Therma-Tru Windows & Doors Service Nationwide | Sightline Windows & Doors Kendall

Why Kendall Homeowners Choose Therma-Tru Windows & Doors

We provide independent Therma-Tru Windows & Doors in Kendall, FL, specializing in fiberglass entry door repair, multi-point lock restoration, and full replacement of warped slabs and failed sill systems. Our technicians work on more Therma-Tru door systems across Kendall than any other independent outfit, so we’ve learned exactly how their slabs, multi-point locks, and glass cassettes behave in South Florida’s heat and storm cycles. We are an independent trade provider and are not affiliated with, authorized by, or sponsored by Therma-Tru. Call (786) 321-3319 to schedule your free estimate.

Call (786) 321-3319

Therma-Tru’s fiberglass entry lines - Smooth-Star, Fiber-Classic, and Classic-Craft - dominate Kendall’s replacement market because the material doesn’t rot, dent, or corrode like steel or wood in our subtropical humidity. The Smooth-Star line in particular shows up on thousands of Kendall homes built or renovated after Hurricane Andrew, when homeowners wanted the look of painted wood without the maintenance liability. That first wave of post-Andrew installations is now 25-30 years old, and we’re seeing a predictable pattern of failure: not the fiberglass itself, but the components that connect the slab to the house - hinges, sills, sweeps, and lock gearboxes - succumbing to decades of thermal cycling and standing water.

Kendall sits inside Miami-Dade County’s High Velocity Hurricane Zone, where every replacement window and door must carry a Miami-Dade Notice of Acceptance. Therma-Tru’s impact-rated glass cassettes and door systems meet this standard, but only when installed with the exact NOA-matching hardware and sealed to the specific design pressure. A contractor who sources Florida Product Approved but non-NOA-certified components will fail inspection every time. We pull permits on every job and document the NOA match before ordering parts.

Why Trust Sightline Windows & Doors Kendall for Your Therma-Tru Windows & Doors?

Sonia Raman, our owner, grew up in Miami and picked up her first caulking gun helping a neighbor re-glaze jalousies on a Saturday she’d rather not have given up. She trained in building construction technology at Miami Dade College before spending the better part of two decades in the field doing window and door work across South Florida. Her crew has been measuring and setting frames in Kendall for years - most recently finishing a full our Window Installation services impact-window retrofit on a block of townhomes near Dadeland Mall. She’s known for insisting on a dry-fit before any sealant touches glass, a habit that has saved more than a few jobs from a costly redo.

That insistence carries over to every Therma-Tru door we touch. We don’t guess at hinge placement or sweep compression. We measure the slab warp with a straightedge, check the frame plumb with a laser, and test the multi-point lock engagement at each keeper before we quote the repair. Our technicians are background-checked, uniformed, and identified by license number before arrival - Haven Clause 3, Verified Crews. The person at your door is the person on the record.

We stock genuine Therma-Tru replacement parts locally: hinges, adjustable sill systems, sweeps, glass cassettes, and lock cartridges. Aftermarket fiberglass door hardware rarely matches the door’s prep and voids the performance the slab was engineered for. When we specify a part, it’s because it fits the original machining, not because it’s close enough. And we document everything - the measured survey you keep, the written scope, the photo record, the warranty. Measure once, document it, then cut.

Our 365-Day Done Right Promise applies to every Therma-Tru job we complete in Kendall. If it’s not done right, we make it right - written into the Haven Standard, not a verbal assurance. The written price you receive before any work starts is the final price; Haven Clause 1 means the measurement and the quote are the same document.

