Oversized Glass Curtain Wall Systems
Dramatic floor-to-ceiling glazing, showroom fronts and atrium walls need glass that ordinary curtain walls were never designed for. Hanart engineers large-format glass systems — oversized IGUs, structural glazing, glass fins and point-supported glass — where panel size, weight and logistics are treated as design inputs, not afterthoughts.
Why oversized glass is a different engineering problem
Beyond roughly 3 metres, a glass panel stops behaving like a standard curtain wall unit. The glass gets heavier, the deflection budget gets tighter, heat treatment gets harder, and transport and lifting start to dominate the programme. Hanart treats each of those as an engineering discipline on its own.
Large-Format IGUs
Insulating glass units built at showroom and atrium scale. A 3.0 × 5.0 m IGU combines two or three panes of 10–19 mm glass, a 12–20 mm argon cavity and a warm-edge spacer — engineered so that thermal performance, acoustic performance and weight stay in balance with the structural system.
- Panels above 3,000 × 5,000 mm on request
- 10–19 mm panes, 12–20 mm cavities
- Low-E, laminated and fritted options
- U-value 1.0–1.4 W/m²·K typical
Structural Glazing (SSG)
Large glass panels bonded to the frame with structural silicone, so the facade reads as a continuous glazed plane without visible caps. SSG is the default route for oversized glass where the design demands a flush surface and maximum daylight.
- Continuous glass plane, minimal sightlines
- Structural silicone engineered per panel
- Works with heat-soaked tempered lites
- Coordination with the framing system
Glass Fins & Point Supports
Where a framed panel cannot carry the wind load — very tall glazing, wide spans without mullions — glass fins behind the main pane or spider fittings transfer load into the structure. This is the engineering that makes raking glass walls and cantilevered canopies possible.
- Laminated glass fins 12–19 mm+
- Spider / patch fittings in SS304/316
- Fin spacing verified by deflection analysis
- Full-height and cantilever options
Transport & Lifting Engineering
A 500–800 kg panel cannot be treated like a standard crate. Hanart plans dedicated A-frames, route surveys, crane reach and vacuum lifters as part of every oversized project — so delivery and installation risk is removed from the critical path.
- Dedicated stillages and A-frames
- Route & crane survey before fabrication
- Vacuum lifters with safety factor
- Sequenced site installation plan
Large-format glazing specification ranges
A practical reference range for oversized glass panels. Final values are engineered per project after structural, thermal and logistics review.
| Parameter | Typical Range | Design Note |
|---|---|---|
| Panel size | up to 3,000 × 5,000 mm (larger on request) | Above this size, plan logistics before confirming glass build-up |
| Glass thickness | 10–19 mm per lite | Thicker lites add weight; check crane and frame capacity |
| IGU cavity | 12–20 mm argon | Warm-edge spacer to reduce edge condensation |
| Thermal performance | U-value 1.0–1.4 W/m²·K | Low-E coating position set per climate and orientation |
| Acoustic performance | Rw up to 46 dB with acoustic PVB | Laminated interlayers for hotels, showrooms, towers |
| Solar control | SHGC 0.18–0.60 | Coating choice balances daylight and heat gain |
| Safety | Heat-soaked tempered + laminated | Nickel-sulphide risk reduced for large lites |
| Wind load | Engineered to local code | Deflection limit set for large spans (often L/60–L/90) |
How Hanart engineers oversized glass
Most installations of standard curtain wall glass can follow a catalogue. For oversized glass, the catalogue stops at the first design decision. Hanart follows a structured sequence on every large-format project so that size does not become a hidden risk.
- Size & weight audit — confirm the actual panel dimensions, glass build-up and unit weight, then check frame, anchoring and crane capacity against the local wind load.
- Glass processing review — heat-treatment limits, lamination, coating position and flatness tolerances are locked with the glass processor before fabrication starts.
- Deflection & stress analysis — structural silicone joints, fins or point supports are checked for the governing load case; the visible deflection budget is agreed with the architect.
- Logistics & lifting plan — route survey, A-frames, vacuum lifters, crane sequencing and site storage are planned and priced before the glass order is placed.
- Installation & verification — a written installation method statement is followed on site, with edge protection, temporary bracing and final checks on seal lines and glass alignment.
For projects where the design intent is a continuous glazed plane rather than a framed grid, the same sequence applies with structural glazing or point-supported systems — the analysis changes, the discipline does not.
Oversized glazing meets the rest of the envelope
Glass specification
Large-format panels use the same glass family as standard curtain walls — Low-E, laminated, fritted, fire-rated — but every property is verified at the actual build-up. Hanart coordinates glass selection with the framing so the two perform as one assembly.
- IGU, tempered, laminated, Low-E
- Coating position per climate
- Thicker lites for large spans
Framed curtain walls
For floor-to-ceiling and showroom glazing that stays within framed systems, Hanart engineers unitized and stick-built curtain walls with oversized mullions and reinforced frames sized for the heavier glass.
- Unitized & stick-built options
- Reinforced mullions for heavy panes
- Coordinated thermal breaks
Curved & free-form
Oversized glass meets its most demanding case on curved and raked facades, where every panel is processed to hold geometry within facade tolerance — including cold-bent lamination and curved tempering.
- Curved tempered glass
- Cold-bent IGU technology
- Frit patterns registered to geometry
Oversized glass questions, answered
In practice, anything beyond roughly 3,000 x 5,000 mm or an individual pane over 4-5 m in length crosses the threshold where standard glass processing, transport and lifting assumptions stop applying. Panel cost and lead time rise steeply above that size, and the specification must address heat-treatment, handling and installation strategy in detail.
Yes. Large-format insulated glass units use the same Low-E coatings, argon fill and warm-edge spacers as standard IGUs, so U-values of 1.0-1.4 W/m²·K remain achievable. The difference is control: larger panes need stricter tolerances, more careful coating placement and heavier glass, so thermal performance must be verified on the actual build-up, not assumed from a standard datasheet.
Oversized glass requires a dedicated logistics plan: A-frames and stillages designed for the panel weight, route surveys for bridge heights and turning radii, crane or gantry selection based on lift weight and reach, vacuum lifters with a safety factor, and a sequenced installation plan agreed with the site crane programme. Hanart plans all of these before fabrication starts.
When the design pushes panel width past roughly 3.5-4 m or demands a completely flush glazed surface at lobby and atrium scale, structural glass fins or point-supported glazing distribute wind load better and remove the visual grid. Framed large-format panels remain the simpler and usually cheaper route for typical floor-to-ceiling and showroom glazing.
Yes. Large panes add cost through thicker or processed glass, heat-treatment constraints, special transport frames, crane time and site handling. As a planning rule, panels beyond 3,000 x 5,000 mm can carry a cost premium over standard panels; the exact uplift depends on glass thickness, coating, lamination and logistics. Hanart prices this transparently at quotation stage.
Get a large-format glass engineering review
Send your drawings, panel sizes and performance targets. Hanart will confirm the glass build-up, logistics route and budget within 48 hours.