IKO Flashing Replacement in San Antonio, TX

IKO Flashing Replacement: The San Antonio Owner’s Guide

IKO flashing replacement in San Antonio typically runs $280-$520 installed, depending on linear footage, roof pitch, and whether we’re matching existing IKO color profiles or transitioning to a compatible aftermarket system. We stock IKO-compatible step flashing, counter flashing, and drip edge profiles on every Ridgeline truck, and most residential replacements are completed in a single visit. Most San Antonio homeowners discover their IKO flashing has failed after a hard rain leaves water stains on ceiling corners, or when they spot daylight showing through gaps where the metal has pulled away from brick or siding.

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Which IKO Models This Applies To

IKO flashing systems vary by shingle line, and matching the right profile matters for both water tightness and visual consistency. The IKO Cambridge architectural series uses a 4-inch by 7-inch step flashing with a heavier 28-gauge galvanized finish, while the IKO Marathon 25 three-tab line pairs with a lighter 30-gauge profile that some homeowners mistake as interchangeable. If you’re checking your own roof, look for the IKO stamp on the exposed flange edge, or measure the vertical leg: Cambridge and Dynasty lines run 4 inches up the wall, while older IKO Royal Estate installations sometimes used a 5-inch custom bend that’s now special-order only.

We carry both OEM IKO flashing and quality aftermarket equivalents from Drip Edge Plus and Metal-Era on every truck. For homes in Alamo Heights or Terrell Hills with strict HOA color matching, OEM IKO in Weathered Wood or Driftwood usually wins. In Windcrest or Live Oak, where the priority is function over exact color match, our aftermarket equivalents carry the same 20-year corrosion warranty and save roughly 15 percent on material cost. Cecil Hargrove makes the call on-site after seeing what’s up there - he’s not about to sell you a premium part when a standard one will do the job, or a standard one when only the IKO profile will keep your lines straight.

Signs Your IKO Flashing Replacement Is Failing

• Water stains on interior ceiling corners. This is the classic tell. When IKO step flashing corrodes at the 90-degree bend or pulls its nails, water tracks down the wall plate and pools in the corner framing. In San Antonio’s climate, the galvanized coating on older IKO flashing often degrades faster on south-facing walls where UV and thermal cycling are hardest.
• Visible gaps between flashing and brick or siding. Caulk was never meant to be the primary seal. If you can slide a putty knife between the flashing leg and the wall, the fastening system has failed. On IKO systems, this usually means the fastening flange has rusted through or the expansion anchors in masonry have backed out.
• Granule buildup in gutters below valley or wall joints. Those granules aren’t coming from normal shingle wear. They’re washing out from the point where failed flashing lets water run backward under the IKO shingle tabs, undermining the adhesive strip and loosening granules from below.
• Rust streaks on exterior walls below roof-wall intersections. IKO flashing uses a painted galvanized steel, and once that paint film cracks, San Antonio humidity does the rest. The rust you see on the wall is often the symptom; the real damage is the pinhole corrosion eating through the flashing channel above.
• Soft or discolored decking at eaves or rake edges. IKO drip edge flashing that has lost its downward pitch lets water wick back toward the fascia. In neighborhoods like Monte Vista or King William with older homes, this often goes undetected until the fascia board sponges and the gutter starts to sag.

Replacement Cost & What’s Included

Every Ridgeline flashing replacement includes removal of the failed section, inspection of the underlying decking and underlayment, installation of new IKO-compatible flashing integrated with existing shingles, and sealant at all termination points. We photo-document before and after, and the work carries our 90-Day Done Right Promise - if water gets through, we come back. No paperwork, no arguing. The number on your estimate is the number on your invoice.

DIY or Call Us?

There’s a safe middle ground here. A homeowner can check for the symptoms above from a ladder or with binoculars, and you should - catching flashing failure early saves the decking. But replacing flashing means working at roof-wall intersections where shingles overlap, underlayment must be lifted without tearing, and proper integration depends on getting the weave pattern right between step flashing courses. One misaligned piece and you’ve built a funnel instead of a shield.

We’re not going to pretend this is rocket science. But we’ve also seen too many San Antonio homeowners spend a Saturday on the roof only to call us Monday when the stain on the ceiling got bigger, not smaller. If you’re comfortable on a ladder and have done shingle repair before, you might manage a straight 6-foot drip edge run. For anything involving walls, chimneys, or valleys, the labor cost usually pays for itself in the warranty alone. Call (833) 756-5022 and we’ll give you an honest read on whether your situation is a DIY candidate or a call-the-pro situation. Estimates are free, and a live person answers.

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