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VELUX recessed flashing (with BDX 2000F Insulation Collar) to provide drainage round the roof window. For use with slate up to 8mm thick (not interlocking). Roof pitch between 20-90 degrees Suitable for slate up to 8mm thick Provides a sleek and streamlined finish as the window is installed lower in the roof Suitable for roof pitches between 20-90° Includes BDX collar which insulates around the roof window frame, reducing heat loss and eliminating cold bridges Highly durable Supplied with BFX underfelt collar and transverse drainage gutter