This Flat Roof Window is situated on the Ground Floor Extension at this property. Due to its substantial size – 5m x 1,4m – the installation took place on site. Once we positioned the aluminium frame correctly, we than applied one of 2 coats of a special weatherproofing elastomeric silicone sealant. Second layer of it was applied after the first dried. The unusual feature of this project is that the skylight has glass panes with black borders. Beautiful.