Timber windows – joints opening in sashes

Cause

The sash has racked (twisted), or there has been thermal expansion/contraction of the timber

Repair

  • if joint opening is not severe, install corrosion resistant countersunk screws to tighten the joint, fill with exterior grade filler, prime and repaint with at least 2 coats of semi-gloss or high gloss water-based enamel paint
  • if joint opening severe, remove the sash, then dismantle the window by removing the glass and taking sash apart. Prime joints and reconnect; reinstall glass as for 'Cracked or broken glass in timber frames'

Cause

There has been moisture absorption into the timber end grain if the joints were inadequately primed before installation

Repair

  • if joint opening is not severe, install corrosion resistant countersunk screws to tighten the joint, fill with exterior grade filler, prime and repaint with at least 2 coats of semi-gloss or high gloss water-based enamel paint
  • if joint opening severe, remove the sash, then dismantle the window by removing the glass and taking sash apart. Prime joints and reconnect; reinstall glass as for 'Cracked or broken glass in timber frames'