HK Truss-out Scaffolder (CIC) cheat sheet

Factories and Industrial Undertakings Ordinance (FIUO) is the parent law; the Construction Sites (Safety) Regulations (CSSR) are subsidiary regulations made under it, alongside the Factories and Industrial Undertakings (Safety Management) Regulation and the FIU (Scaffolding) aspects covered by the general duty provisions.

CSSR reg. 38 series governs scaffolding: scaffolds must be of good construction, sound material, adequate strength and properly maintained; a scaffold must not be used unless erected, altered or dismantled under the supervision of a competent person.

CSSR requires every scaffold to be inspected by a competent person before first use, after any alteration or exposure to weather likely to affect stability, and at intervals not exceeding 14 days; a report (Form-style record) must be made and kept.

FIUO s.6 general duties apply to every employer: provide safe plant and systems of work, safe premises, information/training/supervision; s.6A extends parallel duties to employees to take reasonable care and cooperate with the employer.

Occupational Safety and Health Ordinance and its subsidiary regulations apply to non-industrial workplaces; for facade work on occupied residential buildings the OSH Ordinance duties to persons other than employees are relevant to public protection.

The Code of Practice for Bamboo and Metal Scaffolding Safety (Labour Department) gives practical guidance on design, erection, inspection and dismantling; breach is not itself an offence but is admissible as evidence of contravention of the FIUO/CSSR duties.

The Factories and Industrial Undertakings (Safety Officers and Safety Supervisors) Regulation and the Safety Management Regulation impose safety management systems on larger sites; small truss-out jobs still fall under the general duties.

Scaffolders must hold the relevant trade registration/certification recognised in Hong Kong (e.g. Construction Industry Council trade tests for metal scaffolding / truss-out scaffolding), and only a competent person may supervise erection, alteration and dismantling.

Contractor (principal contractor) duty: plan the work, provide a safe system of work, ensure scaffolds are designed where required, appoint competent persons, and ensure inspections and records are completed before work starts.

Subcontractor duty: only erect within its competence and scope; must not alter another party's scaffold without authorisation and must report defects found during use rather than improvise repairs.

Competent person (scaffold): the person who inspects and certifies the scaffold; competence = training + experience + knowledge of the relevant code; the same person must be able to recognise deflection, corrosion, missing ties and inadequate anchorage.

Scaffolder's own duties: work only to a defined design/instruction, wear and anchor fall protection correctly, check components before use, do not remove ties or guardrails without authorisation, and stop work and report if conditions are unsafe.

Resident/property owner duty: give access, disclose known facade conditions (e.g. weak render, existing cracks, hidden cables) and refrain from interfering with the scaffold while it is in use.

Duty holder for public safety: the contractor must protect the public and residents from falling objects and from the works; this includes covered walkways, netting, exclusion zones and coordination with building management.

Chain-of-responsibility rule: a defect found by any person must be reported to the site supervisor/competent person and recorded; work on that section stops until the competent person re-inspects and clears it.

Interface duty: the contractor must coordinate with other trades and building management so that scaffold ties, anchorages and access are not removed, overloaded or obstructed.

Truss-out scaffold is a cantilevered/raked frame projecting from a building facade; it relies on anchorage to the structure and on triangulated members (raking struts) rather than on ground bearing, so the design must consider overturning and pull-out, not just vertical load.

Load types to consider: dead load (tubes, couplers, boards, mesh, toe boards), live/imposed load (workers, tools, materials), wind load, and dynamic effects from material handling; design against the applicable code and manufacturer/designer values.

Anchorage to the facade must be into sound structural elements (concrete, structural masonry) with approved anchors; fixing into render, cladding, tile or lightweight block is not acceptable unless specifically designed and tested.

Tie-back members and raking struts must form a triangulated, stable system; each truss-out unit should be designed as a stable frame with defined node connections, not a series of independent props.

