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Flooding can lead to the breakdown of the edge seal in double-glazing. Check for mud and water stored in hollow window and door frames and drain any contamination found by drilling a drain hole at top and bottom of the frame. If you can see condensation between the panes, replace the double glazed unit. Single glazing is largely unaffected unless completely broken, however, check the condition of putty, window locks etc to ensure the windows are secure.
Sash windows may distort following a flood. Care should be taken not to force sash windows and cause further damage. As they dry out swelling of the wood will reduce and they may return to full function. If the window needs to be open to aid drying remove beading and take out the opening sash, do not plane down the sash down until the wood is totally dry and the fit has been tested. Temporary beading can be screwed into position to provide security when the building is unoccupied.
Clean all windows. Clean window locks and hinges and oil to prevent corrosion.
20 November 2002