Box sash windows are extremely popular in old and new houses in the UK and the United States. Originally sash windows were fitted to Victorian and Georgian properties. Box sash windows were traditionally made from hardwood or softwood but are now widely available in UPVC. Traditional sliding sash windows were single glazed units but nowadays are available in single glazing and as double glazed box sash windows. The term sash window refers to a type of window that has sliding panels usually with a weight and pulley system for opening the sliding window panes.
Box sash wooden windows are made with a hollow section within the window frame that holds the sash weights. The sash weights are attached to a sash cord that is in turn connected to the sliding window pane. Commonly the sash weights in the weight and pulley system are made from lead, although more recently some sash weights are made from steel. The sash cord is manufactured from braided cotton that has been pre-stretched and has a polished finish to prevent wear. Some of the newer sash cords are made from other materials and man made fibres such as polypropylene and nylon for increased abrasion resistance.
Box...