace, and install commercial roof metal, including parapet coping, edge metal, counterflashing, gutters, leaders, equipment screens, mansard and bulkhead components, and other custom-fabricated details. The scope depends on the existing roof assembly, dimensions, material, and the condition of the surrounding substrate.
Where a building does use standing seam metal roofing, the raised seams and concealed clips work together to let panels accommodate thermal movement while keeping the roof watertight.
Soldered, mechanically joined, and sealed connections show up at transitions, terminations, and connections where two pieces of metal meet at an angle rather than in a straight run, details a standing-seam panel system alone doesn’t resolve.
Expansion and contraction happen on every metal roof or metal detail. Temperature swings make metal grow and shrink measurably over a day, let alone a season, and a detail that doesn’t account for that movement eventually works itself loose or splits at a fixed point.
Fasteners, clips, and where they let go matter more than they sound like they should. A fastener that’s rigid where the metal needs to move is often the actual point of failure, not the metal itself.
Send a photo of the parapet or gutter line. We’ll identify the visible metal issue and explain what the next step may involve.
Older New York buildings often carry metal profiles nobody makes as a stock item anymore, a coping shape, a specific mansard detail, a canopy edge formed to match a building that’s no longer typical.
Measuring and templating on site is where accurate metal work starts, taking the actual dimensions and angles of what’s there rather than working from an assumed standard. Shop-formed pieces get fabricated off-site to those measurements; site-formed work gets shaped directly on location where a shop-formed piece wouldn’t fit or transport well.
Matching what’s already there, in profile, in material, and in how it was originally detailed, is usually the real goal on an older building, not replacing it with whatever’s easiest to source.
Send a photo of the existing profile and the building address, and we’ll tell you what it would take to match it.
Open joints and failed sealant are usually the first sign something’s wrong, a seam or a soldered connection that’s opened up enough to let water through, often well before it’s visible as a leak inside.
Rust and coating failure show up differently depending on the metal. Exposed steel rusts visibly; other metals show it as pitting or a change in the surface finish rather than obvious orange rust.
Wind, storm, and impact damage can lift, bend, or tear metal that was otherwise sound, sometimes creating a new entry point for water at a spot that had never leaked before.
When a detail gets replaced rather than patched usually comes down to how much of the original material is still sound. A single failed section on an otherwise intact run of coping is a repair.
Widespread failure across the same detail, or damage that’s opened the underlying structure to more exposure, usually isn’t, and if the metal is part of a wider roof problem, the repair scope may extend into commercial roof repair beyond the sheet metal itself.
Send a photo of the damaged metal, and we’ll tell you whether it’s a repair or a replacement.
We handle coping, flashing, gutters, and metal roofing details across Manhattan, the Bronx, Brooklyn, Queens, Staten Island, Westchester County, and Nassau County.
Coping, flashing, gutters, and other metal details are exactly what most of this work actually is. A whole metal roof is less common than metal used throughout individual roof details on New York commercial buildings, and we handle both.
Different metals in direct contact, especially with moisture present, can cause galvanic corrosion, where one metal degrades faster because of contact with the other. Getting the combination right matters as much as picking a good material on its own.
Often, yes, by measuring and templating what’s actually there rather than working from a stock item. Send a photo and we’ll tell you what’s involved.
Yes, $2 million in general liability coverage, and our crews follow OSHA-compliant safety practices for roof and edge work.
All five boroughs, plus Westchester and Nassau counties.
Call (646) 851-3145 or send a photo of the parapet, gutter line, or damaged detail, and we’ll tell you what the next step looks like.
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.
Copyright © 2026 Keystone Commercial Roofing Contractors.