Roof trusses are large, lightweight timber structures that are vulnerable to wind, instability, and collapse during installation. Lifting and positioning trusses at height requires careful coordination between the crane operator, banksman, and installation team. Unsecured trusses can domino and collapse, causing fatal crush injuries. This talk covers the controls needed for safe roof truss installation.
Key Hazards
Truss collapse or domino effect from inadequate temporary bracing
Workers struck by trusses swinging uncontrolled during the lift
Falls from height during truss positioning and fixing at eaves level
Wind catching lightweight trusses causing loss of crane control
Control Measures
Prepare a lift plan for each truss delivery covering crane position, lifting points, and load weights.
Install temporary bracing to each truss immediately after placement as specified in the design.
Ensure all operatives at height are protected by edge protection or personal fall arrest equipment.
Monitor wind speed and suspend truss lifting when conditions exceed the safe working limit.
Use tag lines to control truss rotation and swing during the lift and positioning.
Brief the crane operator, banksman, and installation team before each lifting session.
Do not release the crane hook until the truss is fully braced and the installer confirms it is stable.
Store trusses flat on bearers on level ground and secure against wind uplift before installation day.
Ensure the gable wall is adequately braced before the first truss is installed.
Remember
Install temporary bracing to every truss immediately after positioning as per the design
Never release the crane hook until the truss is fully braced and confirmed stable
Monitor wind speed and stop lifting trusses when conditions exceed safe limits
Use tag lines at all times to control truss rotation during the lift
All workers at height must be protected by edge protection or fall arrest systems
Applicable Legislation: Work at Height Regulations 2005 · LOLER 1998 · CDM 2015 · BS 5268-3 (Trussed Rafter Roofs)