Falls During Wall Frame Erection and Walking on Frames
HighErecting wall frames requires workers to lift, position, and temporarily brace frames that are 2.4-3.0 metres high before permanent fixing and stability is achieved. Workers often stand on bottom plates or erected frames to position top plates and install bracing, creating significant fall hazards. Walking along top plates of wall frames to access work areas or position adjacent frames is particularly hazardous as the narrow surface provides unstable footing, especially before ceiling joists or roof trusses connect frames together. Falls from erected frames typically result in serious injuries including spinal damage, head injuries, and fractures. Risk factors include windy conditions affecting balance, wet surfaces on timber, rushed work, inadequate temporary bracing causing frame movement, and fatigue affecting coordination.
Structural Collapse from Inadequate Temporary Bracing
HighWall frames and roof structures lack inherent stability until permanent bracing, ceiling joists, and cladding are installed. Temporary bracing is essential to prevent collapse from wind loads, impact, or unintended forces during construction. Inadequate temporary bracing has caused catastrophic collapses killing and injuring multiple workers. Timber wall frames require diagonal bracing both in-plane and perpendicular to prevent racking and overturning. Steel frames require temporary props and wind posts. Roof trusses need progressive bracing installed according to manufacturer specifications as erection proceeds. Common failures include insufficient bracing, inadequate fixing of bracing, premature removal of props, and not following engineering details. Wind gusts can topple unbraced frames without warning.
Manual Handling of Heavy Framing Members
HighFraming involves frequent manual handling of heavy materials including wall frames weighing several hundred kilograms, individual timber bearers and joists up to 40kg, long steel members, and roof trusses. Wall frames are particularly hazardous during tilting up operations requiring coordinated team lifting while controlling the frame. Bearers spanning 6-7 metres in hardwood are extremely heavy and awkward. Steel framing members have sharp edges increasing injury risk. Manual handling occurs in difficult positions including overhead work, on uneven surfaces, and in confined spaces. Repetitive lifting throughout the day causes cumulative fatigue. Inadequate coordination during team lifting causes sudden loading when one person loses grip. Long members striking other workers or structures during positioning causes secondary injuries.
Falls from Height During Roof Truss Installation
HighRoof truss installation involves working at substantial heights, typically 3-6 metres for residential construction and higher for commercial buildings. Workers position and secure trusses from elevated work platforms, mobile scaffolds, or temporary working platforms installed on wall frames. The work requires reaching beyond platform edges to position bracing and fix trusses. Working on installed trusses to fit progressive bracing involves walking on narrow members without fall protection. Temporary instability of trusses before bracing is complete creates movement hazards. Weather exposure including wind makes maintaining balance difficult. Falls from roof level cause the highest proportion of construction fatalities.
Crane and Lifting Equipment Incidents
HighLifting roof trusses, steel beams, and heavy wall frames using cranes involves multiple hazards including load drops, struck-by incidents from swinging loads, equipment failure, and electrocution from contact with overhead power lines. Improper rigging causes loads to shift or fall during lifting. Exceeding crane capacity can cause structural failure. Communication failures between crane operator, dogger, and workers positioning loads creates dangerous situations. Working beneath suspended loads is prohibited but occurs when workers rush to position materials. Contact with overhead power lines causes electrocution of crane operators and ground crew. Wind affects suspended loads making control difficult.
Power Tool Operation Hazards
MediumFraming requires extensive power tool use including circular saws, nail guns, impact drivers, and angle grinders for steel cutting. Circular saws present kickback and laceration risks, particularly when cutting structural timber with knots and irregularities. Pneumatic nail guns can misfire, double-fire, or discharge nails through materials striking workers on opposite sides. Operating nail guns on wall frames at height increases risk of falls if kickback affects balance. Angle grinders cutting steel generate hot sparks presenting fire and eye injury risks. Damaged power cords create electrocution hazards. Repetitive nail gun use causes hand-arm vibration syndrome. Working in awkward positions affects tool control.
Unprotected Floor and Roof Openings
HighDuring floor framing before decking is installed, large unprotected openings exist between joists creating fall-through hazards. Stairwell openings in multi-storey construction remain unprotected during framing stages. Roof penetrations for services and access create openings that may not be immediately apparent. Workers can step into openings when carrying materials obstructing view, in poor lighting conditions, or when distracted. Fall-through incidents occur even with experienced workers who believe they know opening locations. Openings become particularly hazardous in cluttered conditions where temporary covering may be displaced or removed.
Exposure to Treated Timber Chemicals
MediumStructural framing commonly uses CCA, ACQ, or copper azole treated pine for bottom plates, bearers in subfloor areas, and any timber in ground contact or termite risk areas. Cutting, drilling, and handling treated timber creates exposure through skin contact and inhalation of sawdust containing hazardous preservatives. Chronic exposure to copper-chrome-arsenate compounds presents long-term health risks. Workers often handle treated timber without gloves, particularly during manual handling operations. Sawdust accumulates on skin and clothing. Inadequate hand washing before eating allows ingestion. Burning treated timber off-cuts, sometimes done to manage waste, releases extremely toxic fumes containing arsenic compounds.