Stability check: the design must resist overturning about the anchorage line, with a factor of safety against overturning and against anchor pull-out; the uplift/overturning moment from the cantilevered span must be balanced by the anchorage and tie-back arrangement.

Spacing rule: truss-out units are typically spaced at defined centres (e.g. 1.5–2.0 m) per the designer's schedule; the working platform width and the number of boards must match the design, and no unit may be omitted or over-spanned.

Deflection limits: the cantilever tip must not deflect excessively under load; excessive sag indicates under-design or anchor slip and requires unloading and re-inspection.

Any change of span, load, anchorage position or addition of sheeting/mesh increases wind and dead load - such changes require re-design/re-check by the designer, not a field decision.

Steel tube: reject if bent, kinked, dented, cracked, heavily corroded (significant section loss), or if the end is deformed; check straightness by sighting along the tube and check wall thickness where corrosion is suspected.

Couplers: reject if threads are damaged, the bolt is bent, the wedge/plate is deformed, or the coupler does not grip and tighten properly; right-angle, swivel and sleeve couplers must be the correct type for the joint.

Timber boards: reject if split, warped, rotted, knotty to excess, or if the board is not of the specified grade/thickness; boards must be supported at the designed spacing and must not be springy underfoot.

Metal decking/planks: reject if deformed, corroded through, or if the hooks/locating lugs are missing or bent; planks must be secured against uplift and displacement.

Toe boards and guardrails: must be present, sound and correctly fixed; a missing or loose toe board is a rejection item for the platform, not a minor defect.

Protective mesh/netting: inspect for tears, UV degradation, broken fixings and correct overlap; damaged mesh must be replaced before work continues because it is part of the falling-object protection.

Anchors and fixings: reject bent, corroded or reused anchors where single-use is specified; verify the anchor type matches the design and that the hole is drilled to the specified diameter and depth.

Tagging rule: components that fail inspection must be removed from site or clearly marked as rejected and segregated so they cannot re-enter the scaffold.

Sequence: plan and design → survey facade and confirm anchorage positions → install anchors and truss-out frames from a safe platform → add ties/raking struts → lay platform, toe boards and guardrails → install mesh/netting → inspect and tag before use.

Erection must be supervised by a competent person; workers must be trained for truss-out work and must work from a safe platform or with fall protection anchored to an independent lifeline.

Alteration rule: no tie, raking strut or guardrail may be removed without authorisation; if a tie must be temporarily removed for access, the design must specify a temporary replacement and the competent person must approve the sequence.

Dismantling is the reverse of erection, top-down, member by member; never drop or throw components, and never cut or release anchors while the platform above is still loaded.

Exclusion zone: during erection and dismantling, barricade the area below and use a covered walkway or catch fan/net where the public or residents pass.

Weather rule: stop erection/dismantling in high winds, heavy rain or when the platform is wet/slippery; after a typhoon or severe storm the scaffold must be re-inspected before reuse.

Load control during erection: do not stack components on a partially completed truss-out platform beyond its designed capacity; distribute materials and remove waste promptly.

Handover: after erection or alteration, the competent person inspects, records the result and attaches the tag; work must not start until the tag shows a pass.

Hierarchy: eliminate work at height where possible, then use a working platform with guardrails and toe boards; fall arrest is the last line of defence, not the primary control.

Safety belt/harness must be worn and anchored to a suitable anchorage point at all times when working at height without a complete guardrail system; the lanyard must be short enough to prevent a fall to a lower level.

Independent lifeline: a separate, independently anchored lifeline (not the scaffold tube or the truss-out frame) must be used where the scaffold itself is the work location; the lifeline anchorage must be designed for the arrest load.

Anchorage points: must be structural, rated for the arrest force, and positioned so the lanyard does not pass over a sharp edge; never anchor to guardrails, mesh, temporary boards or services.

