IKO Flashing Replacement: The New York City Owner’s Guide
IKO flashing replacement in New York City typically runs $340-$780 installed, depending on the location and linear footage involved, and we stock the common IKO profiles for same-day service in most cases. Homeowners usually discover the problem during a hard rain, when water shows up at a chimney corner or wall joint that was dry for years. In a city where freeze-thaw cycles run from November through March, metal flashing takes more punishment than shingles ever will.
Which IKO Models This Applies To
IKO’s flashing ecosystem breaks down into three main families: the pre-bent step flashing paired with Cambridge and Dynasty architectural shingles, the continuous drip-edge and rake flashing used with Marathon 25 three-tabs, and the custom valley and wall flashings specified for their Armourshake and Crowne Slate premium lines. The critical detail is gauge and profile match. IKO step flashing for Cambridge is typically 0.019-inch pre-painted aluminum, 8 inches by 10 inches, with a specific kick-out bend that channels water into the gutter rather than behind the fascia. We’ve seen homeowners in Astoria and Bay Ridge buy generic 7-by-9 step flashing from a big-box store, only to find it leaves a half-inch gap at the eave that funnels water straight to the sill plate.
IKO’s OEM flashing carries the part number prefix “IKO-FL” followed by the profile code, stamped on the backside of pre-formed pieces. For older IKO roofs, especially the 1990s-era GlassSeal installations still common in parts of the Bronx and eastern Queens, the original flashing was often 28-gauge galvanized steel rather than aluminum. That matters because galvanic corrosion between old steel and new aluminum fasteners will eat through both in about four years. We keep both materials on the truck, and we’ll match what your roof was built with. We’re an independent service provider, not affiliated with IKO, but we source their OEM profiles and maintain cross-reference sheets for GAF, Owens Corning, and CertainTeed equivalents when a homeowner wants to compare.
Signs Your IKO Flashing Replacement Is Failing
- Water stains on interior walls below roof-wall junctions. This usually means step flashing has lifted or the sealant bed has cracked. In New York City’s row house stock, where sidewalls are often shared and inaccessible from the ground, the first sign is often a plaster bubble forming six inches below the ceiling line on an upstairs bedroom wall.
- Rust streaks running down brick or siding from chimney corners. IKO’s counter-flashing is typically embedded in mortar joints; when that seal fails, the underlying base flashing corrodes. We’ve replaced chimney flashings in Forest Hills where the mortar was sound but the 20-year-old galvanized base had simply worn through at the bend.
- Ice buildup along eaves that seems worse in one specific section. This points to drip-edge flashing that’s pulled away from the fascia, letting warm attic air melt snow from underneath. The resulting ice dam isn’t a ventilation problem; it’s a flashing gap that needs to be re-secured or replaced.
- Shingle edges curling or granule loss in a straight line near a wall or chimney. Water wicking backward under improperly lapped step flashing saturates the shingle substrate from below. The damage pattern is diagnostic: a straight line of deterioration, not the random wear of normal aging.
- Daylight visible from the attic where a dormer meets the main roof. In Brooklyn’s Victorian-era homes with added dormers, the original IKO flashing was sometimes field-bent on site and never properly sealed at the corners. That gap expands and contracts with every temperature swing until it’s a quarter-inch channel for wind-driven rain.
Replacement Cost & What’s Included
| Flashing Type | Typical Range (Installed) | What Drives the Price |
|---|---|---|
| Step flashing (per linear foot) | $18-$32 | Height of wall, shingle removal/replacement, access difficulty |
| Chimney counter-flashing | $340-$680 | Mortar cutting, custom bending, two-piece base/cap system |
| Drip-edge replacement (full eave/rake) | $280-$520 | Linear footage, fascia condition, gutter removal |
| Valley flashing (open or closed) | $420-$780 | Length, ice-and-water shield integration, shingle type |
These are New York City prices, and they reflect what we actually charge, not a national average pulled from a database. A chimney flashing in a tight Queens courtyard with no driveway access takes longer than the same job on a freestanding Staten Island home. Our estimate includes removal of the failed flashing, inspection of the underlying sheathing, installation of new material with compatible fasteners and sealants, and shingle repair or replacement as needed. Every flashing job carries our 90-Day Done Right Promise: if water finds a path we missed, we come back and make it right, no paperwork, no arguing. The number we quote is the number on the invoice.
DIY or Call Us?
There’s a short list of things a homeowner can safely check from inside: look in the attic during rain for active drips, note the location of any stains, and take photos. That information saves us time and saves you money on the diagnostic.
What we don’t recommend is ladder work on a New York City roof. The flashing itself isn’t the danger; it’s the combination of steep pitches, parapet walls that hide drop-offs, and the fact that proper installation requires removing and replacing shingles without tearing them. We’ve been called to jobs in Washington Heights where a homeowner’s DIY attempt damaged three courses of good shingles trying to pry up one piece of step flashing. The repair cost doubled. For chimney work, you’re dealing with mortar cutting and hot-applied sealants that require a steady hand at height. Call (866) 756-1978 and we’ll give you an honest assessment of whether it’s a quick fix or a full replacement. Estimates are free, and a live person answers the phone.
FAQs
Properly installed aluminum flashing typically holds 15-20 years in the five boroughs, though galvanic pairing, poor shingle overlap, or salt air exposure in coastal Brooklyn and Queens can cut that to 10. The freeze-thaw cycle is the real enemy: water gets behind a loose corner, expands when it freezes, and progressively loosens the whole assembly. Call (866) 756-1978 for a photo-documented inspection if you’re past year 12.
Small sealant failures at a corner or seam can sometimes be addressed with proper cleaning and re-sealing, but once aluminum has cracked or galvanized steel has rusted through, patching is a temporary fix that usually fails within two winters. We don’t do patches we wouldn’t stand behind. For an honest read on repair versus replacement, call (866) 756-1978 - estimates are free.
Most residential flashing replacements are completed in a single visit of 2-4 hours. Chimney jobs with mortar cutting run longer, typically a half day. We arrive with the material on the truck, so there’s no waiting for a second trip. Same-day scheduling is available for active leaks.
We stock the common IKO profiles - step, drip-edge, and standard chimney base - on every service vehicle. Specialty colors or custom bends for older IKO systems may require 24-48 hours, but we’ll know once we see the roof. Call (866) 756-1978 and we’ll confirm availability for your specific setup.
A roof doesn’t lie. Neither do we. We’ve been working on New York City roofs since 2016, and we’ve learned that the unglamorous details - getting the flashing right the first time - are what separate a roof that holds for twenty years from one that needs a callback in three. If your IKO flashing is showing its age, call (866) 756-1978. A live person will answer, we’ll schedule a photo-documented inspection at your convenience, and you’ll get upfront pricing with no surprises. We stand behind it - no paperwork, no arguing.
Written by Sal Benedetto, Owner, Ridgeline Roofing Co. of New York City at Ridgeline Roofing Co. of New York City, serving New York City and nearby areas.