Basic Scaffolding (SB) cheat sheet

Standard (upright/leg): vertical load-bearing member that transmits the scaffold load to the base plate or sill.

Ledger (runner): horizontal member running parallel to the wall that ties standards together and supports bearers or transoms.

Transom (bearer): horizontal member spanning between standards perpendicular to the wall; supports putlogs or decking.

Putlog: short member with a flattened end that seats in a masonry putlog hole; putlog scaffolds are non-independent and rely on the wall.

Brace types: ledger (longitudinal) bracing in the outer face, facade (transverse) bracing at ends and intervals, and plan (horizontal) bracing.

Base plate and adjustable base jack distribute load; sole board (sill) spreads load over soft or low-strength ground.

Guardrail system: toprail 0.9-1.15 m above platform, midrail about halfway, and toeboard at least 100 mm high.

Scaffold types by support: independent (own standards both faces), putlog (leans on wall), mobile (castors), and suspended (hung from overhead structure).

Ties connect scaffold to structure; they resist wind and lateral load and are classified as through ties or reveal/box ties.

Common collapse causes: missing or removed ties, missing braces, overloading, unstable ground, and unauthorized alteration.

Overhead power line rule: maintain the utility's minimum approach distance; if not achievable, isolate/de-energize or use a permit and barriers.

Platform openings (gaps in decking) and incomplete platforms are fall hazards; unprotected edges require guardrail or personal fall arrest.

Falling object control: toeboards, debris nets, catch fans, exclusion zone below, and tool tethering or closed containers for loose material.

Weather thresholds: stop erection/climbing in high wind (commonly 17 m/s or per manufacturer), ice, lightning, or poor visibility.

Ground hazards: excavations adjacent to the base, buried services, slope, backfilled trenches, and vehicle impact near the scaffold line.

Manual handling and struck-by risks: hoisting loads over the scaffold, swinging materials, and uncontrolled crane lifts near the structure.

Site controls: barricade the base, post warning signage, restrict access to trained persons, and use a permit-to-work where required.

Load classes (light/medium/heavy duty) set the uniformly distributed load (UDL) the platform is designed for; never exceed the class rating.

Load types to combine: dead (self-weight of scaffold and decking), live (persons, tools, material), wind, and environmental (snow, ice).

Design should consider the worst credible combination, e.g. dead + live + wind, and concentrated point loads from stacked material.

Point-load check: a single heavy item or wheel of a barrow can exceed the UDL allowance; spread loads over bearers.

Wind force increases with the square of wind speed; sheeting, netting, and signage greatly increase the sail area and overturning moment.

Overturning and sliding are resisted by ties, bracing, and anchorage; verify stability for the unloaded and partially erected condition.

Factor of safety and permissible stress design are set by the governing standard; manufacturer's load tables govern system scaffolds.

Never mix components from different systems unless compatibility and capacity are confirmed by the manufacturer or engineer.

Count material and persons on every lift; accumulated storage on multiple levels is a frequent cause of overload.

Base must bear on a firm, level, drained surface; base plates bear on sole boards sized to spread load below the soil bearing capacity.

Soil bearing capacity varies widely (e.g. firm clay vs loose fill); soft spots, made ground, and backfill require an engineer's assessment.

Never support standards on incomplete slabs, suspended floors, or manhole covers without checking capacity and propping.

Adjustable base jacks level the scaffold; extension beyond the manufacturer's limit reduces capacity and stability.

Groundwater, frost heave, and rain softening can undermine the base; provide drainage and re-inspect after weather.

Stability comes from ties, bracing in three planes, and, for freestanding towers, an adequate base-to-height ratio per manufacturer.

Mobile towers: lock castors, use outriggers/stabilizers where specified, and never move a tower with persons or material on it.

Check for underground services and excavations before setting bases; keep spoil and plant away from the base line.

Sequence: set out and level bases, erect standards and first lift ledgers, install bracing, then ties, then decking and guardrails.

Ties and braces go in as the lift rises; do not leave a lift unbraced or untied overnight or during high wind.

Erection and dismantling are done in reverse order; dismantle from the top down, removing ties only as the work descends.

Only trained, competent persons erect, alter, or dismantle; a competent supervisor and a method statement (with a drawing for complex scaffolds) are required.

Hoisting: raise components in a controlled manner, use a gin wheel or crane with rated rigging, and keep the area below clear.

Modification control: any change to ties, bracing, decking, or loading requires reassessment and re-tagging before use.

Fall protection during erection: use a personal fall arrest system with a suitable anchor, or advance guardrails from a protected position.

Dismantle sequence: remove toeboards and guardrails, then decking, then ledgers/transoms, then standards, lowering components, never dropping them.

After dismantling, inspect and sort components; damaged items are tagged out and removed from service.

Safe access to every platform via a ladder, stair tower, or ramp; climbing the scaffold frame is not acceptable access.

Ladder rules: extend about 1 m above the landing, secure top and bottom, set at roughly 1:4 (75 degrees), and keep rungs clear.

Guardrail system: toprail 0.9-1.15 m, midrail, and toeboard; gaps in guardrails must not permit a fall.

Fall arrest: full-body harness with energy absorber and self-retracting or fixed lanyard, anchored above and clear of swing-fall hazards.

Fall arrest requires a rescue plan and prompt retrieval; suspension trauma risk means rescue within minutes.

Platforms should be fully decked, secured against uplift, and free of gaps wider than the standard allows.

Access openings in decks need a hinged or removable cover with guardrails on all sides when open.

Lanyards must not be attached to guardrails, ledgers, or unverified points; anchorages need a rated capacity.

Inspect before first use, after alteration, after any event (impact, storm, overload), and at intervals set by the standard or site rules.

Inspection scope: base and ground, standards, ledgers, bracing, ties, couplers, decking, guardrails, access, and tags.

Tag system: green 'safe for use' with date and inspector, red 'do not use', and a tag must be current and legible.

Defect examples: bent or corroded tubes, cracked welds, missing couplers, loose base jacks, split decking, missing toeboards.

Couplers must be tightened to the specified torque (commonly around 40-65 Nm per manufacturer) and checked with a torque wrench.

Maintenance: clean, dry, and store components; replace damaged parts; do not use damaged or non-compatible parts.

Records: keep inspection logs, tag register, and defect reports; the scaffold register tracks who erected and when.

Remove or lock off a scaffold that fails inspection; only a competent person clears it for reuse.

Duty holders: employer, principal contractor, scaffold erector, and user each have defined duties for safe erection and use.

Core duties: provide a safe place of work, competent persons, information/training, and a risk assessment and method statement.

Competence: training, experience, and knowledge; erectors hold a recognized scaffold qualification and supervisors are assessed.

The scaffold user must check the tag and report defects; the erector must not leave a scaffold in an unsafe condition.

Design and loading: complex or non-standard scaffolds need design by a competent engineer and a drawing.

Regulatory themes: fall protection, scaffold inspection intervals, load rating signage, and prohibition of unauthorized alteration.

Record keeping: training certificates, inspection records, design drawings, and method statements must be available on site.

Coordination: scaffold changes must be communicated to all affected trades and re-tagged before use resumes.