Each system offers a rainproof finish. The louvre blades are designed to interlock when closed to create a seal and keep rain out. Water is carried away by deep channels in each louvre leading to a surrounding gutter. This drainage system avoids leakage and residual water spray into the space below it. During heavy rainfall there may be some splashing around the gutter but for the most part, the louvre system will still keep you comfortable and dry. There is no need to run inside when the weather turns!