General advice on the cause of resin exudation in joinery timber and the procedures which can reduce its effect in service.

General advice on the procedures that are carried out during the manufacture of timber windows and the effect of poor protection or changes in climatic conditions can have on the windows in service.

This guide is intended to explain briefly the relationship between the British Standard for timber windows, BS 644, and the European Product Standard for windows, BS EN 14351-1.