VELUX Window Flashings are essential for the installation of your roof window. The EDL 0000 Slate Flashing is suitable for installing one window into slates that are up to 8mm thick. Please note the EDL is not suitable for interlocking slate. If you do have interlocking slates you will need to use the EDW 0000. Suitable for roof pitches between 15°-90°. The flashings are available in a variety of sizes to suit your window and comes with the VELUX 10 year guarantee.