Common Therma-Tru Windows & Doors Problems We Fix in Kendall

• Fiberglass slab warp on south and west exposures. Therma-Tru Smooth-Star and Fiber-Classic slabs on south- and west-facing Kendall entries can bow at the hinge stile after years of direct sun exposure. The slab pulls away from the weatherstrip, the bottom sweep drags across the threshold, and the multi-point lock won’t align with its keepers. We see this most on homes along the Kendall Drive corridor where afternoon sun bakes entries with no porch overhang. A full re-hang on heavy-duty hinges, combined with a sill and sweep replacement, often restores the door without slab replacement.
• Multi-point lock gearbox and shoot bolt corrosion. Therma-Tru’s multi-point systems - the gearboxes and top/bottom shoot bolts - corrode in Kendall’s humidity and go out of alignment. The handle latches at the center point, but the top and bottom bolts never extend into their keepers. The door isn’t fully secured. We replace the corroded gearbox with OEM Therma-Tru lock cartridges and realign the strike plates so all three points engage with one push.
• Adjustable sill and sweep gasket degradation. Therma-Tru’s adjustable sill systems and sweep gaskets break down in our subtropical humidity and let water track under the door during wind-driven rain. This is especially common in low-elevation Kendall neighborhoods where standing water pools against thresholds after heavy afternoon thunderstorms. We replace the entire sill assembly and sweep with OEM parts, then test with a hose spray to verify the seal.
• Handleset loosening and deadbolt misalignment. Emtek and Therma-Tru handlesets loosen at the escutcheon over time, and the deadbolt no longer engages its strike cleanly. The cause is expansion and contraction of the fiberglass slab through our thermal cycles - 90°F afternoons dropping to 75°F evenings, repeated thousands of times. We re-seat the hardware with proper backset alignment and replace worn strike plates.
• Glass cassette seal failure in impact-rated units. Therma-Tru’s impact-rated glass cassettes can lose their butyl seal after 15-20 years, allowing moisture between the laminated layers. The glass still meets impact code, but the sightline is fogged and the thermal performance is shot. We replace the cassette with a new NOA-certified unit that matches the original design pressure rating.

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Therma-Tru Parts & Our Repair-vs-Replace Approach

We stock and install genuine Therma-Tru replacement parts because aftermarket fiberglass door hardware rarely matches the door’s prep. A generic hinge won’t sit flush in a Smooth-Star mortise. An aftermarket sweep won’t compress correctly against Therma-Tru’s adjustable sill geometry. And a non-OEM lock cartridge may engage the handle spindle at the wrong angle, causing premature wear or complete failure.

When a slab is warped beyond re-hanging or the frame is water-damaged from years of sill leaks, we tell homeowners honestly whether a hardware-and-glass refresh will hold up or whether full frame entry door replacement is the smarter long-term call in this coastal climate. The honest answer depends on what we find: frame readings, sightline measurements, and product specs. We don’t sell replacement for replacement’s sake. Call (786) 321-3319 for a free estimate - we’ll measure and give you the written answer.

Our Therma-Tru Service Process - Step by Step

1. 1
   Diagnosis with documented measurement. We arrive with a straightedge, laser level, and moisture meter. We check slab warp, frame plumb, sill level, and lock engagement at all three points. You keep the measured survey. The written quote cannot differ from that document - Haven Clause 1.
2. 2
   Parts specification and ordering. We identify the exact Therma-Tru series, model year, and component spec. If we don’t have the part in our local stock, we order genuine OEM with confirmed NOA certification for Miami-Dade HVHZ compliance.
3. 3
   Repair or installation with dry-fit verification. Sonia’s rule: dry-fit before sealant. We hang the slab, test sweep compression, cycle the lock twenty times, and check sightline alignment before any permanent fastening.
4. 4
   Performance testing and photo documentation. We hose-test sills for water intrusion, cycle locks under load, and photograph every critical detail. You receive the documented photo record as standard evidence - Haven Clause 4.
5. 5
   Warranty registration and 365-Day Done Right Promise. We register any new Therma-Tru components for warranty coverage and stamp the job under our Haven Standard guarantee. If it’s not done right, we make it right.

Therma-Tru Products We Service & Install in Kendall

We work across the full Therma-Tru residential line: Smooth-Star fiberglass entry doors (paint-ready surface, most common in Kendall’s post-Andrew rebuilds); Fiber-Classic collection with woodgrain-textured fiberglass; Classic-Craft premium series with deeper panel profiles; and Benchmark and Profiles composite patio door lines with multi-slide and French door configurations. We stock hinges, sill systems, sweeps, glass cassettes, and lock cartridges for all series. For hurricane-proof front and entry doors, we specify impact-rated glass cassettes and multi-point lock systems that carry current Miami-Dade NOA numbers.

