CGI Custom & Geometric Windows Nationwide | Sightline Windows & Doors Kendall

CGI Custom & Geometric Windows in Kendall: What to Know First

As an independent CGI service provider, we measure, specify, and install CGI custom and geometric windows across Kendall with a written price before any work starts and a 365-Day Done Right Promise stamped on every job. Most custom CGI orders in Kendall run 4-6 weeks from measured survey to install, though geometric shapes with compound curves or oversized impact-rated units can stretch to 8 weeks depending on CGI’s current production queue. Our measured survey is the document you keep, and the written quote cannot differ from it - Haven Clause 1, the founding principle of Sightline since 2012.

Call (786) 321-3319

This page is for Kendall homeowners who already own CGI products or are specifying them for a new opening - an arched transom over a front door in The Hammocks, a trapezoid bank in a Pinecrest-adjacent remodel, or a custom impact-rated geometric in a Dadeland townhome. Call (786) 321-3319 to schedule your free measured survey.

How CGI Products Fail - and How We Fix Them

• Series 375/377 fixed geometric units: sealant degradation at the radius points. The curved aluminum extrusions in CGI’s 375 and 377 series expand and contract differently than the straight sections, and after 6-10 years in Kendall’s salt-air climate, the factory butyl seal at the radius can creep. We see this on second-story geometrics facing east toward Biscayne Bay. Our fix: remove the glazing stop, clean to bare metal, and re-bed with a neutral-cure silicone specified for aluminum-to-glass contact - not the hardware-store caulk that traps moisture.
• Series 238 impact-rated custom shapes: laminated glass delamination at the edge. CGI’s 238 series uses a thicker interlayer for impact rating, but in custom cuts where the glass edge sits close to the frame rebate, the interlayer can separate from heat cycling. Kendall’s afternoon thunderstorms followed by direct sun create the thermal shock that accelerates this. We spot it during our dry-fit inspection - Sonia’s habit of checking before sealant touches glass - and specify a wider edge clearance or a different interlayer formulation when the opening demands it.
• Series 301/302 single-hung custom widths: sash balance failure in oversized units. When a homeowner requests a single-hung wider than 42 inches, CGI uses a heavier sash and a paired balance system. The balance shoes wear asymmetrically, and the sash drifts or slams. We’ve replaced enough of these in Kendall’s 1980s ranch renovations to know the OEM balance assembly by part number, and we also stock a heavy-duty aftermarket balance that outlasts the original in openings over 48 inches.
• Custom circle-top and eyebrow units: frame racking during rough opening settlement. Kendall’s limestone substrate shifts seasonally, and a geometric window with a fixed radius cannot flex the way a rectangular unit can. The mullion joint between the rectangle and the radius cracks its caulk joint first. We diagnose this with a laser level on the frame face, then shim the sill or head as needed before re-glazing - not just re-caulking the symptom.
• Series 375 sliding glass door with custom sidelite: roller flat-spotting from debris track intrusion. The custom sidelite frame on a 375 slider narrows the track clearance, and Kendall’s Royal Poinciana litter jams the roller more readily than on standard-width doors. We pull the sash, inspect the roller axle for brinelling, and replace with a stainless-steel roller rated for the actual sash weight - not the standard roller that fits the pocket but fails in 18 months.

Our CGI Custom & Geometric Windows Process

1. 1
   Measured survey. We arrive with a laser measure, a moisture meter, and a camera. You keep the measured survey; it’s the basis for every document that follows.
2. 2
   Diagnostics. For repairs, we identify the series, the failure mode, and whether the fix is field-serviceable. For new custom geometrics, we verify the rough opening is plumb, square, and capable of carrying the dead load of impact-rated glass.
3. 3
   Parts decision. OEM CGI parts when the warranty is intact and the lead time is acceptable. Quality aftermarket when the OEM part is obsolete or the improved specification outperforms the original - documented in writing, never assumed.
4. 4
   Dry-fit before sealant. The frame goes in without sealant first. We check sightlines, operation, and clearances. Sonia’s rule: “Measure once, document it, then cut.” The photo record starts here.
5. 5
   Install and test. Sealant, fasteners, and hardware to CGI’s torque spec or our upgraded spec where experience warrants. Every operable unit is cycled 10 times. Every fixed geometric is checked with a straightedge for frame bow.
6. 6
   Documentation and close. You receive the final invoice - identical to the quote - plus the photo record and the 365-Day Done Right Promise under the Haven Standard.

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What CGI Custom & Geometric Windows Costs in Kendall

These are the ranges we quote in writing before work starts. The price you sign is the price on the final invoice - no change orders, no surprises. Call (786) 321-3319 for your free measured survey and exact quote.

Why Kendall Homeowners Call Sightline Windows & Doors Kendall for CGI Work

We’ve been measuring and setting frames in Kendall long enough to know which CGI series were installed in which subdivision during which building boom. The crew Sonia Raman leads recently finished a full impact-window retrofit on a block of townhomes near Dadeland Mall - CGI 238 series throughout, with custom trapezoids on the stairwell landings. That job required three manufacturer lines before we found the right specification for the opening: CGI for the standard rectangles, PGT for the oversized fixed units, and ES Windows for the custom radius tops that CGI’s queue couldn’t accommodate in the owner’s timeline.

That flexibility is the point of carrying eight verified lines. We’re not tied to CGI’s production schedule or their current catalog. If a CGI geometric is the right product, we specify it. If another manufacturer’s custom shape fits the opening better, we document why and price it openly. Every technician is background-checked, uniformed, and identified by license number before arrival - Haven Clause 3. The 365-Day Done Right Promise is written into the Haven Standard, not offered as a courtesy. And the phone is answered by a live person, 24/7, because a homeowner staring at a cracked geometric on a Saturday evening deserves a human voice.

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