Metal roofing
Architectural shingles
Tile roofing
GAF
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Owens Corning Flashing Replacement: The San Antonio Owner’s Guide
Owens Corning flashing replacement in San Antonio typically runs $350 to $900 installed, depending on which penetration is leaking and how much decking needs to come up. We stock Owens Corning-compatible flashing on our trucks and can usually swap a failed piece within a single visit. Most San Antonio homeowners discover the problem the way you probably did: a water stain on the ceiling after a hard Hill Country storm, or granules in the gutter that don’t match normal shingle wear.
The flashing is the metal that bridges the gap between your shingles and anything that pokes through the roof: chimneys, vent pipes, skylights, wall intersections. When it fails, water finds the hole fast. And in San Antonio, our freeze-thaw cycles and UV exposure age flashing differently than shingle manufacturers’ national averages predict. What lasts 20 years in Ohio might give you 12 to 15 here.
Which Owens Corning Models This Applies To
Owens Corning doesn’t sell flashing as a standalone branded product line the way they sell Duration or Oakridge shingles. Their roofing systems integrate with standard galvanized, aluminum, and copper flashing profiles. So when we say “Owens Corning flashing replacement,” we mean flashing that’s compatible with your Owens Corning roof system: Duration, Duration Storm, Oakridge, or Woodmoor shingles over the appropriate underlayment, with flashing gauges matched to the shingle profile’s exposure and thickness.
The compatibility gotcha most homeowners hit: Owens Corning Duration shingles are thicker than standard three-tab, which means the step flashing needs a taller vertical leg to sit flush against the shingle’s butt edge. If a previous roofer used flashing cut for thinner shingles, you’ll get a lip that catches water instead of shedding it. We match the flashing gauge and leg height to your specific Owens Corning shingle profile. OEM versus aftermarket isn’t really a debate here: Owens Corning doesn’t stamp flashing with their name, so what matters is gauge (we spec 24-gauge or heavier for most San Antonio penetrations), finish (galvanized, galvalume, or copper), and whether the installer actually knows how your shingle profile interacts with it.
Styles & brands we work with
Signs Your Owens Corning Flashing Replacement Is Failing
- Water staining on ceilings or walls after rain. This is the classic tell. Flashing fails at the seam or the sealant bead ages out, and water tracks along rafters before showing up somewhere you can see. That’s why the stain rarely lines up directly under the actual leak.
- Granule loss concentrated around a chimney or vent pipe. Shingles near a failed flashing point get saturated, and saturated asphalt sheds granules faster. If your gutters show heavy granule buildup below a penetration, start looking up.
- Visible rust or corrosion on exposed flashing. In San Antonio, salt-laden air from the Gulf combined with our humidity accelerates corrosion on galvanized flashing. Once rust scales through, water has a direct path under the shingles.
- Lifted or curling flashing edges. The sealant that bonds flashing to the shingle and penetration ages out, especially under intense San Antonio UV exposure. When the metal lip lifts, wind-driven rain gets driven right underneath it.
- Daylight visible from the attic around chimneys or vents. This is the one you can check yourself without getting on a ladder that’s teetering on uneven ground. If light comes through, water is coming through too.
Replacement Cost & What’s Included
In San Antonio, here’s what Owens Corning-compatible flashing replacement runs, installed:
- Pipe boot / vent pipe flashing: $350 – $550
- Chimney step and counter-flashing: $550 – $900
- Skylight flashing replacement: $500 – $850
- Wall/step flashing along a dormer or sidewall: $450 – $800
What drives the range: how many courses of shingles we need to lift, whether the decking underneath is rotted, and how tall the chimney or penetration sits from the eave. Every quote includes the flashing material, replacement underlayment where needed, re-securing the shingles, and haul-off of the old metal. You get a written price before we start. Every repair is covered by our 365-Day Done Right Promise, which means if that flashing leaks within a year, we come back and fix it at no charge. No negotiation, no runaround, no “that must have been a different leak.”
See the difference
Before
After
Before
After
Before
AfterDIY or Call Us?
You can safely check for flashing failure from the attic with a flashlight: look for daylight at penetrations, damp decking, or water stains. You can also check exposed flashing from the ground with binoculars. What you shouldn’t do is climb a San Antonio roof with a caulking gun and a YouTube tutorial. Flashing replacement means lifting shingles without cracking them, properly layering step flashing with each course, and knowing when the decking underneath has gone too soft to hold a nail. Get it wrong and you’ve traded an $800 flashing fix for a $4,000 decking replacement plus interior drywall work. If you can see rust, daylight, or staining, call us at (361) 209-8857, and we’ll put a written price in your hand before anything gets removed.
FAQs
In San Antonio’s climate, expect 12 to 20 years from galvanized flashing before corrosion or sealant failure forces replacement. Copper flashing can last 40-plus years, but it’s rarely original equipment. The shingles themselves often outlast the flashing, which is why flashing replacement is a standard mid-life repair on Owens Corning roofs in our area. Call (361) 209-8857 for an inspection and exact quote.
Sometimes, but only if the failure is limited to the sealant bead at the top of the flashing. If the metal itself is rusted through, lifted, or separated at a seam, patching it is a temporary fix that usually fails within a season. We’ll tell you honestly which one you have. Estimates are free at (361) 209-8857.
Most single-penetration flashing replacements take 2 to 4 hours from setup to cleanup. Chimney and sidewall flashing with multiple courses is usually a half-day. You’ll get a live arrival time before we show up, plus before-and-after photos so you can see exactly what was replaced. Call (361) 209-8857 to schedule.
Yes. Our San Antonio crews carry 24-gauge galvanized pipe boots, step flashing in multiple heights, and counter-flashing profiles that work with Owens Corning Duration, Oakridge, and Woodmoor shingle systems. We also work with GAF and CertainTeed systems if your roof has a partial reroof mix. If we need a specialty copper or lead-coated copper piece, we can usually source it same day.
Get Your Owens Corning Flashing Replaced in San Antonio
If you’ve got a stain, a rust patch, or daylight where there shouldn’t be any, don’t wait for the next storm to name the leak. Every flashing replacement we do includes a written price before work starts, photo documentation, and the 365-Day Done Right Promise in writing. Dylan Pace and the Crestview Roofing team serve homeowners throughout San Antonio, from Alamo Heights to Leon Valley to Stone Oak. Call (361) 209-8857 for a free estimate.
Written by Dylan Pace, Owner, Crestview Roofing Co San Antonio at Crestview Roofing Co San Antonio, serving San Antonio and nearby areas.