Lanyard rule: use a shock-absorbing lanyard where the fall distance permits; keep the anchor above the worker where practicable to reduce free-fall distance and pendulum swing.

Inspection of PPE: check harness webbing, stitching, D-rings, buckles, lanyard and shock absorber before each use; reject any item with cuts, fraying, heat damage, corrosion or after it has arrested a fall.

Rescue: a fall-arrest system requires a rescue plan; suspension trauma can be fatal within minutes, so the worker must be recovered promptly and the plan must be briefed before work starts.

Training and fitness: workers using fall arrest must be trained in inspection, anchor selection and rescue, and must be medically fit to work at height.

Falling objects: tools, couplers, boards and waste can strike residents, pedestrians or workers below; control by toe boards, mesh, tool lanyards, exclusion zones and covered walkways.

Public protection: maintain a covered walkway with a designed roof where the public passes, and keep it clear; do not allow residents to lean out of windows or hang items on the scaffold.

Overhead cables: identify and isolate or divert power lines before erecting near them; maintain the statutory safe clearance and treat all cables as live until confirmed dead by the utility.

Interface with residents: agree access times, protect windows and property, avoid blocking escape routes, and coordinate so residents do not open windows into the scaffold or use it for access.

Interface with other trades: other trades may overload the platform, remove ties or interfere with guardrails; the contractor must coordinate and re-inspect after any interference.

Structural/facade hazards: weak render, loose tiles, spalling concrete, asbestos-containing material, and hidden services in the facade can fail when anchors are drilled; survey and make safe before drilling.

Environmental hazards: wind gusts at height, rain, heat and poor lighting increase risk; work must stop when conditions make the platform unsafe.

Occupied-building fire and emergency: keep escape routes clear and ensure the scaffold does not obstruct firefighting access or building exits.

Pre-use check: before each shift, the user checks guardrails, toe boards, boards, ties, mesh, tags and access; any defect means stop work and report.

Statutory inspection: competent person inspects before first use, after alteration or weather likely to affect stability, and at intervals not exceeding 14 days; a written report is made and retained.

Tag system: a scaffold tag shows the scaffold ID, date of inspection, result (pass/do not use), inspector and next inspection date; a red/do-not-use tag means no access.

Records: keep inspection reports, design drawings, anchor test records and training records; they are evidence of the system of work and are required for statutory compliance.

Maintenance: replace damaged components, re-tighten couplers, re-fix loose toe boards and mesh, and re-check anchors for slip or corrosion; maintenance work is itself recorded.

Reporting defects: any person who finds a defect must report it immediately to the supervisor/competent person; the section is isolated and tagged until repaired and re-inspected.

Post-event inspection: after a typhoon, heavy rain, impact, or any suspected overload, the scaffold must be inspected by a competent person before reuse, regardless of the 14-day cycle.

Tag integrity: tags must be weatherproof, legible and attached at the access point; a missing or illegible tag is treated as a do-not-use condition.

Emergency plan: before work starts, brief workers on rescue of a suspended fall-arrest casualty, first aid, evacuation routes and the emergency contact numbers for the building and the site.

Fall rescue: a worker suspended in a harness must be recovered as soon as possible; call emergency services, do not delay for paperwork, and treat for suspension trauma on recovery.

Incident reporting: report fatalities, serious injuries, dangerous occurrences and specified accidents to the Labour Department and/or other authorities as required; keep the scene and records.

Internal reporting: all incidents, near misses and defects are recorded in the site accident/incident book and reviewed so preventive action is taken.

Accident prevention: toolbox talks, pre-task risk assessment, permit-to-work for facade work, supervision, and stop-work authority for unsafe conditions.

Emergency access: keep the covered walkway, exits and firefighting access clear, and ensure the scaffold does not block rescue routes.

Communication: maintain contact with building management and residents during emergencies, and provide clear signage and barriers.

Review: after an incident, review the design, anchorage, inspection records and work method, and implement corrective actions before work resumes.