Cert III Scaffolding key terms

A temporary structure erected to support workers, materials or equipment at height during construction, maintenance or demolition work, and dismantled once the task is complete.

A documented layout prepared before erection that shows scaffold type, dimensions, foundation, ties, access, load limits and the sequence of erection, alteration and dismantling.

The maximum uniformly distributed and concentrated load a scaffold is designed to carry safely, expressed in kilopascals or kilograms per bay and stated on the scaffold tag.

A category that states the intended working load and use of a scaffold, such as light, medium, heavy or special duty, which determines the number of planks and the standards spacing.

The permanent weight of the scaffold itself, including standards, ledgers, transoms, planks, toe boards and any fixed attachments, which the structure must support at all times.

The variable weight placed on a scaffold during use, including workers, tools, materials and stacked supplies, which changes as the work proceeds and must stay within the rated limit.

A vertical tube that transfers the scaffold's weight down to the base plates and foundation, forming the main upright member of the structure and spaced according to the design.

A horizontal tube running parallel to the face of the building that connects standards together, supports the transoms and stiffens the scaffold against sideways movement.

A horizontal tube placed at right angles to the building face, sitting on the ledgers, that supports the decking and ties the inner and outer rows of standards together.

A flat steel plate fixed under the foot of each standard to spread the scaffold load over a larger area of the foundation and reduce the risk of sinking.

A timber or steel bearer laid on the ground beneath base plates to distribute the scaffold load over a wider surface, particularly on soft or uneven ground.

The ground, slab or structure that carries the scaffold's weight; it must be firm, level, drained and capable of supporting the fully loaded scaffold without settlement.

The platform of planks or steel boards laid across transoms to give workers a safe standing surface, usually fitted with toe boards and secured against movement.

A low vertical board fixed along the edge of a working platform to stop tools, materials and debris from being kicked or blown off the scaffold onto people below.

A horizontal rail fitted at the open edges of a platform, at least at the top and mid heights, to prevent workers from falling and to contain materials.

A fixing that anchors the scaffold to a building or structure to resist wind and lateral forces, typically a through tie or a reveal tie installed at the designed spacing.

The resistance of a scaffold to sideways forces such as wind, impact and uneven loading, achieved through ties, bracing, plan bracing and a sound foundation.

Diagonal tubes fixed across standards and ledgers, either in the face plane or in plan, to stop the scaffold racking sideways and to transfer horizontal loads to the ground or building.

The sideways distortion of a rectangular frame into a parallelogram under horizontal load, which bracing is designed to prevent in a scaffold structure.

The space between two adjacent standards along the length of a scaffold, measured between their centres and used as the unit for load rating and plank requirements.

The vertical distance between one level of ledgers and the next, or the height of one complete working platform above the previous one on a scaffold.

The fully decked level of a scaffold from which work is actually carried out, complete with guard rails and toe boards and rated for its intended duty.

A written record signed when a completed scaffold is handed to the user, confirming it was erected to plan, is complete and safe, and stating its load rating and any restrictions.

A notice attached at the access point showing whether a scaffold is safe to use, its duty rating, the date of inspection and the name of the competent person who checked it.

A check of a scaffold carried out by a competent person before first use, after alteration, after an incident and at the required intervals, with results recorded.

A worker who holds the relevant qualification, training and experience to perform a task safely, such as erecting, inspecting or altering a scaffold of a given type.

A national licence required to perform certain high-risk tasks, including basic, intermediate and advanced scaffolding, issued after training and assessment by a registered assessor.

A document that sets out the high-risk construction tasks to be done, the hazards involved, the control measures to be applied and who is responsible for each step.

A structured process of identifying hazards, judging the likelihood and consequence of harm and deciding on controls before work starts.

The ranked order of risk controls from most to least effective: eliminate the hazard, substitute, isolate, engineer, then use administrative controls and finally personal protective equipment.

Clothing and gear worn by a worker to reduce exposure to hazards, such as a hard hat, safety boots, gloves, glasses and a harness, used after higher controls.

A system, such as a harness connected to a lanyard and anchor, that stops a worker's fall after it begins and limits the distance and force of the drop.

A structural fixing of certified strength to which a lanyard, lifeline or tie is attached, capable of withstanding the load of a falling person or the wind load on a scaffold.

A barricaded area beneath or around scaffolding work that keeps unauthorised people out of the drop zone where tools or materials could fall.

A scaffold built on castors so it can be moved between positions, used only on firm level ground, with wheels locked and never occupied while it is being moved.

A swivelling wheel fitted to the base of a mobile scaffold, equipped with a locking brake that must be applied whenever the tower is in use.

A stabilising arm fitted to a mobile or tower scaffold to widen its base and increase resistance to overturning, often used with a ballast or counterweight.

A scaffold supported from the structure above or from beams projecting outwards, rather than from the ground, requiring careful design of the supporting members and tie-back.

A working platform hung from overhead supports by ropes, chains or cables, allowing work on high faces where ground-supported scaffolding is impractical.

A suspended platform with a deck and guard rails that is raised and lowered by powered hoists on wire ropes, commonly used for facade work on tall buildings.

An internal scaffold with standards in rows both ways and decking at one or more levels, used for ceiling work in large rooms, requiring careful bracing and access design.

A scaffold assembled from separate steel or aluminium tubes joined by right-angle, swivel or sleeve couplers, giving flexibility in shape but requiring skilled assembly.

A system scaffold made of prefabricated frames, ledgers or rosette fittings that lock together in fixed increments, giving fast, consistent erection with fewer loose parts.

A clamp used to join two scaffold tubes at a right angle, at a swivel angle or end to end, tightened to a specified torque so the joint does not slip.