The natural gaps around sash windows create cold draughts and allow significant heat to be lost which can often lead to chilly and uncomfortable rooms and increased heating bills during the winter months. Traditional window seals usually have to be glued to the side of windows or frames and get stripped off when the sash window is opened or closed. They are generally not effective for windows that no longer open or on uneven surfaces. Gapseal is a proven sash window gap filler, designed to reduce the cold draughts and improve the comfort and energy efficiency of your home.