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Therma-Tru Home Additions & ADU: The Jacksonville Owner’s Guide
Bradford Remodeling Co Jacksonville installs Therma-Tru entry doors, sidelights, and transoms in the $45,000 – $130,000 range for full home additions, with ADU projects typically running higher depending on scope. We keep common Therma-Tru replacement components on the truck for Jacksonville jobs: weatherstrip, sweeps, hinge shims, and astragals. Most door or frame failures tied to a home addition show up within the first two years of Florida’s humidity cycle, and we can usually diagnose the problem in one visit.
Most Jacksonville homeowners discover the issue when a Therma-Tru door that used to close tight suddenly fights them, or daylight shows around the frame after the addition settles. On the coast and along the St. Johns, salt air and summer moisture accelerate frame movement more than people expect.
Which Therma-Tru Models This Applies To
We work on Therma-Tru’s full residential line, including the Classic-Craft, Fiber-Classic, and Smooth-Star series, along with the Pulse and Benchmark door systems. The compatibility issue we see most often in Jacksonville: a homeowner buys a replacement threshold or sweep for a Classic-Craft, but the door is actually an older Fiber-Classic with different sill geometry. The part looks close at the hardware store, but it won’t seal correctly.
Here’s how to identify your door before calling us. Open the door and look at the hinge edge, about a foot up from the bottom. Therma-Tru stamps a small label there with the series name and sometimes the manufacture date. If the label is gone, measure the door slab thickness: Classic-Craft and Fiber-Classic are typically 1-3/4 inches. Smooth-Star runs the same thickness but has a different slab edge profile. Take a photo of the door edge and the existing weatherstrip before you call. It saves a trip.
OEM Therma-Tru parts matter on the sealing components: weatherstrip, sweeps, sill caps, and corner pads. Those parts have specific nailing flanges and interlock profiles that aftermarket generics often miss by a millimeter. On hardware like hinges and handle sets, quality aftermarket equivalents are usually fine, so long as they match the hinge prep pattern already routed into the slab.
Bradford Remodeling Co Jacksonville is an independent remodeler and installer. We’re not affiliated with Therma-Tru, but we’ve been specifying and installing their door systems on Jacksonville additions and ADUs long enough to know which parts interchange and which ones don’t. We carry the same brand discipline on cabinetry and surfaces: KraftMaid, Cambria, and Silestone are also in our documented material roster.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- Daylight visible around the latch side or top of the door. The addition’s framing has settled, or the jamb was shimmed incorrectly at rough-in. Fixing this often means pulling the casing and re-shimming the jamb, not just cranking the hinges.
- The sweep drags or leaves a visible gap at the threshold. Sill caps wear differently in Florida heat. A hardened or torn sweep lets conditioned air pour out and lets palmetto bugs in.
- Intermittent sticking after a heavy rain. This is a classic Jacksonville symptom: the slab’s wood frame swells, or the sill pan drains too slowly. We see it a lot on additions built over crawlspaces in Riverside and Ortega.
- The weatherstrip peels out of the kerf or flattens permanently. UV exposure and door-edge heat break down the vinyl after three to five years on west-facing exposures. Once it loses its memory, it doesn’t come back.
- The door closes fine but the lock throws only partway. That’s alignment drift between the edge bore and the strike, usually frame settlement at the header. It’s less common than people think, but when it happens, you’ll notice the deadbolt grinding against the strike plate lip.
See the difference
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AfterReplacement Cost & What’s Included
A full home addition or ADU installation in Jacksonville runs $45,000 – $130,000 depending on square footage, foundation type, and whether you’re adding a kitchen or bath rough-in. That number includes the Therma-Tru door package, framing, drywall, trim, paint, and our written scope before the first tool comes out.
On the smaller end of the scale, a door-specific issue like re-shimming a settled jamb, replacing a threshold, or installing a new sweep typically runs a few hundred dollars. We give you the line-item breakdown ahead of time: parts cost, labor hours, and what we’ll do if we open the casing and find rot behind it. No numbers that move at the door.
Every replacement or remodel we complete carries the 365-Day Done Right Promise. If the work fails within one year, we come back and correct it at no charge. That’s the Garrison Standard, and it applies to the Therma-Tru door on your addition the same way it applies to the kitchen behind it.
DIY or Call Us?
Replacing a Therma-Tru sweep or weatherstrip is something a careful homeowner can do in an afternoon, assuming the door slab itself hasn’t shifted. The manufacturer has clear diagrams, and the kerf profiles only fit one way. If the door is sticking, dragging, or showing daylight, though, don’t start shaving the slab or moving hinges without knowing exactly where the frame has settled. We’ve rebuilt more door openings than we’d like to count where somebody kept chasing the problem with a plane.
If you’re mid-project on a Jacksonville ADU and the door isn’t closing right, the worst move is to force it. Forcing a misaligned door separates the lamination at the hinge and lock corners. Call us at (904) 337-5929 and we’ll tell you over the phone whether it’s a simple adjustment or a frame that needs to be re-shimmed.
FAQs
A fiberglass Therma-Tru slab can last 30 years or more in Florida, but the weatherstrip and sweep are consumable parts that last 3 to 5 years on most exposures in Jacksonville. The door itself rarely fails unless the framing around it moves.
Yes, in most cases. Re-shimming the jamb, flashing the sill, and refinishing the casing will correct probably 80 percent of the door problems on additions we see in Jacksonville. Full frame replacement is for rot, severe settlement, or when a homeowner decides to change door size during a remodel.
For a single entry door with the same rough opening, plan on one full day including trim and paint touch-up. If the opening needs to be resized for a wider door, that’s a two to three day job with drywall and sheathing work.
We carry common sweeps, weatherstrip, hinge shims, and threshold caps for Smooth-Star and Fiber-Classic doors on our Jacksonville service runs. Odd-size sidelights or custom sill pans have a three-to-five-day lead time from the supplier.
Written by Curtis Lane, Owner, Bradford Remodeling Co Jacksonville at Bradford Remodeling Co Jacksonville, serving Jacksonville and nearby areas.
