TRADA Quality Assurance Scheme Quality control method in truss manufacture administered by the BM TRADA Certification.
A piece of timber used to frame around openings.
A lightweight framework, generally but not always triangulated, placed at intervals of 600mm to support the roof. It is typically made from timber members of the same thickness, fastened together in one plane using nailplates or plywood gussets.
Trussed Rafter Designer
The person responsible for the design of the trussed rafter as a component and for specifying the points where bracing is required.
A metal component designed to provide a safe structural connection of trusses to wallplates. Also to resist wind uplift and to prevent the damage caused by skew nailing.
A metal component designed to provide a structural connection and support for a truss to a girder or beam.
Uniformly Distributed Load
A load that is uniformly spread over the full length of the member.
A member raking from incoming ridge to corner in a valley construction.
Infill frames used to continue the roofline when roofs intersect.
The line where the trussed rafters meet the gable wall.
A timber member laid along the length of the load bearing walls to provide a level bearing and fixing for the trusses.
Timber members that connect the rafters and the ceiling tie together forming triangular patterns which transmit the forces between them.
An arrangement of additional timbers or other structural elements in the roof space, specially designed to transmit wind forces to suitable loadbearing walls.