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Tamko Home Additions & ADU: The Houston Owner’s Guide
A full home addition or ADU built with Tamko roofing and weatherproofing products in Houston typically runs $45,000 – $130,000 installed, depending on square footage, foundation work, and whether the space ties into existing HVAC and plumbing. We stock and install Tamko-compatible roofing, underlayment, and flashing components for additions and accessory dwelling units across Houston, and most material match-ups can be confirmed from a photo before we send a crew. The usual call starts something like this: a homeowner spots water staining on the ceiling where the new addition ties into the main roofline, or they find shingle granules washing into the gutter after a hard Houston storm.
What most people discover is that the failure isn’t always the shingle itself. It’s the transition flashing, the underlayment seam, or a ventilation detail that was never tuned for our humidity. Tamko makes solid products, but an addition is only as dry as its junctions. We see it in Meyerland, Kingwood, and Katy every storm season.
Which Tamko Models This Applies To
The Tamko product lines that matter for a Houston home addition or ADU break into three groups: Heritage shingles (the classic architectural laminated line), Titan XT (their heavier, high-wind rated option), and their Elite Glass-Seal and TW series for flat or low-slope sections, which are common on modern ADU designs. Each has different nail patterns, exposure, and flashing requirements, and mixing them across a single roof plane causes exactly the leaks owners call us about.
Here’s the compatibility gotcha most homeowners miss: Tamko’s low-slope products require a different underlayment spec than the pitched sections of the same roof. If your ADU has a shed roof at a 3:12 pitch or lower, the roofer should have used a specific self-adhered membrane, not standard felt or synthetic. We check this on every Tamko addition we inspect. If you’re not sure which product was installed, look inside the attic for the wrapper labels, or check the permit documents from the original build. We can also identify most Tamko lines from a clear photo of the shingle edge and color blend.
For the OEM versus aftermarket decision: flashing, ridge cap, and hip components should be Tamko brand or a direct spec match, not generic. Ventilation products, like ridge vents and intake vents, can be quality aftermarket equivalents if they meet the square footage ventilation calculation for that specific roof. On a Houston addition, we tend to over-spec ventilation slightly because our attic temperatures in July do not reward a bare-minimum install.
Styles & brands we work with
Signs Your Tamko Home Additions & ADU Is Failing
- Water staining along the addition’s tie-in line. The junction where the new roof meets the original house is the most common failure point, usually because the step flashing wasn’t layered correctly or the shingles weren’t interwoven. This leak shows up after sustained rain, not a quick shower.
- Shingle granules collecting in gutters at the addition’s downspouts. Granule loss means the asphalt layer is deteriorating. On a newer Tamko roof, this often points to manufacturing inconsistency or hail damage, not age.
- Roof decking feels spongy or sags at the low edge of the ADU. In Houston humidity, a poorly ventilated low-slope section traps moisture from the inside, softening the OSB or plywood deck. You’ll see this before you see an interior leak.
- Flashing lifting at the chimney, dormer, or mechanical penetrations. Tamko shingles don’t fail at the field first; the edges do. Lifted flashing lets wind-driven rain walk sideways under the shingles during squall lines.
- Nails backing out or visible through shingle tabs on the addition. Thermal expansion and contraction in Houston’s hot-cold-humid cycle works nails loose over time. If you can spot nail heads from the ground, water has already found a path.
Any one of these is worth a closer look before the next downpour. Two or more means the addition needs real remediation, not caulk.
See the difference
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AfterReplacement Cost & What’s Included
For a Tamko-spec addition or ADU roof in Houston, the installed ranges break down by job type:
- Home addition (full roof, tie-ins, flashing): $45,000 – $130,000, including framing, decking repair, and weatherproofing
- ADU construction (standalone, complete build): $90,000 – $220,000, with Tamko roofing scoped and specified
- Garage conversion with new roofline: $30,000 – $80,000
- Roof replacement on existing addition: $8,000 – $20,000, depending on square footage and decking condition
What drives the range is not mystery pricing. It’s whether the existing decking is sound, how complex the tie-in geometry is, whether the low-slope sections need a different Tamko product spec, and what ventilation corrections are required. We give a written price before any work starts, and that number does not move at the door. Every completed job carries the 365-Day Done Right Promise: if the work fails within a year, we come back and correct it at no charge. That guarantee is in writing, in your hand, at job close.
DIY or Call Us?
You can safely check a few things yourself: inspect the attic for water staining after a rain, look at the shingle edges from the ground for lifting, and clear debris from roof junctions you can reach from a ladder. That’s useful information for us.
What you should not do is get on a two-story addition roof in Houston, especially after everything’s been baking in the sun. Tamko shingles get slick with moisture in the morning and soft in the afternoon heat. Walking a roof you’re not trained to read does more damage than good, and a fall off a second-story ADU roofline is a life-changing injury, not a weekend project. The dangerous part on these jobs isn’t the shingle, it’s the height, the pitch, and the false confidence of a dry afternoon. We’d rather come out and assess it for you. Call (940) 289-7658 and we’ll put eyes on it.
FAQs
How long should a Tamko roof last on a Houston addition?
A properly installed Tamko Heritage or Titan XT roof on a Houston addition should last 20 – 30 years, but our humidity, hail events, and attic heat routinely knock several years off that number if ventilation wasn’t speced correctly. The underlayment and flashing typically fail before the shingles do, which is why we inspect the junctions first. If your addition is approaching 15 years old, a professional inspection will tell you more than the warranty paperwork will. Call (940) 289-7658 to schedule a look.
Can a failing Tamko roof section be repaired instead of replaced?
Yes, if the failure is localized, flashing at a single penetration, a torn shingle, or a ventilation correction. If the underlayment is compromised across a wide area or the decking is soft, patching buys you a season, not a solution. We’ll tell you which one you’re looking at before we quote anything, and the quote is a written number either way. We don’t sell replacements where a repair is honest work.
How long does a Tamko addition roof repair or replacement take?
A flashing repair or localized fix on a Tamko addition roof in Houston takes one crew one day in most cases. A full tear-off and replacement on a large addition or ADU runs two to four days, depending on weather and decking surprises. We give you a schedule in writing before the crew arrives, and background-checked, uniformed technicians show up when we say they will.
Do you stock Tamko materials, or do you order them?
We keep common Tamko flashing, underlayment, ridge cap, and sealant products on our Houston trucks for scheduled jobs, and we source full shingle orders direct from Tamko’s distribution network. If you’re matching an existing Tamko roof on an addition, we’ll confirm the exact color and product line before ordering so the blend is right. Call (940) 289-7658 and we’ll match what’s on your roof today.
Written by Curtis Lane, Owner, Bradford Remodeling Co Houston at Bradford Remodeling Co Houston, serving Houston and nearby areas.
