One of the most significant developments in house-roof construction in recent years has been the introduction of the trussed rafter. This is a light-weight timber truss which can be used to replace the rafters, struts, purlins and ceiling joists of the traditional roof. It is fabricated prior to erection and so avoids difficult in situ nailing. Some common trussed rafter configurations are illustrated and, of these, the 'W' truss is most frequently used.

Originally published December 1966; reprinted January 1967 and November 1968. Superseded by BS CP112 Part 3.