When homeowners and building professionals ask how strong a glazing system is, they’re usually thinking about the glass. That’s the right instinct—but it’s only part of the picture. The full answer is quite a bit more layered than most people expect.

The strength of a glazing system is a product of every component working together: the glass panels, the aluminium hardware, the track and hinge mechanism, the structural connection to the building, and the engineering that ties it all together.

Lumon’s glazing system has been refined over more than 35 years of real-world installation across four continents and some of the world’s most demanding climates. Here’s what that means in practice.

Three Types of Glass, and Why Lumon Chooses Tempered

Not all glass is the same, and understanding the differences matters when evaluating any glazing system. There are three types to know: annealed, heat-strengthened, and tempered. Every pane of glass starts life as annealed glass, which is the base material produced when sand is melted into a flat sheet.

What happens after that determines how strong it is, and critically, how it behaves if it breaks.

• Tempered (Toughened)
  • Super-heated to around 650°C then rapidly cooled, pulling all compressive strength toward the centre of the pane.
  • About 4 times stronger than annealed glass and 2 times stronger than heat-strengthened.
  • Breaks into thousands of small, blunt pebble-like chunks.
  • Significantly less dangerous than large shards.
• Heat-Strengthened
  • Heated to lower temperatures than tempered glass.
  • Stronger than annealed, but not as strong as tempered.
  • Has some of the same surface compression properties, but less so.
  • Breaks into larger shards than tempered.
  • Can be dangerous if someone is nearby during breakage.
• Annealed
  • All glass starts here.
  • Fragile compared to treated options, with no added compressive strength.
  • On its own, it is the weakest and most dangerous of the three when broken.
  • Breaks into large, sharp shards, like a knife.
  • Can be made safer through laminating (not stronger).

One important nuance about tempered glass that’s worth understanding: while it’s the strongest of the three types, its strength is concentrated toward the centre of the pane. You could strike the middle of a tempered glass panel with significant force and it’s likely to hold, but the edges and corners are the weak points. A relatively light tap to a corner or edge carries a much higher chance of breaking it. This is why installation precision and proper framing matter: the edges of tempered panels need to be handled and housed carefully to protect them from incidental contact.

The breakage characteristic is what earns tempered glass its “safety glass” designation. When it does break, the internal tension causes the entire pane to shatter at once into thousands of very small, blunt-edged chunks; behaving more like falling pebbles than a shard of glass. Compare that to annealed glass, which breaks into large, razor-sharp pieces that can cause serious lacerations. This is why building codes in many jurisdictions require tempered or laminated glass in balcony and terrace applications.

Laminated glass—which sandwiches a safety film between two sheets of annealed glass—is worth understanding separately. It doesn’t make the glass any stronger; two sheets of 4mm annealed glass with a laminate film between them is still as weak as a single 4mm sheet under impact. What the laminate does is hold the broken pieces together, keeping shards adhered to the film and the opposite sheet rather than falling freely. This makes it safer in breakage without increasing strength. Lumon uses laminated glass in select railing applications where post-breakage containment is the priority.

• 4 times stronger than annealed glass, and 2 times stronger than heat-strengthened
• 6–12mm tempered glass thickness options, selected per project based on wind loads and height
• Up to 13dB noise reduction on balconies; perceived noise is approximately halved

Lumon uses tempered glass as the primary glazing material across its balcony and terrace systems, in 6mm, 8mm, 10mm, and 12mm thicknesses. With the right thickness determined by a project-specific structural calculation based on panel size, building height, and wind load requirements. Heat-strengthened glass is used occasionally for railing cladding applications where the performance requirements differ.

Built for the Elements

A glazing system installed on a balcony or terrace faces real-world forces that a standard window or door does not. Wind pressure is the defining variable; it varies significantly depending on building height, geographic location, and exposure. Lumon’s system is designed to handle this variability rather than work around it.

Lumon’s glazing provides meaningful protection from wind, rain, and the noise of the surrounding environment. The panels can be secured in position to prevent movement in wind, and silicone and rubber sealing profiles cover the gaps between the glazing and the surrounding structures to manage water, wind, and sound.

It’s worth being clear about what the system is and isn’t: Lumon terrace glazing is not a fully airtight enclosure. Due to necessary ventilation gaps between panels, some rain or snow may enter in certain conditions. It is a highly effective weather buffer rather than a sealed room, and that distinction matters when setting expectations.

Strength That Holds Over Time

Lumon was founded in Finland and developed its glazing systems in one of the most demanding climates in the world: severe winters, significant temperature swings, and high wind exposure across much of the country. That engineering heritage is embedded in every system: materials selected for long-term outdoor performance, components sized conservatively, and manufacturing tolerances kept tight.

Strength in a glazing system is ultimately about confidence that the glass will :

• Hold up to the conditions it faces
• The hardware will continue to operate reliably year after year
• The structural connection to the building has been engineered properly for the specific load requirements of the installation.
  

Lumon’s system delivers all three, backed by the kind of track record that only comes from decades of real-world performance across the full range of climates that Canadians encounter.

Discover how your home can benefit from our innovative solutions. Contact us today to speak with a Lumon design consultant and claim your free quote on a new Lumon glazing system for your home.