MY basketWhen it comes to glazing for roof lights and roof lanterns, safety and performance are two things you can’t compromise on. That’s where toughened safety glass comes in, a specialist type of glass designed to withstand impact, temperature changes, and everyday wear far better than ordinary glass.
At Lantern Superstore, we use toughened safety glass across our entire product range, ensuring that every roof light or roof lantern we manufacture meets the highest standards of strength, durability, and safety. But what exactly is toughened glass, and why is it so important for overhead glazing?
Understanding Toughened Safety Glass
Toughened safety glass, sometimes called tempered glass, is a specially processed glass that has been heat-treated to increase its strength. During manufacturing, standard (annealed) glass is heated to around 620°C and then rapidly cooled using high-pressure air.
This process creates balanced internal stresses: the outer surfaces go into compression, while the inner layers remain in tension. The result? A piece of glass that is around four to five times stronger than standard glass of the same thickness.
If toughened glass does break, which is rare, it shatters into small, blunt granules rather than sharp, dangerous shards. This safety feature significantly reduces the risk of injury, which is especially crucial in areas where glass is installed overhead, like roof lights and roof lanterns.
Why Is Toughened Glass Used in Roof Lights and Roof Lanterns?
Roof glazing is constantly exposed to the elements. From heavy rain and high winds to sudden temperature changes and falling debris, the glass in a roof light or lantern has to perform under tough conditions.
Here’s why toughened safety glass is the perfect choice:
- Impact Resistance
Roof lights and roof lanterns are exposed to impacts from hail, debris, and even occasional foot traffic during maintenance. Toughened glass is far more resistant to these forces than standard glass, reducing the risk of cracks and breakage. - Thermal Strength
Because roof glazing is directly exposed to sunlight, it’s prone to rapid heating and cooling. Normal glass can crack under thermal stress, but toughened glass is specifically designed to handle these temperature fluctuations without failing. - Safety and Compliance
Building regulations (including BS EN 12150 in the UK) require safety glazing for any overhead applications. Toughened glass meets and exceeds these standards, making it the go-to choice for compliance and peace of mind. - Longevity and Durability
With its superior structural integrity, toughened safety glass maintains clarity, shape, and strength over time, ensuring your roof light or roof lantern continues to perform beautifully for years.
How Is Toughened Glass Made?
The toughening process is what gives this glass its unique properties. Here’s a simplified overview:
- Cutting and Shaping
The glass starts life as ordinary float glass. It’s cut to its final size and shape before the toughening process, once toughened, it can’t be trimmed or altered. - Heating
The glass is placed inside a specially designed toughening furnace and heated uniformly to over 600°C. - Rapid Cooling (Quenching)
Immediately after heating, the glass is blasted with jets of cool air. This rapid cooling cools the surface layers quickly while the inner core cools more slowly, creating the distinctive stress pattern that gives toughened glass its strength. - Quality Testing
Each piece of glass is carefully checked for optical quality, flatness, and strength before it’s approved for use in roof glazing systems.
Toughened vs. Laminated Glass
While both are types of safety glass, toughened and laminated glass perform differently. Here’s how they compare:
Toughened glass: Stronger and more heat-resistant. If it breaks, it crumbles into small pieces. Ideal for areas where high strength and impact resistance are required, like roof lights and lanterns.
Laminated glass: Consists of two or more panes bonded by a plastic interlayer (usually PVB). When broken, the glass fragments stick to the interlayer rather than falling away. It’s excellent for sound insulation and added security but not as heat-resistant as toughened glass.
In many modern roof light systems, a combination of both is used, for example, a toughened outer pane for strength and a laminated inner pane for safety and UV protection.
Benefits of Toughened Safety Glass in Roof Lights
When you choose roof lights or roof lanterns manufactured with toughened glass, you’re choosing:
- Enhanced Safety – Reduced injury risk from breakage.
- Increased Strength – Up to five times stronger than standard glass.
- Thermal Performance – Withstands temperature extremes.
- Optical Clarity – Perfect for bringing natural light into your home or workspace.
- Weather Resistance – Durable against rain, snow, and strong winds.
- Peace of Mind – Fully compliant with UK building regulations.
At Lantern Superstore, every product is engineered with these advantages in mind, using only premium-grade toughened safety glass that’s carefully inspected before installation.
Applications in Modern Roof Design
Toughened glass isn’t just a technical requirement, it’s an enabler of modern architectural design. Its strength allows for larger, cleaner panes, reducing the need for heavy framing and letting in more natural light.
That’s why it’s the foundation of our frameless roof lights, flat roof lanterns, and contemporary roof glazing systems. Whether you’re looking to flood a kitchen extension with daylight or create a showpiece glass roof for a commercial space, toughened glass makes it possible.
It also works seamlessly with advanced coatings and treatments, such as:
- Solar control coatings to reduce heat build-up.
- Self-cleaning glass that uses UV light to break down dirt.
- Low-E (low emissivity) coatings to improve energy efficiency.
Maintenance and Care
While toughened glass is highly durable, proper maintenance ensures it stays looking and performing its best.
- Clean regularly using a soft cloth and mild, non-abrasive cleaner.
- Inspect seals and frames to prevent water ingress.
- Avoid impact with hard or sharp objects.
With minimal care, toughened safety glass will retain its clarity and strength for decades, making it an excellent long-term investment.
Why Choose Lantern Superstore?
As a trusted manufacturer of roof lights and roof lanterns, we understand that the glass is the heart of every design. That’s why all our products are made using precision-engineered toughened safety glass, rigorously tested to meet or exceed UK and European safety standards.
Every unit is built to perform, combining strength, style, and sustainability. Whether you’re a homeowner, architect, or builder, our team works closely with you to deliver bespoke roof glazing solutions that transform spaces with light while ensuring absolute peace of mind.
Final Thoughts
Toughened safety glass is the invisible hero of modern roof design, combining strength, safety, and beauty in equal measure. From its advanced manufacturing process to its impressive performance in real-world conditions, it’s easy to see why it’s the standard choice for roof lights and roof lanterns across the UK.
When you choose Lantern Superstore, you’re not just choosing glass, you’re choosing confidence, quality, and roof lights and roof lanterns you can trust. Want to find out more? Speak to our team on sales@lanternsuperstore.co.uk today.
