CertainTeed Flashing Replacement Nationwide

CertainTeed Flashing Replacement: The San Antonio Owner’s Guide

CertainTeed flashing replacement in San Antonio typically costs $380 to $950 installed, depending on the flashing type, roof pitch, and how much underlying material needs to be pulled back. We keep common CertainTeed-compatible flashing profiles stocked in our San Antonio shop, and most flashing replacements are completed in a single visit. Most homeowners discover flashing has failed after a hard Hill Country storm pushes water where it shouldn’t go, or when they spot a rust line bleeding down siding from a valley intersection. Flashing is the quiet metal that sits at every seam, wall joint, and chimney base on your roof. When it fails, water follows with surprising speed.

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Key Takeaways:

• Installed flashing replacement in San Antonio runs roughly $380 to $950 for most homes.
• We match CertainTeed shingle profiles with the correct flashing gauge and profile, not universal aftermarket stock.
• Every replacement includes a written price before work starts and a 365-day written guarantee.
• Your technician’s name and photo are sent before arrival, and they’ll badge in at the door.

Which CertainTeed Models This Applies To

Flashing is not model-specific the way a shingle color is, but it does need to match the shingle profile you already have. CertainTeed’s most common architectural lines in San Antonio, Landmark, Landmark Pro, and Northgate, use a dimensional shingle thickness that standard step flashing accommodates without issue. Where owners get into trouble is with CertainTeed’s thicker designer profiles like Presidential Shake and Grand Manor. These carry a heavier reveal, and the step flashing needs to be cut longer than what a big-box store flash roll provides. If someone installed generic 4-inch flashing under a Presidential Shake roof, water often climbs the seam after one good San Antonio gulley-washer.

We install OEM CertainTeed flashing components when a warranty claim or a commercial property requires that documentation. For most San Antonio homes, we use gauge-matched metal from a Texas supplier that meets or exceeds the OEM spec, at a lower price than the CertainTeed-branded part. The metal itself is galvanized steel or aluminum, depending on the flashing location. We’ll show you the difference before any work begins. If you have a CertainTeed warranty in place, we’ll confirm whether the flashing needs to be OEM to keep that warranty valid. That question alone has saved San Antonio owners thousands.

Signs Your CertainTeed Flashing Replacement Is Failing

• Water stains on interior ceilings near an exterior wall. This is the classic symptom of failed step flashing at the roof-to-wall meeting point. The wall flashing is often fine while the step flashing underneath has rusted through or lifted. In San Antonio’s clay-soil homes, this stain often appears near the fireplace wall first.
• Rust-colored drip lines down siding or brick below a valley. Galvanized flashing has corroded and is shedding oxide into the runoff. The water now runs behind the flashing instead of over it, and the stain is the evidence of the metal’s last gasp.
• Grit or shingle granules collecting in a gutter under a valley. Flashing failure often accelerates shingle decay at the valley’s edge. The constant moisture wicks under the shingle and breaks down the mat, leaving a telltale pile of granules in that one spot.
• Flashing that visibly lifts away from a chimney or skylight when the sun hits it. Thermal cycling in San Antonio heat expands and contracts metal. After enough 100-degree days, old flashing loses its bond to the sealant and begins to pull away from masonry. You may see daylight through the gap from the ground with binoculars.
• Dark, damp soil or water pooling inside an attic knee wall after rain. This points to failed apron flashing at a dormer or wall-to-roof junction. The water tracks down inside the wall cavity before it ever shows as a ceiling stain.

Replacement Cost & What’s Included

Here’s what flashing replacement costs in San Antonio when we do it, in real numbers:

• Step flashing replacement (one wall-to-roof run): $380 to $650
• Chimney flash replacement (counter flash plus apron and step flash): $650 to $1,100
• Valley flashing replacement (one valley): $450 to $800
• Pipe boot or wall kick flashing replacement: $180 to $350

What drives the range: roof pitch (steep roofs cost more because of safety equipment and slower work), accessibility, current metal condition beneath the flashing you can’t see, and whether we need to reroof a small section of shingles to do the job right. The quote we give is the price you pay. No change orders, no add-ons when we discover hidden damage unless we discuss it with you first in real numbers. Every flashing replacement includes a written 365-day guarantee. If it leaks within the year, we come back and fix it without charging you for the second visit.

DIY or Call Us?

What you can safely do yourself: get eyes on the flashing from the ground with binoculars, check your attic after a rain for active water tracks, and clear debris from valleys. That’s where the DIY route should end, and here’s the honest reason: to replace flashing correctly, shingles have to come off, old flashing has to come out, and new flashing has to be woven back into the shingle courses the way CertainTeed’s installation spec requires. One wrong step on the re-lay and you’ve traded a flashing leak for a bigger one you just installed yourself. Plus, working on a roof in San Antonio means working on a surface that bakes past 140 degrees in summer. That’s a fast track to a bad fall. We’d rather you call us than have you on a ladder with a pry bar. Call (254) 276-4369 and we’ll put eyes on it from the roof instead of the ground.

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