Therma-Tru Custom & Geometric Windows Nationwide | Sightline Windows & Doors Boca Raton

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

We provide independent Therma-Tru service for custom and geometric windows in Boca Raton, with most measured surveys scheduled within 48 hours and written quotes delivered before any work begins. Custom and geometric Therma-Tru units - arched, curved, oversized, and specialty-shaped openings - typically run $2,800 to $7,500 installed depending on glass package, impact rating, and whether the rough opening needs reframing. We are not affiliated with or authorized by Therma-Tru; we are an independent service provider who stocks and sources Therma-Tru-compatible components by specification.

Call (561) 200-8592

This page is for Boca Raton homeowners who already have Therma-Tru products and need custom or geometric window replacement, new installation in a shaped opening, or troubleshooting on an existing unit that is not performing. If you are comparing brands, we also specify PGT, CGI, CWS, and ES Windows - but this page covers what we have learned from working on Therma-Tru products specifically.

Call (561) 200-8592 to schedule your measured survey. The document you receive is the same one we build from.

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

• Classic-Craft arched units develop seal failure at the springline. The curved top rail in the Classic-Craft series uses a laminated finger-joint that flexes differently than the straight stiles below. In Boca Raton’s high-humidity, high-UV cycle, that differential movement breaks the primary seal at the exact point where the arch meets the jamb. We see this most in west-facing elevations where afternoon heat builds behind shutters. Our fix: remove the sash, document the sightline deviation with photos, and replace with a factory-ordered arched sash using the current Tru-Defense glazing system rather than field-reglazing, which voids the remaining warranty.
• Smooth-Star geometric windows leak at the mitered corner joints. The Smooth-Star line is fiberglass, which expands and contracts at a different rate than the vinyl corner keys Therma-Tru used in production runs through 2019. In shaped windows - hexagons, octagons, trapezoids - those corners carry shear stress that rectangular units do not. The symptom is a fine crack in the exterior corner caulk that lets water track behind the brickmould. We do not caulk over it. We disassemble the corner, replace the key with an updated co-extruded version, and reseal with a backer rod and structural sealant rated for the movement.
• Impact-rated custom units from the 2016-2019 period show delamination at the glass edge. Therma-Tru sourced impact glass from multiple laminators during those years, and some lots carried edge separation when exposed to Boca Raton’s salt air and sustained interior cooling. The tell is a milky haze at the perimeter that does not wipe off. We identify the laminator from the etched mark in the corner, source matching replacement glass through our ES Windows and CWS supply lines if Therma-Tru OEM is back-ordered, and document the origin for any future warranty claim.
• Oversized Direct Set units sag in the header over time. Therma-Tru’s Direct Set line - fixed geometric shapes without operable sashes - relies on the rough opening header to carry the load. In Boca Raton’s 1980s-2000s construction, that header is often a double 2×10 with no engineered lumber. A 6-foot circle or 8-foot ellipse in a Direct Set frame will gradually compress the header, opening a gap at the top reveal. We measure the compression with a laser level, sister the header with LVL if the structural engineer signs off, and reinstall with composite shims that do not rot.
• Entry door sidelites with geometric grilles lose adhesion in the raised profile. The decorative grille pattern in Therma-Tru sidelites - half-rounds, ellipses, quarter-arches - is surface-applied PVC over an aluminum spacer. The adhesive softens in attic heat and the grille lifts, creating a shadow line that looks like seal failure but is not. We have learned to test with a feeler gauge before ordering glass. If the seal is intact, we remove the grille, clean the profile with denatured alcohol, and re-adhere with VHB tape rated for 200°F surface temperature. If the seal has failed from the flexing, we order a new lite.

Our Therma-Tru Custom & Geometric Windows Process

1. 1
   Measured survey. Sonia Raman or a verified crew member arrives with a printed license number, measures the rough opening in three places each direction, records the sightline - the visible glass dimension from the interior - and notes the existing frame condition. You keep the survey document.
2. 2
   Diagnostics. We identify the Therma-Tru series from the frame profile, check the glass edge for laminator marks, test operation on any operable sash, and photograph the failure mode. If the unit is under warranty, we flag what would void it.
3. 3
   Parts decision. OEM Therma-Tru components are our first specification. If lead time exceeds three weeks or the part is discontinued, we source equivalent from our PGT, CGI, or CWS lines and document the substitution with written justification - Haven Clause 1 requires the price and the specification to match.
4. 4
   Installation. We protect the interior, remove the existing unit without disturbing surrounding finishes where possible, install the replacement to the measured survey dimensions, and shim with composite or stainless - never pine, which we have seen rot out in Boca Raton’s humidity within four years.
5. 5
   Testing and documentation. We operate every sash, check the seal with a smoke pencil, photograph the completed installation from interior and exterior, and upload the photo record to your file. The written invoice matches the survey; there is no separate “final bill.”
6. 6
   365-Day Done Right Promise. If the unit does not perform as specified, we return and correct it. The promise is stamped on every job, not offered as a courtesy.

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What Therma-Tru Custom & Geometric Windows Costs in Boca Raton

These are the ranges we have written in 2024 and 2025 for Therma-Tru custom and geometric work in Boca Raton. Every job gets its own measured survey and fixed written price.

Impact-rated glass adds 35-50% to any of the above. Header reframing, if needed, is priced separately after structural review. We do not estimate what we have not measured.

Bring us any competitor’s written estimate and we will review it at no charge. Call (561) 200-8592 to schedule your measured survey - the price we write is the price you pay.

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

We have installed and serviced 18,000+ openings since 2012 under the Haven Standard. Every one had a written price before work started and a documented photo record when it finished. Our technicians are background-checked, uniformed, and identified by license number before arrival - Haven Clause 3, Verified Crews.

We carry eight manufacturer lines, which matters when Therma-Tru lead times stretch or a discontinued profile needs matching. In Boca Raton’s coastal climate, we have learned which glass packages hold up and which corner details fail. Sonia Raman keeps a running log of every unit: brand, glass package, U-factor, date, and customer name. A warranty conversation five years out goes better when you have the paperwork.

Calls are answered by a live person, 24/7. Not a voicemail queue. Not a callback window.

Measure it twice, write it down, then we can talk price.

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