Scaffolding Safety

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Overview

A scaffold must be erected only by a competent scaffolder.

It must be founded, tied, fully boarded, inspected and tagged before use.

Erection requirements

Firm foundation — sole boards and base plates on level ground.
Standards plumb, level, and tied to the structure.
Full boarding with no gaps or trap boards.
Edge protection — top rail ~0.95–1.1 m, mid-rail and toe boards.
Safe access — secured ladders, never climbing the frame.

Step-by-step procedure

Confirm the design, load class and tie pattern.
Set up an exclusion zone during erection or dismantling.
Lay sole boards and base plates on firm ground.
Erect standards, ledgers and transoms; brace as you go.
Tie the scaffold to the structure and add bracing.
Fully board and fit top rail, mid-rail and toe boards.
A competent person inspects and tags before first use.
Re-inspect after alteration, bad weather and every 7 days.

The scafftag inspection system

Green tag — inspected and safe to use.
Red tag or no tag — do not use.
Inspected before use, after alteration/weather and every 7 days.
Never exceed the stated load class.

Roles & responsibilities

Role	Responsibility
Scaffold Supervisor / Competent Person	Plans design, leads erection, controls alterations.
Inspector	Inspects and tags before use and at each interval.
Users	Check tag is green, stay within load, report defects.

Common mistakes to avoid

Using a red-tagged, untagged or altered scaffold.
Removing guardrails, toe boards or ties.
Overloading the platform beyond its load class.

Legal requirements (Thailand)

Occupational Safety, Health and Environment Act B.E. 2554 (2011) — the governing workplace-safety law in Thailand.
Ministerial Regulation on OSH management for construction work B.E. 2564 (2021).

Frequently asked questions

What is Scaffolding Safety?

Scaffolds give workers a safe, stable platform to work from at height, but a poorly built or poorly maintained scaffold is one of the most dangerous structures on a site. A collapse, a fall from an unguarded edge, or an object dropped from a platform can injure or kill several people at once. For this reason scaffolds must be designed, erected, altered and dismantled only by a competent scaffolder.

Who is responsible?

Scaffold Supervisor / Competent Person: Plans the design, leads erection and dismantling, and controls alterations.; Inspector: Inspects and tags the scaffold before use and at every required interval.; Users: Check the tag is green, work within the load limit and report any defect.

What are the most common mistakes to avoid?

Using a scaffold with a red tag or no tag, or after an untracked alteration. Removing guardrails, toe boards or ties and not putting them back. Overloading the platform with materials beyond its load class.

References — Scaffold good practice (TG20 / EN 12811); Thai construction safety regulation and OSH Act B.E. 2554.