Coupled Combination Slate Flashing (EKL MK08 0021E) with a 100mm Gap for profiles up to 8mm ThickCombination slate flashings. VELUX provide a range of flashing options to suit your roofing needs. Flashings for installing two roof windows side by side into slate up to 8mm thick with a 100mm gap. Not for interlocking slate. Roof pitch between 15 and 90.