We Also Service These Brands

Our eight verified manufacturer lines let us specify by performance tier and price range, not by margin. Alongside Therma-Tru, we service and install PGT, CGI, CWS, and ES Windows impact and energy-efficient systems. If your project involves multiple brands or you’re comparing options, we provide a written specification for each with line-item pricing.

FAQs - Therma-Tru Windows & Doors Service in Kendall

Is Sightline Windows & Doors Kendall authorized by Therma-Tru?

No. We are an independent Therma-Tru service provider and are not affiliated with, authorized by, or sponsored by Therma-Tru Corporation. Our technicians are trained through field experience on thousands of Therma-Tru installations across South Florida, not through a manufacturer program. We source genuine OEM parts through verified distribution channels.

My Therma-Tru fiberglass door won’t latch in the summer - is that the lock or the door?

Usually both, but the root cause is slab warp. South- and west-facing Therma-Tru Smooth-Star and Fiber-Classic slabs expand and bow at the hinge stile under sustained heat, which throws off the multi-point lock alignment. The lock gearbox may be functional, but the shoot bolts miss their keepers. We measure the warp, re-hang if possible, and replace the lock if corrosion has set in. Call (786) 321-3319 and we’ll diagnose it on the first visit.

Will the original Therma-Tru glass inserts hold up to hurricane wind ratings?

Only if they were originally specified as impact-rated and the butyl seal is still intact. Original non-impact decorative inserts in pre-Andrew Kendall homes do not meet current HVHZ requirements. Even impact-rated cassettes lose their seal after 15-20 years. We inspect the laminate edge for delamination and replace with current NOA-certified cassettes when needed.

Can you replace just the Therma-Tru door slab and keep the existing frame?

Sometimes, but rarely on doors over 15 years old. The frame must be plumb, square, and free of water damage. We check with a laser level and moisture meter before quoting slab-only replacement. In Kendall’s humidity, frame rot at the sill is common enough that we find full frame replacement is often the honest recommendation.

What causes the water puddling at my Therma-Tru door threshold after storms?

Degraded sweep gaskets and adjustable sill systems that no longer compress correctly. Therma-Tru’s sills are designed to drain, but once the sweep hardens or the sill channels clog with debris, wind-driven rain pushes straight through. Standing water in low-elevation Kendall neighborhoods makes it worse. We replace the sill assembly and sweep, then hose-test to verify.

Do you service Therma-Tru patio and French doors, or just entry doors?

We service the full line including Benchmark and Profiles composite patio doors and French door systems. The same failure modes apply - sill degradation, multi-point lock corrosion, and slab warp on dark-colored units in direct sun. Call (786) 321-3319 for an exact quote - estimates are free.

How much does Therma-Tru windows and doors service cost in Kendall?

Repair work typically ranges from $280 for a sill and sweep replacement to $740 for multi-point lock gearbox replacement with full re-hang and adjustment. Full entry door replacement with a new Therma-Tru Smooth-Star slab, frame, and impact-rated glass cassette generally runs $3,200-$5,800 depending on size, sidelite configuration, and hardware grade. Patio door systems start around $4,500. Every quote is written and itemized before any work starts - Haven Clause 1. Call (786) 321-3319 for an exact quote - estimates are free.

Will service void my Therma-Tru warranty?

Using non-OEM parts or unqualified labor can void remaining warranty coverage. We use genuine Therma-Tru replacement components and document the installation to preserve any valid warranty. We also register new parts with Therma-Tru when required. If your door is already past its warranty period, our 365-Day Done Right Promise still covers our workmanship.

Book Your Therma-Tru Service in Kendall, FL

Call (786) 321-3319 to schedule your free estimate. A live person answers, 24/7. We’ll bring the measured survey, the written price, and the documented photo record - Haven Standard on every job, since 2012.

Written by Sonia Raman, Owner at Sightline Windows & Doors Kendall, serving Kendall since 2012.