How Is a Rooflight Made?
Natural light has the power to completely transform a space. Whether you’re renovating a home, extending a kitchen, or designing commercial buildings, roof lights are an excellent way to increase daylight, improve mood, and enhance the overall visual appeal of a property.
Modern rooflights combine durable materials, advanced glazing technologies, and precision manufacturing techniques to achieve outstanding thermal performance, weather resistance, and aesthetic appeal. From sleek frameless skylights to elegant roof lantern designs, every rooflight goes through a detailed manufacturing process before it reaches your roof.
This blog will explore how rooflights are made. Looking at the materials used, the manufacturing process, and the key factors that influence performance, lifespan, and energy efficiency.
What Is a Rooflight?
A rooflight, sometimes referred to as a skylight or roof window, features a glazed unit built directly into a roof to bring natural sunlight and daylight into the space below.
Unlike traditional windows fitted into walls, rooflights sit overhead at the highest point of a building, allowing natural light to flow deeper into a room and creating a brighter, more open interior.
Rooflights are available in a wide range of styles, including:
Custom lanterns maximise natural light and can become a stunning architectural feature within both residential properties and retail spaces.
Step 1: Designing the Rooflight
Every rooflight begins with a carefully planned design process. Manufacturers consider various factors to ensure the finished product is suitable for the intended application.
Some of the key factors include:
- Floor area and room size
- Desired levels of natural light
- The existing structure of the building
- Thermal efficiency targets
- Roof pitch and construction
- Installation requirements
- Safety regulations
Designers use specialist software to create accurate drawings while optimising both the aesthetic appeal and thermal performance of the final product.
Step 2: Selecting the Materials Used
The materials used play a significant role in the durability, appearance, and energy efficiency of rooflights.
Rooflights are made from:
- Aluminium
- Steel
- uPVC
- Glass
- Polycarbonate
- Acrylic sheets
Aluminium Rooflights
Aluminium rooflights remain one of the most popular choices in the UK market. The frames are lightweight, durable, corrosion-resistant, and low maintenance. They are extruded and machined for structural integrity, allowing manufacturers to create slim sightlines that maximise glass area and daylight.
Many premium rooflights use thermally broken aluminium frames, helping reduce heat transfer and improve insulation.
Here at UK Rooflights Online, we offer a range of aluminium flat and frameless rooflights. All can be made to measure with a range of glass options to suit your project. We also now offer the rooflight kerb, an innovative rooflight solution to help you easily meet building regulations.
Step 3: Manufacturing the Rooflight Frame
The rooflight frame forms the backbone of the entire product.
For aluminium rooflights, large aluminium billets are heated and pushed through specialist dies during a process called extrusion. This creates the precise frame profiles required for the rooflight.
The frame sections are then:
- Cut to size
- Machined for fixings
- Prepared for glazing
- Tested for accuracy
Many modern rooflight frames incorporate thermal breaks and rubber gaskets to stop air and water leaks. These thermally broken systems significantly improve thermal efficiency and help achieve low U values.
Step 4: Producing the Glass
The glass used in rooflights differs significantly from standard window glass. Most rooflights use insulated glazing units made from toughened and laminated glass.
The manufacturing process begins by cutting large sheets of glass to precise dimensions.
The glass edges are polished to remove micro-cracks before further processing.
Toughened Safety Glass
High-grade safety glass is typically toughened or laminated. Toughened glass is five times stronger than regular glass, making it ideal for applications positioned overhead. The toughening process involves heating the glass to extremely high temperatures before rapidly cooling it.
Benefits include:
- Increased safety
- Enhanced strength
- Improved durability
- Better resistance to impact
Laminated Glass
Laminated glass consists of multiple layers bonded together with a protective interlayer.
If broken, laminated glass holds shards in place when broken, providing an additional level of safety for occupants below.
Low emissivity coatings are often applied to the glazing to help reflect heat back into the building and improve energy efficiency.
Step 5: Assembly of the Rooflight
Now its time for assembly to begin.
Glazing is fitted into a pre-fabricated frame for roof mounting. Highly skilled technicians ensure each pane sits correctly within the rooflight frame.
During assembly, manufacturers install:
- Rubber gaskets
- Weather seals
- Thermal breaks
- Drainage channels
The result is a weather resistant unit that protects against water ingress and air leakage.
Roof Lanterns
A roof lantern creates a raised glazed structure that sits above the roof surface. These products are popular because they bring diffuse light deep into the interior while creating a stunning focal point.
Installation of roof lanterns can often be completed in under one hour once the supporting up stand has been prepared.
Quality Testing
Before being shipped, finished rooflights undergo checks for optical clarity and structural load performance.
Manufacturers check:
- Glazing quality
- Seal integrity
- Thermal performance
- Structural strength
- Visual appearance
Quality testing includes water testing to ensure the product is watertight. Products are also subjected to rigorous weather testing to ensure resistance against wind, rain, and water ingress.
Installation Methods
Installation procedures vary based on rooflight type and model.
For most flat roof installations, a builder’s up-stand is required. The up stand elevates the rooflight above the roof surface and helps prevent water penetration.
Depending on the product and project complexity, rooflights typically take a few hours to install.
Professional installation is always recommended to maximise lifespan, thermal performance, and weather resistance.
The Importance of a Rooflight Kerb
A rooflight kerb, also known as an up stand, is a vital part of any rooflight installation. Positioned between the roof and the rooflight frame, it creates a raised platform that supports the rooflight while helping to prevent water ingress and improve drainage on a flat roof.
Manufactured from durable, insulated materials, rooflight kerbs help enhance thermal performance, reduce heat loss, and contribute to a more energy-efficient installation.
At UK Rooflights Online, our rooflight kerbs have been designed to work seamlessly with our range of aluminium rooflights, enabling long-lasting performance and enhanced insulation.
How Long Do Rooflights Last?
Lifespan varies depending on materials, installation quality, and environmental conditions. Expected lifespans include:
- Aluminium and steel rooflights can last up to 30 years
- uPVC rooflights may need replacement in 10-15 years
Installation quality significantly affects rooflight lifespan, making proper fitting essential.
How Is A Rooflight Made?
The process goes far beyond simply fitting glass into a frame. Manufacturers engineer aluminium frames, incorporate thermally broken systems, assemble high-performance double glazed units, apply low emissivity coatings, and carry out rigorous quality testing to ensure every rooflight delivers outstanding durability, thermal performance, and energy efficiency.
Whatever your project is, understanding how a rooflight is made helps you make an informed decision. By knowing what goes into the manufacturing process, you can confidently choose a rooflight that offers the right balance of natural light, performance, style, and long-term value for your project.
At UK Rooflights Online, our range of flat rooflights, frameless rooflights and roof lanterns are designed to maximise natural light, reduce artificial lighting, improve thermal efficiency, and create bright, inviting spaces. If you’d like expert advice on the best glazing options for your project, contact our team today.
