Skyseal | Laminated Glass Roof Lantern Pyramid

U-value, or thermal transmittance, is a crucial measurement that quantifies how effectively a building element prevents heat from escaping or entering a structure. Measured in Watts per square meter Kelvin (W/m²K), this standardised value is particularly important when evaluating the thermal performance of skylights and roof windows.

The U-value specifically indicates the rate of heat transfer through a building component – in this case, a Skyseal skylight. The lower the U-value, the better the thermal insulation properties and the more energy-efficient the skylight will be. This translates directly to improved temperature regulation in your home and potential savings on heating and cooling costs.

Current UK Building Regulations establish specific U-value requirements for various building elements to ensure energy efficiency standards are met. For skylights and roof windows, existing dwellings must achieve a maximum U-value of 2.2 W/m²K, while new construction projects typically require more stringent values between 1.2 and 1.7 W/m²K, depending on the specific application.

Our premium skylight range exceeds these regulatory requirements, with models featuring advanced glazing technologies that deliver exceptional U-values as low as 0.9 W/m²K in some configurations. This superior thermal performance contributes to reduced energy consumption, a smaller carbon footprint, and enhanced comfort through consistent interior temperatures regardless of external weather conditions.

The Skyseal Laminated Glass Roof Lantern is custom-made to your exact sizes. We work from external measurements and recommend your upstand is a minimum of 85mm wide.

To calculate your required size, measure the length and width from the outside edge of your timber upstand and fitted waterproof membrane.

The Skyseal Laminated roof lantern is engineered to ensure the installation is a quick and easy operation, ensuring your home becomes secure and water tight in the minimum time possible.

The Skyseal Laminated Lantern is delivered in kit form and leaves the factory with all components checked and quality controlled. It is designed for simple mounting direct to a weathered builder’s upstand. Your builder or installer will have a comprehensive installation guide with all dedicated parts required for a speedy installation.

Our Skyseal Laminated Lantern can be manufactured to any RAL colour. However, there are three standard colours which are available at no extra cost. You can also specify different colours internally and externally.

• Anthracite Grey (7016)

• Matt Black (9005)

• Satin White (9010)

The Skyseal Laminated Lantern is available in two standard glass tints: Clear Self-Clean and Blue Solar Self-Clean. Please view the Skyseal Roof Lantern Datasheet for further details.

Yes, the Skyseal Roof Lantern can be custom made to your required sizes but may come with extra costs.

The Skyseal Laminated Roof Lantern is one of the UK's most thermally-efficient double-glazed lanterns. With a complete roof U-value of 1.25W/m2K, Skyseal provides your home with a room that’s comfortable all year round.

Yes, Skyseal Roof Lanterns are fully compliant to Part L Building regulations.