Water has a knack of finding any weakness. Sash window joints are no exception; that’s why we invented adhesive foam pads that seal the joints between the cill and the window frame.
Although protected locations may not need these pads, we set high standards, so every window we produce, regardless of range, has these bespoke cill pads as standard. That way neither you nor we ever need to worry about water ingress.
By investing a little extra during the manufacturing process, you’ll be protected from the inconvenience and disappointment of damp walls or wet carpets.