Prior to us fitting your new Ultrawarm Skylight we will require a raised timber kerb flashed to the main roof. The dimensions we provide will be external timber kerb. We recommend this kerb to be 70mm wide and 150mm high.Our roof rafters will then overhang this kerb by 90mm.The weather-proofing of the roof should extend over the top of the timber kerb.
The Ultrawarm Skylight is suitable for roof lanterns from 1500mm by 1000mm to 2000mm by 4000mm external sizes.
The thermal performance has been optimised to make it suitable for extensions in domestic properties. Typical U value with 1.1 glass for a 1000mm wide x 2000mm long rooflight is 1.4 W/m2K. The units are glazed with 24mm double glazed units as standard.