What is a U-value?
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 Rubber4Roofs 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.
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Korniche | Bespoke Contemporary Roof Lantern
£962.08 £801.73 -
Korniche | Bespoke Pyramid Roof Lantern
£796.28 £663.57 -
Brightside Skylights | Frameless Flat Glass Skylight
£186.00 £155.00 -
Brightside Skylights | Flat Glass Fixed Skylights
£379.92 £316.60 -
Brightside Skylights | Flat Glass Opening Rooflight
£567.24 £472.70