It usually costs less to repair sash windows than to replace them, with good quality replacement units costing between £700 and £1500.

Luckily, some of the most common sash window problems are easily dealt with. Reddiseals, period window specialists tell us how to fix the problems listed below.

Damaged Beading on Glass

To replace rotten or damaged beading on the external/internal glass, carefully lever off the existing beading, making sure you don’t damage the frame, and clean the glass. Make sure the glass is free from all debris, oils etc. Use Reddiseals’ high-performance, double-sided Georgian bar tape to install the new beading.

Rotten or Damaged Staff Bead

Using a claw hammer, prise off the staff bead and any remaining nails from the frame. Position the new staff bead (above) on the frame and attach using nails. Countersink in where possible and fill the hole created before painting.

close up of a sash window

Damaged parting Bead

Firstly, take off all the staff bead on the internal window. Open the pocket and detach the lead from the cord on both sides, making sure that all fasteners are in the open position. Detach the cord from the sash and tie it by the pulley to stop it falling into the frame.

Pull out the existing parting bead and inspect the groove. Measure from the top of the frame to the centre of the meeting rail. Cut two pieces of the parting bead to this length. If the groove is damaged, it can be widened to 10mm using a chisel, with a 10mm plastic channel then fitted into the groove.

If the groove is fine, fit the new parting bead into the groove (or the plastic groove), making sure the weatherpile faces the top sash to seal and the lower half is turned around to seal the bottom sash. Reverse the steps above and re-attach the sash.

Damaged Cord

Open the pocket and move the sash until you can detach the cord from the lead. Remove the lead from the frame and repeat for the second side. Detach the cord from the sash and remove from the frame.

Measure the correct length of cord, and thread the cord over the pulley and down to the bottom of the frame. Pull out of the frame (making sure the other end doesn’t disappear into the frame) and attach to the lead weight. The weight is then inserted back into the pocket. Attach the cord to the sash and repeat for the second side. The staff bead can then be re-fitted to finish the window.

Sash Window

Damaged fasteners

Make sure the fastener is in the open position and unscrew from both meeting rails. Clear any debris from the wood. Position the main fastener on the meeting rail and secure. Place the keep onto the second meeting rail in the correct position and secure. Fill any holes and paint over.

Damaged Pulleys

Open the pocket and move the sash until you can detach the cord from the lead. Remove the lead from the frame and repeat for the second side. Detach the cord from the sash and remove from the frame.

Unscrew the pulley from the frame and install the new pulley. Thread the cord back over the pulley down to the bottom of the frame. Pull out of the frame (making sure the other end doesn’t disappear into the frame) and attach to the lead weight.

The weight is then inserted back into the pocket. Attach the cord to the sash and repeat for the second side. The staff bead is then re-fitted to finish the window.

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