Factory-glazed curtain wall and window wall that arrive on site with the glass already installed — cutting time-to-water-tight 40-60% on Nashville multifamily and hotels. Built for tight schedules and small field crews.
Preglazed systems are glazing assemblies where the glass is installed into the frame at the manufacturer's plant before the unit ships. The unit arrives on site ready to set to anchors, so the field crew skips loose-glass installation — the opposite of site-glazed, where empty frames are filled with glass on the jobsite.
Every commercial glazing system has to get the glass into the frame somewhere. The only question is where — in a climate-controlled factory before the unit ships, or on the open deck after empty frames are hung. That single decision cascades through the whole job: how many glaziers you need on site, how long the building sits open to weather, how much rework you absorb, and when the structure finally goes water-tight.
Preglazed front-loads the glazing labor into the plant, where it happens under controlled conditions with factory quality control. Site-glazed keeps that labor on the jobsite, where it competes for crane time, deck space, and good weather. Neither is universally better — but on the schedule-driven projects filling up Nashville right now, the math usually favors preglazed.
Glass is installed into the frame at the factory before the unit ships. Units arrive complete and are set to anchors on the deck.
Smaller field crew · faster dry-in · controlled shop conditions · less rework
Frames ship empty and a glazier installs each lite on the jobsite, floor by floor, after the frames are set.
More field labor · weather-exposed · longer to water-tight · flexible for custom openings
The metric that decides which method wins is “time-to-water-tight” — the number of days between starting the facade and the building being closed enough to start interior trades. On a site-glazed job, that clock runs through frame erection plus a separate, weather-dependent glazing pass on every floor. On a preglazed job, setting the unit and glazing the unit are the same operation, so the clock runs shorter and the interior trades start sooner. On a typical Nashville multifamily or hotel project, that compression is where the 40-60% time-to-water-tight reduction comes from — and it stacks on top of every floor.
Nashville construction is running hot. Hotel demand and the multifamily boom keep the field labor market tight through 2024-2026, and glazing labor is one of the first trades to bottleneck. Preglazed bypasses that bottleneck:
Site glaziers in Tennessee often book 12-16 weeks out. Preglazed delivery lets a GC dry in the building without waiting in that queue. On a multifamily tower or a hotel where every week of the schedule carries financing cost, that head start is not a convenience — it protects the certificate of occupancy date and the day the building starts earning revenue. The trade-off is that the work moves upstream: decisions that a site-glazed job could defer have to be made early, which is exactly where ACG's pre-engineering process earns its place.
The preglazed advantage is general, but a few conditions specific to the Tennessee market sharpen it. Nashville's building boom, the state's energy code, the realities of shipping glass through the storm belt, and the local labor crunch all push the same direction:
Nashville's hotel demand and multifamily boom put projects on aggressive schedules. Preglazed delivery protects the dry-in milestone.
IBC 2018 thermal standards favor factory-built insulating glass units, where shop QC controls the seal and the spacer better than field assembly.
Tornado-belt handling and transit fragmentation are managed by proper factory crating, so units arrive intact and ready to set.
With site glaziers booked 12-16 weeks out, preglazed bypasses the queue and gets a smaller crew dried in on schedule.
The thermal point is worth dwelling on. IBC 2018 and Tennessee's energy code push commercial buildings toward thermally broken framing and high-performance insulating glass units, and an IGU built in the factory is simply more reliable than one assembled in the field. The seal, the spacer, the desiccant, and the argon fill are all controlled in the plant, where humidity and dust are managed and the unit is inspected before it leaves. That same factory environment is what makes the glazing repeatable across hundreds of identical openings on a tower — the kind of consistency a field crew working floor by floor in changing weather cannot match.
The objection GCs raise first is transit: if the glass is already in the unit, what happens to it on the truck through the storm belt? The answer is engineering, not luck. Preglazed units are crated and braced to carry the glass as a structural element, and the framing systems built for factory glazing are designed for the handling and lifting loads from the plant floor to the anchor. Done right, the controlled trip from a factory to a Nashville jobsite is gentler on the glass than repeated handling, staging, and re-staging of loose lites across an active deck. ACG specifies the crating and the lift plan as part of the package, so the units that arrive are the units that go up.
