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Therma-Tru Windows & Doors: The Jacksonville Owner’s Guide
If you’ve got a Therma-Tru door or window in Jacksonville that’s failing, the most likely culprits are the weatherstripping, the sweep, the sill cap, or the multipoint lock assembly. Installed replacement for these parts typically runs $180 to $680 depending on what failed and whether the frame itself has taken on moisture damage. We stock the common Therma-Tru replacement parts on our trucks, and we’ve been swapping them out in Jacksonville homes long enough to know which ones fail first in our humidity.
Here’s the picture we see most often: a door that worked fine for years suddenly starts sticking in the frame, or drafts appear around the edges, or the lock no longer throws cleanly. Therma-Tru makes a solid product, but Jacksonville’s heat and humidity put real stress on the seals and moving parts. You notice it at the worst time, usually a July afternoon when the AC is working overtime, or the first cold snap when the draft is impossible to ignore.
Which Therma-Tru Models This Applies To
Therma-Tru builds doors and windows across three broad lines: the Classic-Craft, Fiber-Classic, and Smooth-Star door lines, plus the Pulse and Benchmark window and patio door series. The parts that fail are largely shared across these lines, but the specs are not interchangeable between every model year. A Classic-Craft door from 2012 takes a different sweep profile than one built in 2022, and the corner pads on a Pulse window changed dimensions during a manufacturing update in the late 2010s.
The fastest way to identify what you need is to look for the serial number sticker on the hinge edge of the door slab or the top rail of the window sash. If that sticker is gone or faded, we take measurements: door thickness, sweep channel width, sill cap length, and the screw spacing on the lock plate. That last one catches more people than anything else. Therma-Tru changed their multipoint lock plate screw pattern on certain model years, and the wrong plate is off by a quarter inch, no matter what the listing online says.
We install OEM Therma-Tru parts wherever the original part is still manufactured. When it’s not, we use aftermarket equivalents that match the original’s dimensions and material spec. The aftermarket sweeps and weatherstripping we use are made from the same EPDM rubber compound, and they hold up the same in Jacksonville’s UV and humidity. What we won’t do is hand you a universal part and call it good. Universal fits nothing well.
Styles & brands we work with
Signs Your Therma-Tru Windows & Doors Is Failing
- Visible light under the door. The sweep has compressed or torn, and it’s no longer sealing against the sill. Jacksonville’s heat accelerates the breakdown of the rubber compound, and once it loses its flex, air moves freely underneath.
- Sticking or dragging at the top corner. The door slab has settled or the hinges have worn, and the reveal has shifted. On Therma-Tru fiberglass slabs, this is rarely the slab warping; it’s almost always the jamb moving or a hinge pin wearing enough to drop the door a few millimeters.
- Condensation between window panes. That’s a failed insulated glass unit. Therma-Tru’s Pulse windows carry a long glass warranty, but once the seal fails, the only fix is replacing the glass pack or the sash entirely.
- The multipoint lock won’t throw without lifting the handle. The lock assembly has shifted in the faceplate, or one of the roller pins has worn flat. Forcing it only chews up the strike plate on the jamb side, and now you’ve got two problems.
- Soft spots at the bottom corner of the door frame. Water has been getting past the sill cap and into the substrate. By the time you can feel the softness from inside, you’re usually looking at frame repair, not just a part swap.
See the difference
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AfterReplacement Cost & What’s Included
Here’s what we charge in Jacksonville for the most common Therma-Tru repairs, parts and labor together:
| Repair | Installed Price Range |
|---|---|
| Door sweep replacement | $180 – $320 |
| Weatherstripping replacement (full perimeter) | $240 – $420 |
| Sill cap replacement | $320 – $680 |
| Multipoint lock assembly replacement | $380 – $720 |
| Window sash glass pack replacement | $350 – $750 per sash |
The range comes down to the door model, whether the frame needs to be routed or shimmed to accept the new part, and whether we’re repairing substrate damage at the same time. You’ll get a written price before any work starts, and that price does not move unless we open the wall and find something neither of us could have known was there. If that happens, we stop and show you what we found before touching another screw. Every replacement we install carries the 365-Day Done Right Promise: if it fails within a year, we come back and make it right at no charge.
DIY or Call Us?
Replacing a door sweep is a job a homeowner with a screwdriver and a hacksaw can handle, as long as they buy the correct profile. If you want to check the wear yourself, close the door and look for daylight under the sweep from the outside, then run your hand along the weatherstripping to feel for flat spots. If either fails, you know the part is done.
What you should not do yourself is anything involving a multipoint lock assembly, a sill cap that’s been leaking into the subfloor, or a window sash glass pack. The lock is under spring tension, the sill cap hides water damage you can’t see until it’s removed, and the glass pack weighs more than most people expect and is easy to crack against the frame. We see the results of good-intentioned DIY repairs often enough to know when to say: call someone. If you’re in Jacksonville and you want it done right the first time, call us at (904) 337-5929.
FAQs
Expect four to seven years from a door sweep in Jacksonville’s climate. The UV and humidity break down the EPDM compound faster than you’d see in drier northern climates, and the sweep is the first part to go on virtually every Therma-Tru door we service. If your sweep is older than about five years and you can see daylight underneath, it’s time. Call (904) 337-5929 and we’ll match the right profile to your door.
No, a failed window seal can’t be repaired. Once the argon leaks out and condensation starts forming between the panes, the glass pack has to be replaced. The sash and frame are usually fine; it’s the insulated glass unit itself that failed. We replace the glass pack only, which is much less expensive than a full window replacement. Call (904) 337-5929 and we’ll measure the sash and quote you a written price.
Most single-part replacements, like a sweep, weatherstripping run, or lock swap, take under two hours from the time we start until the site is cleaned up and the door is tested. Sill cap replacements that involve substrate repair take longer, usually a day, because we open the frame, dry the area, replace what’s rotted, and then install the new cap. You’ll get a clear time estimate on the written quote before we start.
We keep the most common Therma-Tru sweeps, weatherstripping profiles, sill caps, and lock plates on our trucks, so many repairs can be completed on the first visit. Less common parts, particularly older model-year lock assemblies and specific glass pack sizes, take three to five days to order. If your part is on backorder, we’ll tell you before you commit to anything and give you the exact cost and timing in writing. Call (904) 337-5929 and we’ll check what’s on the truck.
Bradford Remodeling Co Jacksonville is an independent service provider. We are not affiliated with Therma-Tru, and we repair and replace doors and windows from a range of manufacturers, including Therma-Tru, KraftMaid, Cambria, and Silestone products.
Written by Curtis Lane, Owner, Bradford Remodeling Co Jacksonville at Bradford Remodeling Co Jacksonville, serving Jacksonville and nearby areas.
