IKO Flashing Replacement in California, CA

IKO Flashing Replacement: The California Owner’s Guide

IKO flashing replacement in California typically runs $280-$520 installed for standard residential applications, and we stock the most common IKO-compatible profiles on our trucks for same-day completion. Most homeowners discover the problem during our first good rain of the season, when water shows up inside where it has no business being. The flashing itself is a thin, folded metal strip that seals the joints where your roof meets walls, chimneys, skylights, or vent stacks, and on IKO systems it’s sized to specific deck tolerances that generic flashing often misses.

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Which IKO Models This Applies To

IKO’s residential lines in California fall into three main series: Cambridge Architectural, Dynasty, and Marathon Plus. Each uses slightly different deck heights, which means the step flashing and counterflashing profiles need to match or you’ll end up with a gap that caulk was never meant to solve.

The fastest way to identify your part is to check the underside of an exposed shingle tab for the IKO stamp, or look for a specification label on the ridge vent if your flashing ties into it. We carry OEM-gauge galvanized steel and aluminum equivalents that match IKO’s 0.019″ minimum for step flashing and 0.024″ for chimney saddles. Aftermarket options exist, but we’ve seen too many California installs where a box-store generic corroded through in four years because the alloy mix couldn’t handle the salt air near the coast or the thermal cycling in the Central Valley. When Cole Drummond specs a replacement, he matches the original gauge and finish, period.

Signs Your IKO Flashing Replacement Is Failing

• Water stains on interior ceilings or walls below roof penetrations. This usually means the step flashing has lifted or the sealant bed has dried out, letting water run behind the metal instead of over it. On IKO Cambridge installs from the mid-2000s, we’ve found the factory sealant can crystallize faster in California’s low-humidity inland zones.
• Rust streaks running down siding or brick below chimney or wall intersections. The galvanized coating has failed, often at a bend point where the metal was overworked during original installation. Once rust starts, the flashing is eating itself from the inside out.
• Lifted or buckled shingles at the valley or wall line. The flashing underneath has shifted or corroded through, no longer providing a flat nailing surface. This creates a ripple that worsens with every heat cycle.
• Daylight visible from the attic at chimney or vent intersections. The counterflashing has separated from the masonry or the base flashing has pulled free of the deck. In California’s earthquake country, even minor settling can break a rigid flashing seal.
• Granule buildup in gutters below flashing joints. Shingles are working against a loose or misaligned flashing edge, abrading themselves every time the wind picks up. This accelerates the failure of both the flashing and the surrounding IKO field shingles.

Replacement Cost & What’s Included

Our IKO flashing replacement pricing breaks down as follows:

• Step flashing (per linear foot): $18-$28 installed
• Chimney saddle/cricket replacement: $340-$520
• Pipe vent flashing (standard 1.5″-3″): $140-$220
• Skylight perimeter flashing kit: $380-$560
• Wall-to-roof counterflashing (per linear foot): $22-$34

What drives the range is access difficulty, whether we need to remove and reset surrounding IKO shingles, and if the underlying deck has taken moisture damage. We quote upfront, and the number on the estimate is the number on the invoice. Every flashing replacement carries our 90-Day Done Right Promise, no paperwork, no arguing. If water finds a path we missed, we come back and make it right.

DIY or Call Us?

There’s a safe middle ground here. A homeowner can check the attic for daylight, note where stains appear, and clear debris from the roof edge with a blower. That’s useful intelligence, and we appreciate it.

What we don’t recommend is pulling shingles, bending metal, or working around chimneys without proper fall protection. California’s Title 8 safety standards apply to anyone on a roof, homeowner or not, and a 12-foot fall onto concrete or landscaping changes everything. Flashing work also requires integrating with the existing IKO system without disturbing the warranty-eligible installation pattern. We’ve been called in after DIY attempts that saved $200 and cost $800 in shingle replacement. If you’re unsure, call us at (877) 367-1429. We’ll look at it, tell you what we see, and quote honestly.

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