Modern attic design increasingly focuses on maximising natural light and visually opening up the space. One of the most effective and functional solutions is to combine a roof window with a vertical window in a knee wall. This combination creates a larger glazed area, improves the view of the surroundings and gives the interior a unique lightness. However, to ensure the overall effect is not only attractive but, above all, safe and tight, a specialized flashing is essential. FAKRO flashings for L-shaped combinations have been designed for the most demanding projects – those that connect the roof with a vertical wall without visible gaps and without the risk of leaks. This solution is aimed at investors and designers who prioritise durability, aesthetics and meticulous attention to detail.