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A glazed atrium skylight and entrance canopy where post-breakage retention was non-negotiable: jumbo laminated panels up to 3300×20000mm, PVB and SGP interlayers, heat-soak tested and anti-slip fritted for safe overhead use.
☀️ Overhead & Sloped
🛡️ 12.76 / 17.52 PVB-SGP
🔥 HST 554°F × 4hrs
📏 Laminated 3300 × 20000mm
Atrium skylight + entrance canopy, mixed-use civic building
Copenhagen, Denmark (cold climate, snow load)
Overhead sloped skylight + horizontal canopy
~3,400 m² overhead glazing, largest panel ~25 m²
With people walking beneath the canopy and gathering under the atrium, this was life-safety glazing. The glass had to retain integrity after any conceivable breakage, shed water reliably, and be supplied in jumbo panels to keep the ceiling grid clean.
Non-negotiable for overhead use — monolithic tempered alone was ruled out.
Spans up to ~3m across a sloped support grid, demanding jumbo laminated supply.
Canopy top surface needed anti-slip rating plus reliable rainwater run-off.
Dark frit + cold climate raised thermal-gradient concerns on the outer lite.
| Construction | Make-up | Used in | Why |
|---|---|---|---|
| 12.76 PVB | 6 + 1.52PVB + 6 | Standard sloped zones | Cost-effective post-breakage retention |
| 17.52 PVB | 8 + 1.52PVB + 8 | Higher-load spans | Stiffer, better deflection control |
| 13.52 SGP | 6 + 0.89SGP + 6 | Walk-adjacent / critical | Superior stiffness & residual strength |
Tempered, ceramic frit anti-slip pattern where required
PVB 1.52mm standard, SGP for critical zones
Tempered, clear
Thickness and interlayer are selected against design loads per ASTM E1300 / EN 1991. The values above are a starting point, not a substitute for structural engineering.
Cut & edgework→Temper (Grenzebach)→Heat soak test 554°F×4hrs→Frit print (canopy top)→Laminate (PVB/SGP)→Autoclave→Crate & ship
A spontaneous break in a 3000×8000mm overhead panel is disproportionately costly — one failure can halt an entire space below. Heat soaking at 554°F (290°C) for 4 hours accelerates nickel sulphide inclusion breakage in the factory, reducing field breakage risk to below 0.01%. Jumbo Glass Group's batch breakage rate is ≤0.08%, with SGS batch reports and a 20-year breakage insurance cover.
Rule: all cutting, edgework, drilling and frit printing must be completed before tempering and lamination. A laminated panel cannot be re-cut after autoclaving.
| Feature | Specification | Purpose |
|---|---|---|
| Minimum slope | 5° (canopy), steeper for skylight per code | Prevent ponding & snow load |
| Anti-slip | Ceramic frit pattern on top surface | Slip resistance rating |
| Edge drainage | Perimeter gutter / gasket system | Controlled run-off |
| Sealant | Structural silicone compatible | Weather seal |
Slopes and frit coverage were confirmed against local building code and the project's slip-resistance class before production.
| Standard | Scope |
|---|---|
| EN 14449 | Laminated safety glass |
| EN 12150 | Toughened glass (each lite) |
| EN 14179 | Heat-soaked thermally toughened glass |
| BS 6262-4 | Glazing for buildings — safety |
| ASTM C1172 / E1300 | Laminated glass & load resistance (NA projects) |
Full EN 14449 / EN 12150 traceability, SGS batch reports and HST certification accompanied each crate.
Laminated construction accepted by building control for all overhead zones.
Jumbo panels minimised joints and support points across the atrium.
Frit + slope + drainage system cleared snowmelt without issues.
Outcome figures reflect this project's documented delivery; your project's load, span and drainage design must be engineered separately.
Overhead glazing lives or dies by two things: retention after breakage and panel count. Lamination handles the first; jumbo format handles the second — fewer panels mean fewer seals, fewer support points and a cleaner ceiling. The two together are why large atriums and canopies are almost always specified as jumbo laminated.
Size note: this project used monolithic laminated panels (3300×20000mm). A sealed IGU is limited to 3300×12000mm by handling and edge-seal integrity — but a laminated lite is only constrained by glass making and handling, so it reaches the full jumbo envelope.
3300 × 20000mm (11 × 65.6ft)
PVB 0.38–2.28mm · SGP
6.76–38mm+ laminated
Bystronic ±0.01″ · Grenzebach ±9℉ · HST 554°F×4hrs
Enterprise capability figures (max 3300×20000mm, ≤0.08% breakage) describe the production envelope, not this specific project's panels.
Span & support grid→Design loads (wind/snow/self-wt)→Deflection limit (L/60 etc.)→Interlayer (PVB / SGP)→Thickness (12.76 / 17.52 / 13.52+)→Frit / anti-slip?→HST required→Lock dims & RFQ
EN 14449 · EN 12150 · EN 14179 · BS 6262-4
ASTM C1172 · ASTM E1300 · ANSI Z97.1
AS/NZS 2208
Because it is overhead glazing: in the event of breakage the PVB or SGP interlayer holds the glass in place, preventing falling shards. This is a code and life-safety requirement, not an optional upgrade.
Standard sloped zones used 12.76mm (6+1.52PVB+6). Higher-load and walk-adjacent zones stepped up to 17.52mm (8+1.52PVB+8) or SGP-reinforced 13.52mm for superior post-breakage retention and stiffness.
The largest monolithic laminated panel measured 3300 × 20000mm. Unlike a sealed IGU — limited to 3300×12000mm by handling and edge-seal integrity — a laminated lite is only constrained by glass making and handling, so it reaches the full 3300×20000mm jumbo envelope.
A spontaneous break in a large overhead panel is disproportionately costly to remediate. Heat-soak testing at 554°F (290°C) for 4 hours precipitates nickel sulphide inclusions in the factory, reducing field breakage risk to below 0.01%.
A ceramic frit pattern was silk-screened onto the top surface to provide the required anti-slip rating, combined with a minimum 5° drainage slope to prevent ponding.
Yes. Provide span/deflection limit, slope, design loads (wind/snow/self-weight), interlayer preference, frit/anti-slip requirement, panel dimensions and target standard. We return feasibility, load calculation and FOB quote within 48 hours.
① Project location & climate · ② Span & support grid · ③ Design loads · ④ Deflection limit · ⑤ Interlayer (PVB/SGP) · ⑥ Thickness · ⑦ Slope · ⑧ Anti-slip/frit · ⑨ HST · ⑩ Standard · ⑪ Drawings · ⑫ Incoterm & port
Feasibility review + load/deflection calculation + BIM support + FOB quote within 48 hours.
📧 tomron1688@gmail.com ｜ 🌐 Upload drawings at jumbotemperedglass.com
Send your span, loads and slope — get a jumbo laminated specification with HST and anti-slip detailing within 48 hours.Request Specification Back to Projects
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Jumbo Glass Group · jumbotemperedglass.com · tomron1688@gmail.com
AS/NZS 2208
AS/NZS 2208
EN 1063:2000
EN 1063:2000
EN 1063:2000
EN 12150-2:2004
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