Lantern roof ideal for bringing natural light into a property, as well as adding a sense of space. Suitable for use with a flat roof, on a project such as a single storey extension. Supplied with blue roof glass. Internal Frame: White / External Frame: White 24mm Argon-Filled Low E Toughened Blue Safety Insulating Glass 10 Year Manufacturer's Guarantee (T&Cs Apply) U-Value: 2.0W/m²K Unvented Internal Frame: White / External Frame: White 24mm Argon-Filled Low E Toughened Blue Safety Insulating Glass 10 Year Manufacturer's Guarantee (T&Cs Apply) U-Value: 2.0W/m²K Unvented