Therma-Tru Custom & Geometric Windows Nationwide | Sightline Windows & Doors Tamiami

Therma-Tru Custom & Geometric Windows in Tamiami: What to Know First

We provide independent Therma-Tru custom and geometric window service in Tamiami, from arched and curved configurations to oversized openings that standard replacement stock won’t fit. Most custom Therma-Tru orders we handle in this market run six to ten weeks from measured survey to installation, with repair work on existing units typically scheduled within a few business days. Our written price, based on the measured survey you keep, is the price on the final invoice - Haven Clause 1, no exceptions.

Call (786) 321-9118

This page is for Tamiami homeowners who already own Therma-Tru products and need custom or geometric window work: replacement of shaped units, retrofit of impact-rated geometric windows into existing openings, or correction of installation errors that are showing up as air infiltration or frame distortion. If you’re comparing options across brands, we also specify and install PGT, CGI, CWS, and ES Windows - but this page covers what we know about Therma-Tru specifically. Call (786) 321-9118 to schedule your free measured survey.

How Therma-Tru Products Fail - and How We Fix Them

• Classic-Craft arched units: seal failure at the springline. The curved top rail in Classic-Craft geometric windows creates a stress concentration where the arch meets the jamb. In Tamiami’s high-humidity, high-UV environment, the dual-seal gasket at this junction degrades faster than on rectilinear units. We see this as fogging that starts at the springline and spreads. Our fix: remove the sash, inspect the spacer bar for corrosion (common in coastal Tamiami air), and reinstall with OEM replacement glazing tape and a silicone back-bedding that matches the original NOA spec.
• Fiber-Classic octagon and hexagon windows: corner delamination. The engineered composite stiles and rails in Fiber-Classic geometric shapes are bonded at mitered corners with a two-part urethane. Thermal cycling in unshaded west-facing Tamiami openings causes differential expansion between the fiberglass skin and the composite core. The symptom is a visible hairline at the corner that weeps during driving rain. We rout the joint, inject structural epoxy rated for the Fiber-Classic substrate, and clamp with a jig that restores the original sightline angle.
• Smooth-Star oversized rectangles with factory-applied grids: grid clip fatigue. Therma-Tru’s SDL (simulated divided lite) grid system on large-format Smooth-Star units uses nylon clips that fatigue after seven to ten years in South Florida heat. The grid bars bow outward, creating a shadow gap and rattling in wind. We stock the OEM clip profile but often spec a marine-grade stainless clip from our aftermarket supplier - same sightline, longer fatigue life, and it doesn’t void the glass warranty because we’re not altering the IGU seal.
• Entry door sidelites with geometric transoms: frame racking from improper shimming. Therma-Tru door systems with custom transoms above - half-rounds, ellipses, or extended rectangles - are often installed by framers who shim the transom frame independently of the door jamb. In Tamiami’s sandy soils, differential settlement separates the two frames. We diagnose this with a laser level across the head jamb, then re-shim with composite wedges that bridge both frames as a single structural unit, restoring the sightline and the weatherstrip compression.
• Impact-rated custom units: laminate creep in the IGU. Therma-Tru’s impact geometric windows use a PVB interlayer that can cold-flow under sustained edge pressure if the glazing pocket is too tight. Tamiami homes near the canal systems - particularly in the neighborhoods west of Tamiami Trail - see this where seasonal humidity swells the vinyl frame slightly. The symptom is a visible edge band in the glass that wasn’t there at installation. We remove the IGU, re-machine the glazing pocket to NOA tolerance, and reinstall with setting blocks positioned to the revised quarter-point calculation.

Our Therma-Tru Custom & Geometric Windows Process

1. 1
   Measured survey you keep. Sonia Raman or a verified crew member arrives with a laser measure and a printed survey form. We record rough opening dimensions in three places - head, sill, and mid-point - note wall thickness and substrate, and photograph the existing unit from interior and exterior. You keep the original survey; we work from a copy.
2. 2
   Diagnostics with the failure mode in mind. Based on the unit series and the symptoms you’ve described, we inspect for the known issues above. We test air infiltration with a smoke pencil, check sash operation with a dial indicator for racking, and record frame squareness to 1/16 inch.
3. 3
   Parts decision: OEM or verified aftermarket. For glazing components and weatherstrip, we default to Therma-Tru OEM. For hardware, grid clips, or setting block profiles where we’ve documented longer service life from an aftermarket source, we present both options with the spec sheet and price for each. You choose; we order.
4. 4
   Installation or repair to the Haven Standard. Verified crews - license number provided before arrival, background-checked, uniformed - perform the work. Every step is photographed: before, rough opening condition, shim placement, fastener schedule, and finished unit. The photo record uploads to your job file by end of day.
5. 5
   Final test and written sign-off. We operate the sash through full travel, verify lock engagement, and re-test with the smoke pencil. You sign the completion document that references the original measured survey and the 365-Day Done Right Promise. The written price on that document matches the quote; Haven Clause 1, again.
6. 6
   Cleanup and documentation delivery. We leave the work area as found, deliver your photo record link, and the job enters our follow-up queue at 30, 180, and 365 days. “Measure it right, order it right, install it once.”

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What Therma-Tru Custom & Geometric Windows Costs in Tamiami

These are the price ranges we write on our measured surveys for typical Therma-Tru custom and geometric window work in the Tamiami market. Your exact quote depends on the series, the opening condition, and whether we’re matching existing trim profiles.

• Geometric sash replacement (octagon, hexagon, quarter-round): $890 - $1,450 per opening
• Arched top unit, full frame replacement (Classic-Craft or Fiber-Craft): $1,650 - $2,400 per opening
• Oversized rectangular replacement (Smooth-Star, over 60″ on either dimension): $1,200 - $1,850 per opening
• Geometric transom repair (re-shim, seal, no glass replacement): $340 - $580
• IGU replacement in existing custom frame (impact-rated laminate): $680 - $1,120 per lite
• SDL grid replacement or conversion (OEM or marine-grade stainless clips): $180 - $420 per opening

What moves the price: wall substrate condition (stucco repair adds labor), scaffold or ladder work above first floor, and whether the original unit was installed with integral fins that require siding remediation. We disclose all three on the written quote before you approve. Call (786) 321-9118 for your free measured survey - the price we write is the price you pay.

Why Tamiami Homeowners Call Sightline Windows & Doors Tamiami for Therma-Tru Work

We’ve completed more than 18,000 window and door openings since 2012, and a measurable share of those have been in the Tamiami corridor - from the neighborhoods abutting Tamiami Trail west toward the Miccosukee Resort area, where we’ve done full impact-window retrofits on homes with custom geometric packages that mixed Therma-Tru entry systems with shaped windows from other lines.

Our technicians carry license numbers, not just business cards. The 365-Day Done Right Promise is stamped on every job, not offered as a courtesy. And because we specify across eight manufacturer lines - PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru, and ViewLux - we can tell you when a Therma-Tru unit is the right specification and when another line’s geometric program fits the opening better. No manufacturer relationship influences that recommendation; we’re independently owned and operated under the Haven Standard, not a dealer channel.

Sonia Raman reads every measured survey before it becomes a quote. If the rough opening doesn’t match what her crew recorded, the job stops until it does.

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