A box sash window operates by counterbalancing the weight of the sash against weights attached to a cord and passed over a pulley. These weights travel up and down in a box, concealed within the window frame, hence the name Box Sash Windows. A dividing strip is often suspended within the box to prevent collision of the weights.
Every sash window repair is unique with it’s own problems and solutions. Below are the processes that we usually take to repair, restore and improve your sash window.
- Sliding sashes are carefully removed and the condition of timber, cords, glass and pulleys are all individually examined.
- Any rotten wood, would be removed and new softwood/hardwood would be used to replace like for like, or if beyond repair original profiles can be matched.
- The bottom sash will have weather strips, routed into the top meeting rail and to the bottom of the sash.
- The parting bead and staff bead that will be removed will be replaced with new beading, that is also weather stripped, to ensure that the window is fully draft and weather proof.
- All cords are replaced; pulleys are serviced and sash weights adjusted to ensure perfectly smooth operation of the window.
Traditionally a sash window has a 3mm gap around the sashes to allow the window to move. Inevitably this gap allows in draughts, dust and noise and also allows it to make annoying rattles.
This gap also allows for loss of heat from the home. The installation of the Cheshire Sash Window renovation system into each window seals this gap and actually improves on the original by:
- Cutting out rattles.
- Eliminating draughts.
- Stops heat escaping.
- Reduces external noise.