Tamko Flashing Replacement in San Antonio, TX

Tamko Flashing Replacement: The San Antonio Owner’s Guide

We stock and install Tamko-compatible flashing replacement across San Antonio, with most residential jobs running $285-$520 installed depending on linear footage, roof pitch, and whether we’re matching existing Tamko Heritage or Titan XT profiles. Same-day service is available when you call before noon, and our trucks carry the common Tamko widths and colors that match roofs we see in neighborhoods from Alamo Heights to Stone Oak. Most San Antonio homeowners discover their flashing has failed after a hard rain leaves water stains on ceiling corners, or when they spot rust streaks running down the fascia during our humid spring months.

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Which Tamko Models This Applies To

Tamko flashing isn’t one-size-fits-all. The Heritage series uses a 26-gauge galvanized step flashing with a specific 4-by-7-inch profile that interlocks differently than standard 3-by-4-inch generic stock. Titan XT systems, common on homes built after 2018 in Bexar County, require a slightly heavier 28-gauge pre-finished steel to match the thicker shingle exposure. If you’re trying to identify what you’ve got, check the underside of any lifted shingle near a wall or chimney - Tamko stamps a small “T” logo and gauge marking on the exposed edge of OEM flashing, usually within the first two inches.

We carry both genuine Tamko flashing and a quality aftermarket equivalent made to the same gauge and bend spec. The aftermarket saves roughly $40-$60 on material cost and carries the same 20-year corrosion warranty in South Texas conditions. The catch: color matching. Tamko’s Weathered Wood and Rustic Slate finishes have shifted slightly across production years, and a 2019 Heritage roof in San Antonio’s full sun can look two shades different from fresh stock. We always bring color samples to the roofline before cutting anything. Ridgeline Roofing Co. of San Antonio is an independent service provider - not affiliated with Tamko - so we’ll tell you straight when aftermarket makes sense and when OEM is worth the extra cost.

Signs Your Tamko Flashing Replacement Is Failing

• Water stains on interior ceiling corners or wall joints. This is the most common call we get after a San Antonio gully-washer. The flashing’s seal has separated from the masonry or siding, letting water track behind the metal and into the decking. The stain pattern usually follows the roof slope downward from the penetration point.
• Rust streaks or orange discoloration on fascia boards or siding below wall intersections. Galvanized flashing in our climate faces 70-plus days a year above 95 degrees, which accelerates the breakdown of the protective zinc layer. Once rust starts at the bend points where water pools, replacement is the only fix - coating over it buys months, not years.
• Lifted or curled shingles at wall abutments. When step flashing pulls loose from the wall, shingles lose their anchoring lip and begin to curl from wind uplift. We see this especially on north-facing walls in Terrell Hills and Olmos Park, where morning moisture lingers and weakens the seal.
• Visible gaps between counter-flashing and brick or stucco. The top edge of Tamko counter-flashing should sit tight in a reglet joint or behind a stucco lip. Gaps here mean the metal has worked loose from thermal cycling - San Antonio’s 40-degree temperature swings in spring are hard on expansion joints.
• Granule accumulation in gutters below valleys or wall joints. This signals water is running backward under the flashing edge, washing shingle granules into the gutter. It’s often the first physical clue before any interior damage shows, and it means the flashing’s downhill leg has lost its pitch or seal.

Replacement Cost & What’s Included

What drives the range: roof pitch above 6/12 adds labor time for safety setup; stucco or masonry walls require careful reglet cutting that siding jobs don’t; and the extent of hidden decking damage only reveals itself after we pull the old metal. Our estimate includes removal, disposal, new flashing cut and formed on-site, ice-and-water shield at critical joints, and shingle reintegration. Every flashing job carries our 90-Day Done Right Promise - if water gets past our work, we come back and make it right, no paperwork war. The number we quote is the number on the invoice.

DIY or Call Us?

There’s a short list of what a homeowner can safely check from a ladder or the ground. Confirm the stain location matches a roof penetration. Look for obvious gaps or rust you can photograph. Check that gutters aren’t clogged and backing water uphill. That’s about where sensible DIY ends.

Flashing replacement means working at roof-wall intersections where footing is awkward, sealants must bond in the right sequence, and one misaligned piece becomes a funnel instead of a shield. The metal itself is sharp, and old galvanized edges slice worse than new. More importantly, improper flashing installation voids most shingle warranties - Tamko’s system warranty specifically requires “factory-authorized or equivalent installation methods.” We’ve been called to fix homeowner flashing jobs in Castle Hills and Monte Vista where the repair cost tripled because water had months to rot decking. If you’re unsure, call us at (833) 756-5022. We’ll give you a straight assessment, and there’s no charge for the look.

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