This part of BS 5268 provides guidance on the design, fabrication and use of trussed rafters for roofs in service classes 1 and 2 as defined in 3.1 and 3.2.
Guidance is provided on structural analysis methods, engineering design criteria and design by testing.
Performance requirements for roof bracing are given, together with standard bracing arrangements for domestic scale roofs. Production requirements are also given for truss manufacture, along with guidance on their handling, storage and erection. Maximum spans for two common truss configurations for a range of member sizes and roof pitches are given, based on extensive tests.