Tamko Flashing Replacement Nationwide

Tamko Flashing Replacement: The San Antonio Owner’s Guide

Tamko flashing replacement in San Antonio typically costs $350 to $900 installed, depending on how many linear feet are failing and whether we’re dealing with step flashing, pipe boot flashing, or valley flashing. We stock Tamko-compatible flashing and matched color options on our trucks, so in most cases we can complete the job the day we diagnose it. That said, flashing is a part most homeowners never think about until water shows up somewhere it shouldn’t be: a stain spreading across the ceiling, paint bubbling near a dormer, or damp insulation in the attic after a Hill Country thunderstorm rolls through.

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Here’s the important part: flashing failure isn’t a roof failure yet. When the metal that seals the joints between your shingles and anything that pokes through your roof (chimneys, skylights, vent pipes, walls) starts to corrode or lift, you typically have weeks to act before real decking damage sets in. But Texas sun is rough on flashing. The heat on a San Antonio summer roof can exceed 160 degrees, and that constant expansion and contraction is what eventually breaks the seal. Grant Whitlock has seen this exact failure on homes all over Alamo Heights, where older roof lines and original flashing make this a more common repair than most homeowners expect.

Key Takeaways

• We stock Tamko-compatible flashing in multiple profiles and colors on the truck.
• Installed replacement runs $350 to $900 for most San Antonio homes.
• Flashing fails before shingles fail in roughly 7 out of 10 cases we see.
• Every replacement includes a written quote before work starts and a 365-day written guarantee.

Mercer Roofing Co San Antonio is an independent roofing contractor and is not affiliated with or endorsed by Tamko Building Products. We install and replace Tamko roofing components as part of our full roofing services.

Which Tamko Models This Applies To

Tamko flashing is matched to the shingle line and roof profile, not to a single “model number” the way an appliance part would be. We work on homes with Tamko Heritage, Elite Glass-Seal, and Titan XT shingles, and the flashing we replace is typically the galvanized steel or aluminum step flashing, valley flashing, or pipe boot flashing that interfaces with those shingles.

The gotcha most San Antonio homeowners run into: Tamko’s color-matched flashing is not interchangeable across every product line. Heritage shingles in Weathered Wood use a different flashing color code than Elite Glass-Seal in the same name because the granule blends differ slightly. If you have the original shingle wrapper with the color code (usually a three or four digit code printed on the bundle label), we can match it precisely. If not, we’ll pull a shingle sample from an inconspicuous spot and match it that way.

On the OEM versus aftermarket question: for step flashing, a quality 26-gauge galvanized steel flashing from a reputable manufacturer performs just as well as Tamko-branded flashing, because the metal spec is the industry standard. For pipe boot flashing and specialty valley flashing, we prefer OEM or direct equivalents sized to Tamko’s shingle profile. The difference matters more on high-slope roofs and homes with multiple roof penetrations, which we see often in older San Antonio neighborhoods like Monte Vista and Olmos Park.

Signs Your Tamko Flashing Replacement Is Failing

• Water stains on ceilings or walls below roof transitions. This is the symptom we hear about most, and it almost always traces back to step flashing that has pulled away from the wall or rusted through at the nail line.
• Visible rust or corrosion on exposed flashing. Galvanized flashing has a coating that eventually breaks down, especially on south-facing roof slopes in San Antonio heat. Once rust bleeds down the shingle, the metal is done.
• Lifted or buckled shingles near chimneys and walls. When flashing loses its seal, the shingles it was protecting start to move. Wind-driven rain then gets underneath.
• Granule loss concentrated around roof penetrations. A vent pipe or skylight that leaks slowly will cause accelerated shingle wear in a circular pattern around the penetration. The flashing is usually the source.
• Daylight visible from the attic at roof intersections. If you can see light coming through where the roof meets a wall or dormer, the flashing gap is already open. Water is getting in during the next hard rain.

Replacement Cost & What’s Included

Here’s what we charge in San Antonio, and I’ll be straight about the range because the variables are real. Step flashing replacement on a single wall-roof intersection typically runs $350 to $550. Replacing a pipe boot flashing vent collar runs $250 to $400. Valley flashing replacement runs $500 to $900 depending on valley length and whether we need to lift and reset shingles on both sides.

What drives the price: accessibility (dormers and second-story work cost more), how much shingle lifting is required, and whether the underlying underlayment is still sound. Every quote includes the flashing material, roofing sealant, any necessary shingle reset, and haul-away of the old flashing. You get a written line-item price before any work begins, and the workmanship is covered by our 365-Day Done Right Promise: if it’s not right within a year, we make it right at no charge.

DIY or Call Us?

You can safely do a visual inspection from the ground or from a ladder (not the roof itself) and check for rust streaks, missing nail heads, or daylight at the soffit line. What you shouldn’t do is attempt the replacement yourself. Flashing work requires removing shingles without cracking them, re-nailing into the wall sheathing at the right intervals, and re-sealing the intersection so it holds through a Texas storm. One mis-set nail and you’ve turned a $500 flashing job into a $3,000 decking repair.

There’s also the safety factor. Roof work on a two-story San Antonio home is genuinely dangerous, especially after morning dew or during our humid months when shingles get slick. Our technicians are background-checked, identity-verified, and arrive in uniform with a photo ID badge. You’ll know the technician’s name and see their photo before they ever step on the property. If you’d rather not climb a ladder to inspect, call us at (254) 276-4369 and we’ll do the inspection for free as part of the estimate.

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