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Tamko Home Additions & ADU: The Fort Worth Owner’s Guide
A Tamko home addition or ADU project in Fort Worth typically runs $45,000 to $130,000 for a full build-out, with ADU construction landing between $90,000 and $220,000 depending on square footage, foundation work, and utility connections. We inspect, scope, and build Tamko-specified additions and accessory dwelling units from slab to finish, and most initial assessments can be scheduled within a few business days. The reality most Fort Worth homeowners face is this: an addition that was framed or flashed wrong shows up years later as a water stain on the ceiling, a door that won’t square, or a roofline that sags where it ties into the existing structure. By the time the failure is visible, the fix usually involves more than a tube of caulk.
If your Tamko-specified addition is showing signs of failure, the problem is rarely the materials. It’s the tie-in. The point where old framing meets new, where roof sheathing transitions, where flashing should have been lapped correctly. That junction is where Fort Worth’s weather does its work.
Which Tamko Models This Applies To
Tamko’s product line doesn’t extend to full structural framing systems, so when we talk about Tamko home additions and ADUs in Fort Worth, we’re talking about the building envelope: Tamko roofing and underlayment products specified on addition roofs, Tamko waterproofing membranes at the foundation line, and Tamko flashing details at the roofline tie-in. If your addition or ADU was built with Tamko shingles, Tamko Deck-Armor underlayment, or Tamko TW-60 self-adhered membrane, this page is for you.
The compatibility gotcha we see on Fort Worth addition projects is underlayment mismatch. A roof system spec’d with Tamko Deck-Armor performs differently than one built on standard #30 felt. When a repair crew patches a roof without matching the underlayment, the nail line performance changes and you get premature wear around the patch. If the original build included Tamko TW-60 at the eave-to-wall transitions, the replacement needs the same self-adhered product, not a bargain roll of peel-and-stick from a big-box shelf.
On the ADU side, Tamko products show up most often at the roof deck and the foundation waterproofing. The critical spec is the membrane thickness and adhesion rating at the sill plate. A Tamko-spec’d ADU in Fort Worth has a documented materials list from the builder. If you don’t have that list, we’ll match it from the tear-off inspection.
Quick note on sourcing: Bradford Remodeling Co Fort Worth is an independent contracting company. We’re not affiliated with Tamko, but we specify and install Tamko products on additions and ADU projects where the original scope calls for them, and we keep Tamko-compatible membrane, flashing, and underlayment options on the truck for repair work.
Styles & brands we work with
Signs Your Tamko Home Addition or ADU Is Failing
Additions fail in predictable ways. Here’s what Fort Worth homeowners call us about most, and what’s actually happening behind the drywall:
- Water staining at the addition’s roofline tie-in. This is almost always flashing that was under-lapped or skipped entirely at the transition between the original roof and the addition roof. Fort Worth’s summer storms drive rain sideways, and that junction catches it all.
- Doors that stick or won’t latch in the addition. The foundation under the addition is settling at a different rate than the original slab. This is common in Fort Worth’s clay soils, and it means the addition wasn’t isolated with the right expansion joint or the soil wasn’t compacted to spec.
- Mold smell or damp drywall at the base of the ADU walls. The sill plate waterproofing has failed or was never installed with a self-adhered membrane. Moisture wicks up from the slab edge and saturates the bottom plate.
- Roof decking that feels soft when you walk the addition roof. This points to a Tamko underlayment issue. Deck-Armor is a breathable product; if it’s installed over a deck that’s already holding moisture, the deck rots underneath while the underlayment looks fine from above.
- Separation cracks at the addition wall-to-ceiling junction. The addition framing is moving independently of the original structure. Proper tie-in brackets and shear connections were either omitted or under-specified. In Fort Worth, where we get hard freezes and 100-degree stretches in the same year, that movement never stops on its own.
