Skyseal | Bespoke 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.

The current UK Building Regulations establish specific U-value requirements for various building elements to ensure compliance with energy efficiency standards. 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 glass roof Lantern is delivered in kit form, ready to mount onto a weathered builder's upstand. Watch our step-by-step Skyseal glass roof lantern installation video to get started.

Our Skyseal Glass Roof Lantern can be manufactured to any RAL colour. Three standard colours are available at no extra cost, and you can specify different colours for internal and external frames:

• Anthracite Grey (7016)

• Matt Black (9005)

• Satin White (9010)

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

Yes, the Skyseal Glass Roof Lantern can be custom-made to your required dimensions, though bespoke sizing may carry additional costs.

The Skyseal Glass Roof Lantern is one of the UK's most thermally efficient double-glazed roof lanterns. With a complete roof U-value of 1.25 W/m²K, it keeps your home comfortable year-round.

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