Not every glazing system is built to ship preglazed — the framing has to be engineered to carry the glass through transit and lifting without losing its seal or its alignment. ACG sources preglazed systems from our authorized manufacturer partners and shows the factory glazing sequence in every submittal, so the GC and the AHJ both see exactly how the units are built before they ship. See the full lineup on our manufacturer partners page.
The ES-7000 unitized curtain wall is the workhorse for tower facades — complete factory-glazed units that a crew sets floor by floor and that reach high design pressures, which matters when a Nashville high-rise has to satisfy both the energy code and the wind load. Window wall, by contrast, spans slab-edge to slab-edge and suits the podium and mid-rise multifamily that fills out the rest of the Nashville pipeline. Choosing between them — and deciding which openings each one covers — is part of the pre-engineering conversation, not a detail left to the field. ACG runs that selection against the actual elevations rather than defaulting to one system for the whole building.
Preglazed is not the answer for every opening, and a glazier who pretends otherwise will cost a GC money. We compete on speed and reliability, not on selling a method that doesn't fit the building — so we tell GCs plainly where preglazed stops making sense:
ACG flags these conditions during pre-engineering, so the schedule and budget are built on the right method from day one. On most real projects the answer is a mix: the repetitive tower or podium goes preglazed for speed, while the articulated entry, the oversized lobby glass, and the irregular openings stay site-glazed for fit. Calling that split correctly at the submittal stage is what keeps the schedule honest later.
Preglazed only delivers its schedule advantage if the front of the job is run with discipline. ACG treats the factory glazing sequence as a deliverable in its own right, not an assumption. Here is how a Tennessee preglazed package moves from drawing to dried-in:
This is where being owner-led matters. Connor reviews every Tennessee project personally, so the pre-engineering call — what ships preglazed, what stays site-glazed, and how the delivery sequences against the crane — is made by someone accountable for the result, not handed down a chain. The custom tools ACG built to run its own operations, including job costing and subcontractor coordination, keep that plan tied to the live schedule rather than a static bar chart, which is how a preglazed package stays honest from order release through final perimeter seal.
“On a Nashville hotel or multifamily tower, the schedule is the project. We pre-engineer the units with the manufacturer so the field crew sets and seals instead of glazing lite by lite — and the building dries in weeks sooner.”
Repetitive floor-to-floor facades are the ideal preglazed condition — set units fast, dry in fast.
Marriott, Hilton, Hyatt, AC, and Element brands run on tight openings. Preglazed protects the opening date.
Large, repetitive curtain wall elevations on corporate builds suit factory-glazed unitized systems.
Standardized storefront and window-wall packages ship preglazed for fast, repeatable retail rollouts.
What ties these together is repetition. The more a building repeats the same opening — floor after floor of identical hotel rooms, apartment units, or curtain-wall bays — the more a factory can amortize its setup and the more a field crew benefits from setting the same unit over and over. That is why the preglazed conversation in Tennessee usually starts with the multifamily and hospitality work that dominates the Nashville pipeline, then extends to the corporate and retail builds that share the same repetitive geometry.
Preglazed shifts work to the front of the schedule, so a few logistics items have to line up early. Our glazing spec checklist covers the full handoff:
None of these are obstacles — they are simply decisions that move to the front of the job. Because ACG runs every package through Procore, the lead-time, crane, staging, and delivery sequence all live in the same system the GC uses to drive the schedule, so the preglazed handoff is coordinated against the real construction sequence rather than handled as a separate conversation. Get these four items aligned at the submittal stage and the field portion of the work becomes the short, predictable part of the schedule it should be.
Let's talk preglazed. Send us your plans and Connor reviews every Tennessee project personally — returning a preglazed delivery plan, system recommendation, and Division 08 scope within 48 hours.
Related: Tennessee commercial glazing · Nashville · Laminated glass