Falls from Unprotected Scaffold Edges
HighThe most critical hazard when working on scaffolds involves falls from platform edges where guardrails are missing, inadequate, or have been removed and not replaced. Edge protection comprising top rails at 900-1100mm height, mid-rails, and toe boards is mandatory on all scaffold platforms, but may be absent on incomplete scaffolds, removed to facilitate materials hoisting, damaged by weather or impacts, or simply never installed on non-compliant structures. Workers focused on their primary tasks may step backwards near edges, lose balance when reaching or lifting, or trip over materials falling toward unprotected edges. The false sense of security from working on seemingly stable platforms can reduce vigilance compared to obviously precarious situations. Falls from scaffold heights of 3-8 metres typically result in severe injuries including spinal fractures, traumatic brain injuries, multiple broken bones, and frequently death when workers strike ground, protruding materials, or structures during the fall. Risk intensifies in poor lighting, cluttered platforms, adverse weather with slippery surfaces, and when workers carry materials limiting visibility and balance.
Consequence: Fatal or catastrophic injuries from falls resulting in permanent disability, spinal cord damage, traumatic brain injuries, and multiple fractures requiring extended hospitalization and rehabilitation.
Scaffold Platform Collapse from Overloading
HighScaffolds have specified safe working load (SWL) limits typically ranging from light duty (225kg per bay) to heavy duty (675kg per bay), but workers may unknowingly exceed these limits by concentrating bricks, blocks, bagged cement, pavers, or equipment beyond platform capacity. A standard pallet of bricks weighs approximately 1000kg, immediately exceeding most scaffold platform ratings if concentrated in one bay. The cumulative weight of multiple workers, their tools, and materials can exceed capacity even when individual items seem reasonable. Overloading causes platform planks to bow or break, scaffold tubes to bend, couplers to slip, and foundations to settle or punch through ground. Progressive collapse can occur where failure of one overloaded section transfers loads to adjacent bays that then fail in cascade. The risk intensifies on suspended scaffolds where connections to overhead supports are stressed beyond design limits, and on scaffolds erected over soft ground where base plate loading exceeds soil bearing capacity. Workers may not recognize they are overloading platforms as deflection and stress are not visible until failure is imminent.
Consequence: Catastrophic scaffold collapse causing multiple workers to fall simultaneously from height, with falling materials and scaffold components creating additional crushing and striking hazards.
Falls Through Gaps in Platform Planking
HighScaffold platforms require continuous planking with gaps not exceeding 25mm to prevent workers or materials falling through. However, incomplete scaffolds may have missing planks, planking may be removed for materials hoisting or movement between levels, planks may shift creating dangerous gaps, or scaffolds may be erected with inadequate planking from the outset. Workers stepping onto scaffold platforms in poor lighting or when carrying materials may not see gaps until stepping into them. The gap between the scaffold platform and building face is particularly hazardous as workers may fall through this space when working close to structures. Planks can shift when walked on if not secured, creating gaps that appear suddenly. On multi-level scaffolds, falls through platform gaps at upper levels result in workers falling through multiple scaffold levels before striking ground or intermediate platforms. The combination of working at height with attention focused on work tasks rather than platform integrity creates scenarios where gaps go unnoticed until someone falls through.
Consequence: Falls resulting in severe injuries or death, with particularly devastating outcomes when workers fall through multiple scaffold levels striking intermediate platforms and structures during descent.
Structural Instability and Collapse from Damaged Components
HighScaffold structural integrity depends on all components being undamaged and properly connected. Bent or dented scaffold tubes have reduced strength and may fail under normal loads, damaged couplers may slip allowing connections to separate, cracked base plates can punch through supports, missing bracing allows scaffolds to rack and collapse sideways, inadequate ties to buildings permit scaffold movement, and corrosion weakens steel components. Impact damage from mobile plant, materials handling, or severe weather may compromise scaffold structures without obvious visible indicators. Vibration from nearby construction activities, traffic, or equipment can loosen connections over time. Settlement of scaffold foundations in soft ground or on inadequate base supports causes differential movement stressing connections. Workers typically cannot assess structural adequacy of scaffold components without specialist knowledge, making reliance on inspection tags and reporting of any observed damage critical. The insidious nature of structural deterioration means scaffolds that were safe when erected may become dangerous over time if not regularly inspected and maintained.
Consequence: Sudden structural collapse causing workers and materials to fall from height, often without warning, with multiple casualties and falling scaffold components creating secondary striking hazards.
Struck by Falling Materials and Tools from Upper Levels
HighWorkers on scaffold platforms face serious risks from materials, tools, and debris falling from upper scaffold levels or being dropped by workers above. Common scenarios include tools slipping from workers' hands, materials stacked near platform edges being knocked off, wind blowing loose materials from upper levels, and deliberate lowering or throwing of materials without adequate controls. A falling hammer from 6 metres achieves velocity sufficient to cause fatal head injuries, brick or block materials create massive impact forces, and sharp tools cause penetrating trauma. Toe boards on scaffold platforms provide some protection but cannot contain all falling objects. Workers may not hear warnings shouted from above in noisy construction environments, and hard hats while mandatory provide limited protection against heavy falling objects. The risk intensifies on multi-trade scaffolds where numerous workers on different levels may not have clear sightlines or communication. Scaffold users below materials hoisting operations face extreme risk as loads weighing hundreds of kilograms pass overhead.
Consequence: Severe head injuries, traumatic brain injuries, spinal damage from struck-by incidents, with potential fatalities from heavy falling objects striking workers from height.
Unsafe Access and Egress Falls
MediumAccessing and exiting scaffold platforms safely requires using designated access points including scaffold stairs, properly secured ladders, or safe step-through points in guardrails. Workers frequently take shortcuts by climbing scaffold tube members, stepping between platforms and windows or structural openings, or using scaffolding cross-bracing as ladders despite these practices being prohibited. Climbing external scaffold tubes while carrying tools or materials creates extreme fall risk as three-point contact cannot be maintained. Access ladders may be improperly secured, positioned at incorrect angles, or have damaged rungs. In wet or icy conditions, scaffold stairs and ladders become slippery increasing fall risk. Workers in a hurry or under time pressure are most likely to use unsafe access methods. Fatigue at end of shift reduces coordination and increases stumble and fall risk during egress. The transition points between scaffold platforms and permanent building structures are particularly hazardous as workers step across gaps or over guardrails.
Consequence: Falls during access or egress causing fractures, head injuries, and sprains, with risk of falling from full scaffold height if climbing exterior scaffold tubes or cross-bracing when falls occur.