What Are Sash and Case Windows?
A sash and case window consists of one or more movable frames. The moving window frames are called sashes and are what hold the glass panes in place. The “case” refers to the box in which these sashes move within. Sash and case windows were invented in the late 17th century. Quickly becoming the hallmark of Georgian and Victorian architecture, prized for their elegance and practical design.
In particular Georgian sash windows are known for their classic style and often feature small panes separated by astragals.
Traditionally, these windows are made of timber, though modern versions have now been created out of uPVC or aluminum.
How Do Timber Sash Windows Work?
Sliding timber windows operate using a simple yet innovative design system. The sashes are able to slide vertically within the case, to make this movement smooth and balanced, traditional sash windows use counterweights and pulleys. Pulleys are small wheels located inside the window case. This allowed the sash cords to run over the pulley keeping the ropes within the case cavity. Counterbalances are often referred to as sash weights and help to offset the weight of the heavy timber sashes. The weighting system is concealed within the window case cavity, so if you experience any issues with the weights, a professional will need to assist in resolving the problem.
When you lift the sash, the counterweight moves downward, balancing the weight of the window. This makes it easy to open, hold in place at any height, and close safely. Replacing sash cords is a common maintenance task for heritage sash windows so if you have experiencing issues with opening and closing your windows please get in touch.
The design of sash and case windows allows for excellent ventilation as the upper sash and lower sash can be adjusted independently to control airflow.
How Are Classic Timber Windows Made?
Traditional sash and case windows are crafted from timber, carefully joined with mortise and tenon joints. Glass panes are then fitted into the sash using glazing beads. The sashes are then placed into the case, with sash cords, pulleys, and sash weights installed to ensure smooth vertical movement. The windows are then painted to ensure the timber remains protected from the elements. At Eco Sash & Case we handcraft our timber windows in our Edinburgh workshop. Each window we make is bespoke to match the original design of your previous windows.
Why Are Sash and Case Windows Still in Use Today?
Timber sash windows have been popular for centuries thanks to their classic look, which suits both historic and modern homes. At Eco Sash and Case we can restore, replace and upgrade traditional sash windows to boost your homes energy-efficient. They are also known to add charm and value to properties, particularly in conservation areas and listed buildings.
Maintaining Old Timber Windows
Maintaining sash windows is crucial for home upkeep, particularly in older buildings. Regular care, including painting and draught-proofing, is essential to preserve these windows. Read our maintenance blog.
