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Tamko Home Additions & ADU: The Austin Owner’s Guide
If you’re searching for Tamko home addition and ADU parts in Austin, you’re likely dealing with a failed flashing detail, a torn underlayment seam, or damaged exterior trim on an existing addition. Typical installed repair costs range from $45000 to $130000 for a full addition, though targeted parts replacement on a Tamko-built structure usually falls between $400 and $1,800 depending on what failed. Most owners discover the issue after a storm blows through, when water stains show up on the ceiling or drywall near the roofline where the addition ties into the main house.
The most common failure point on Tamko additions we see across Austin isn’t the framing or the sheathing. It’s the transition flashing where the new roofline meets the original structure, plus the underlayment edges that lift after a few Texas freeze-thaw cycles. We stock Tamko-compatible flashing, underlayment, and exterior trim parts on our trucks so we can usually handle the fix in a single visit.
Which Tamko Models This Applies To
Tamko’s product line for additions and ADUs covers several series, and the parts aren’t always interchangeable. The Heritage and Titan XT series use different underlayment weights and flashing profiles than the older Proline series. If your addition was built after 2019, it likely has Tamko’s self-adhered Ice & Rain guard at the roof-to-wall transition, which is a specific product width you won’t find at a big-box store.
Here’s the compatibility gotcha most Austin owners miss: the flashing profile has to match the shingle exposure, not just the shingle brand. A Tamko Heritage shingle exposes 5 5/8 inches, while Titan XT exposes 5 inches. If the step flashing was cut for the wrong exposure, water wicks behind it and rots the wall sheathing slowly, often over two or three years before you see it inside. We verify the exposure measurement before ordering any flashing part.
On the OEM versus aftermarket decision: for underlayment and sealants, quality aftermarket equivalents from GAF or Owens Corning work fine because the materials meet the same ASTM standards. For flashing and Tamko’s proprietary trim profiles, we recommend OEM parts. The aftermarket versions are close but rarely exact on the bend radius and lap geometry. Sawyer Remodel Austin is an independent service provider, not affiliated with Tamko, but we’ve installed enough of these additions to know which parts you don’t mess with.
Styles & brands we work with
Signs Your Tamko Home Additions & ADU Is Failing
- Water staining on interior ceilings near the roof-to-wall transition. The step flashing has either corroded at the nail line or was never lapped correctly. This is the number one call we get from Bouldin Creek and Travis Heights homeowners.
- Lifting or curling underlayment visible at the roof edge. Austin’s summer heat bakes the adhesive on older Tamko underlayment until it releases. Once it lifts, wind-driven rain gets underneath and finds the sheathing.
- Soft spots in the exterior wall sheathing below the roofline. Flashing isn’t shedding water away from the wall. By the time the drywall inside shows a stain, the sheathing has usually been wet for months.
- Visible gaps where the addition roofline meets the original house. The transition flashing has pulled away, usually after foundation movement. Austin clay soils expand and contract enough to separate flashing joints over a few seasons.
- Granule loss on Tamko shingles within the first five years. This points to a ventilation problem in the addition’s attic space, not a shingle defect. Heat builds up, cooks the shingles from underneath, and the granule coating sheds early.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a full Tamko-compatible home addition in Austin, installed costs run $45,000 to $130,000 depending on square footage, site prep, and whether you’re tying into existing plumbing and electrical. For an ADU, expect $90,000 to $220,000. For the parts-replacement side of the work, which is what this page is really about, flashing replacement typically runs $400 to $1,800, underlayment repair $600 to $2,500 for a partial section, and exterior trim replacement $500 to $2,000.
Every quote includes the part cost, labor, disposal of the old material, and our written price before any work starts. You approve the number, and that’s the number on the invoice. No change orders, no surprises. The work is covered by our 365-Day Done Right Promise: if it’s not done right, we make it right, in writing, on every project.
DIY or Call Us?
You can safely check a few things yourself. Look at the flashing from the ground with binoculars after a rain. Is water beading on the wall below the roofline instead of running off? Are there lifted shingle edges you can see from the curb? Those observations help us diagnose faster when you call.
What you shouldn’t do is get on a ladder and start prying flashing loose. The roofline on an addition sits at a steep angle, and the flashing is under tension at the lap joints. One wrong pry with a flat bar and you’ve compromised the waterproofing on a section that was still holding. If the part failed, there’s usually water damage hiding behind it that needs to be found and dried before any new part goes on. Call (409) 834-4854 and we’ll come take a look. The estimate is free.
FAQs
Tamko’s galvanized and aluminum flashing typically lasts 15 to 25 years in Austin, but the sealant at the lap joints fails sooner, usually around 8 to 12 years with our summer UV exposure. Call (409) 834-4854 for an inspection and a written quote, free.
Yes, if the metal is intact. We can strip the old sealant, clean the laps, and re-seal with a polyurethane sealant rated for Texas temperature swings. If the metal is corroded through or bent, replacement is the honest call because patch sealant over a hole is a temporary fix at best.
Flashing replacement on a typical Austin addition takes 4 to 6 hours. Underlayment repair can run a full day if we have to strip and re-lay a roof section. We’ll tell you the schedule before we start, and you’ll get photo updates as the work goes in.
We stock common Tamko-compatible flashing, underlayment, and sealants on our trucks. Proprietary trim profiles sometimes need a 2 to 3 day order. Either way, we confirm parts availability before we schedule the visit so you’re not waiting on a truck.
Ready to stop guessing and get a real number? Call Sawyer Remodel Austin at (409) 834-4854. Luca Romano and the crew will come out, find the actual problem, and hand you a written price before any work begins. Measure twice, cut once, then we actually build the thing.
Written by Luca Romano, Owner, Sawyer Remodel Austin at Sawyer Remodel Austin, serving Austin and nearby areas.
