Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Before
After
Before
After
Before
AfterTherma-Tru Window Installation: The North Palm Beach Owner’s Guide
Therma-Tru window installation in North Palm Beach typically runs $340-$780 per opening depending on series, frame condition, and whether the rough opening needs correction. We stock Therma-Tru-compatible installation hardware and flashing systems for same-day starts on most jobs, and we carry PGT and CGI lines as alternatives when the opening calls for a different performance tier. Most North Palm Beach homeowners discover a Therma-Tru window is failing when the sash drifts open after locking, the weep system backs up during afternoon thunderstorms, or they spot daylight between the frame and the buck after a front moves through.
Which Therma-Tru Models This Applies To
Therma-Tru organizes its window lines by frame material and impact rating, and the installation approach changes with each. The Classic-Craft and Fiber-Classic series use pultruded fiberglass frames that require stainless fasteners and specific backer-rod diameters; the Profiles and Traditions vinyl lines use a nailing fin system with integrated J-channel that demands precise squareness within 1/8 inch. We also see the Benchmark and Ovation entry-level vinyl units in North Palm Beach homes built between 2015 and 2020, particularly in the Lakeside Park area where builders spec’d to price point during that cycle.
To identify your exact series, check the etched code in the glass corner or the AAMA label on the frame head. The first three digits after “TTW” indicate the series generation, and that determines whether your unit uses the older snap-in sash system or the current co-extruded bulb seal. OEM installation kits from Therma-Tru include proprietary corner keys and weep covers that aftermarket suppliers rarely match exactly; we stock both because some North Palm Beach homeowners need the warranty-preserved OEM route while others want the faster aftermarket solution when the frame geometry allows it. If the opening isn’t right, the window isn’t right - that’s where we start.
Signs Your Therma-Tru Window Installation Is Failing
- Sash drops or drifts after locking. This usually means the balance shoe or tilt-latch pocket has wallowed out in the jamb liner. On Therma-Tru vinyl units, the OEM shoe is a 5/8-inch polymer part that degrades faster in Florida’s UV load than the manufacturer rates it.
- Water pools on the sill after rain, even with closed sash. The weep channels are likely clogged with construction grit or the flap valves have hardened. In North Palm Beach, pollen season and salt air compound this; we find blocked weeps on roughly 40 percent of five-year-old installs we survey.
- Daylight visible between frame and buck, or caulk separation. The installation flange may have pulled, or the original shim stack compressed. Concrete-block construction in older North Palm Beach homes shifts differently than frame, and the fastener pattern needs to account for it.
- Condensation between panes on impact-rated units. The IGU seal has failed. Therma-Tru’s impact glass uses a thicker interlayer that changes the thermal expansion rate; a mismatched installation can stress the edge seal over time.
- Operation gets stiff seasonally, then frees up. The frame is racking in the opening. This is almost always an installation issue, not a product defect - the rough opening was out of square and the installer shimmed to fit instead of correcting the buck.
Before
AfterReplacement Cost & What’s Included
| Scope | Price Range |
|---|---|
| Standard Therma-Tru window install, existing opening sound | $340-$520 |
| Install with rough-opening correction (shim, buck repair) | $520-$680 |
| Full-frame replacement with impact-rated upgrade | $620-$780 |
| IGU replacement only (seal failure, frame intact) | $280-$420 |
These prices include the measured survey you keep, the written scope that matches it, background-checked crew, and the documented photo record on completion. What drives the range: frame material (fiberglass costs more to handle than vinyl), whether the block or wood buck needs rebuild, and if we’re matching an existing non-impact unit or upgrading to HVHZ-rated. We do not quote one number and invoice another. The 365-Day Done Right Promise covers the installation workmanship; product defects fall to Therma-Tru’s own warranty, which we document and file for you. Call (561) 475-1246 for your written estimate - the price we name is the price on the final invoice.
DIY or Call Us?
There is nothing in a Therma-Tru window install that will sever a finger or electrocute you. The risk is slower: a unit set out of plumb will bind, leak, and void the warranty. An owner can safely check the weep holes with a pipe cleaner, confirm the lock engages fully, and photograph any daylight gaps for reference. What goes wrong in DIY is the measurement. A quarter-inch taper across a 36-inch rough opening is invisible to the eye and fatal to the seal. We have removed owner-installed units where the fastener missed the buck entirely and buried in the cavity - no structural connection, no warranty, and water damage to the king stud. Sonia Raman measures every opening herself on the first visit because she has seen what that quarter-inch assumption costs in lead time and money. If you have a written estimate from another contractor, we will review it free under our Second Opinion policy.
FAQs
A properly installed Therma-Tru vinyl window in North Palm Beach should perform 15-20 years; fiberglass units often reach 25. The limiting factor is usually the installation, not the product. Salt air, afternoon UV exposure, and the expansion cycles of concrete-block construction stress the sealant line continuously. Call (561) 475-1246 for an exact quote - estimates are free.
Sometimes. If the issue is a failed balance shoe, clogged weep, or separated caulk bead, component repair is reasonable. If the frame is racking, the flange is pulling, or the IGU has failed, the unit needs to come out and go back in square. We document both options in writing before you decide.
A straightforward replacement in a sound opening takes 2-3 hours per unit. Rough-opening correction adds 2-4 hours depending on block condition and whether we need to rebuild the buck. We schedule by the job, not the hour, so the crew is not rushing to the next call.
We stock Therma-Tru-compatible installation hardware, flashing, and common seal profiles on every North Palm Beach crew vehicle. Complete window units ship from the regional distribution center in 5-10 business days for standard sizes, 2-3 weeks for custom geometry. We confirm lead time in the written scope before you sign.
Sightline Windows & Doors North Palm Beach is independently owned and operated under the Haven Standard. We are not affiliated with Therma-Tru Corporation; we are an authorized independent installer with access to OEM and quality aftermarket components across eight manufacturer lines including PGT, CGI, and CWS.
Written by Sonia Raman, Owner, Sightline Windows & Doors North Palm Beach at Sightline Windows & Doors North Palm Beach, serving North Palm Beach and nearby areas.