This extension kerb for flat roof windows allows installation in warm, grass or sedum roof constructions. It raises the polycarbonate dome from the base of the kerb by 150mm. The increase in height does not allow the snowfall to reach the top. This VELUX extension kerb is efficient at increasing the amount of natural daylight underneath a flat roof. 10 year guarantee.
- Increases the height of the roof windows
- Integrates with roof material
- Highly efficient
- Allows rainwater to drain away
- Additional flexibility
- Ease of use