Replacement Cost & What’s Included
If the failure is in the envelope materials, a Tamko-compatible roof replacement or membrane repair on a Fort Worth addition runs $8,000 to $20,000 for the roof scope alone, depending on square footage and how much decking needs to come out. Full addition rebuilds, where framing, sheathing, and enclosure all need correction, land in the $45,000 to $130,000 range. ADU envelope work typically runs $30,000 to $80,000 when the structure is sound but the waterproofing and roof system need a full redo.
| Scope of Work | Fort Worth Price Range |
|---|---|
| Full Home Addition (framing to finish) | $45,000 – $130,000 |
| ADU Construction (full build) | $90,000 – $220,000 |
| Garage Conversion to Living Space | $30,000 – $80,000 |
| Addition Roof Replacement (Tamko-spec) | $8,000 – $20,000 |
| Foundation Waterproofing Membrane Replacement | $3,500 – $9,000 |
Our written price includes the tear-off, disposal, any decking replacement, Tamko-compatible materials matched to the original spec, new flashing at every transition, and the final walkthrough with a signed scope in your hand. Every addition and ADU repair we complete in Fort Worth carries the 365-Day Done Right Promise: if the work fails within one year of completion, we return and correct it at no charge. That’s in writing before the first tool comes out.
See the difference
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AfterDIY or Call Us?
You can check the obvious things yourself: look at the roofline tie-in from the ground with binoculars, check for daylight at the wall-to-ceiling junctions in the addition, and feel the drywall at the base of ADU walls for dampness. That tells you whether you need an inspection. What you should not do is get on the addition roof. The slope at the tie-in is where Fort Worth homeowners get hurt, and if the decking is soft, the risk of a fall goes up fast. Flashing correction and membrane replacement on an addition roof isn’t a weekend caulk-and-paint job. It requires cutting back existing roofing, lapping materials to spec, and making sure the transition drains before your next storm. The Garrison Standard means we write the scope, we set the price, and we fix it right the first time. That beats a second repair call in six months.
If you’re seeing water stains, sticking doors, or cracks at the ceiling line in your Tamko-spec’d addition or ADU, call (682) 204-4897. We’ll get someone out to look, write you a line-item scope, and hand you a firm number before you spend a dollar.
FAQs
A properly installed Tamko architectural shingle roof on a Fort Worth addition should last 20 to 30 years, but the flashing at the tie-in points typically needs attention around the 10 to 15-year mark. The shingles can be fine while the flashing fails. That’s why we inspect transitions first.
Yes, if the damage is isolated to a flashing detail or a small section of decking, a targeted repair runs $400 to $1,800 in Fort Worth. The catch is matching the underlayment and shingle lot, and making sure the repair doesn’t create a new weak point at the seam. Call (682) 204-4897 and we’ll tell you straight whether the scope is a repair or a replacement.
Most addition roof replacements in Fort Worth take two to four working days once materials are on site, weather permitting. If decking replacement is involved, add a day. We leave the site clean, the dumpster gone, and the written guarantee in your hand at the final walkthrough.
Our Fort Worth crews carry Tamko-compatible flashing, underlayment, and self-adhered membrane for repair scopes, along with standard roof accessories. Anything beyond that is ordered against the written scope before the job starts, so there’s no mid-project surprise on materials. We also work with documented brands like James Hardie, GAF, and Owens Corning when the project calls for it.
Get Your Addition or ADU Scope in Writing
Straight scope, firm price, no surprises at final walkthrough. That’s how Curtis Lane runs every Bradford Remodeling Co Fort Worth job. If your Tamko-spec’d addition or ADU is showing signs of failure, don’t wait for the next rain to make the decision for you. Call (682) 204-4897 to schedule an inspection and get a written price before any work starts. Part of the Garrison Partners family since 2004, held to The Garrison Standard on every job we run in Fort Worth.
Written by Curtis Lane, Owner, Bradford Remodeling Co Fort Worth at Bradford Remodeling Co Fort Worth, serving Fort Worth and nearby areas.
