PVC Opstand 100x130 cm Curb type:Splayed curb 16 20 16 cm high for skylight flat roof window 1000 x 1300 Please note! Roof opening = 1200 x 1500 90 73 63 20 Double walled 90 73 63 20 Double walled Opal (A D) 2 Is this electric roof access with PVC curb 20 00 & iWindow2 flat roof window 1000 x 2000 mm Roof opening = daylight size the solution you are looking for Tailor the design to your specific project: choose a sloped version to capture the maximum amount of daylight and distribute it evenly throughout the room you choose flawless and completely watertight installation of your skylight or flat roof window