Joints might also fail and should need to be reglued with new dowels and wedges. ‘A straightforward repair service is often made having an angle bracket preset through the joint,’ provides Hunt.  Draught proofing for sash windows includes sealing the gaps through which air escapes although retaining the window’s features. https://eyebrowlaminationkit68923.blogofchange.com/36393309/the-greatest-guide-to-sash-window-draught-proofing