4.1 Working at Height: Legal Basis, Fall Physics and the Fall-Control Hierarchy

The legal position in 2026

There is no regulation in force that is dedicated to work at height. DOSH's work-at-height page states that existing legislation in Malaysia does not give a specific definition of working at height. Draft Work at Height Regulations have been circulated, but none had been gazetted when this guide was checked (October 2026). The former BOWEC Regulations 1986, often quoted for guardrail heights and catch platforms, were repealed on 1 June 2024.

The duties therefore come from:

The 2-metre benchmark

DOSH's 2007 falls guideline applies to work 2 metres or more above a lower level. It says that "fall protection shall be supplied and used in any place where an employee is at risk of a fall of 2 metres or more". Each employee on a surface with an unprotected side or edge 2 metres or more above a lower level is to be protected by a guardrail system, safety net system or personal fall-arrest system. The guideline also says fall protection is still needed below 2 metres where a fall could cause serious harm, for example onto projecting rebar, into water or into machinery.

Why short falls kill

Ignoring air resistance, a falling body's speed after a drop h is

$$v = \sqrt{2gh}$$

and the time taken is

$$t = \sqrt{\frac{2h}{g}}$$

with g = 9.81 m/s².

The force on the body depends on how quickly that energy is absorbed. Hitting concrete stops a body in a few millimetres, producing forces far beyond what the skull, spine or internal organs can survive. That is why DOSH's guideline limits the arresting force on a worker in a fall-arrest system to less than 6 kN (Section 4.3), and why head injuries from falls of only one or two metres are common in accident reports.

The fall-control hierarchy

DOSH's work-at-height guidance gives the order:

1. Avoid work at height where it is practical to do so.
2. Prevent falls using an existing safe place of work, or the right equipment.
3. Minimise the distance and consequences of a fall where the risk cannot be eliminated.

Within each step, collective measures come before personal ones (First Schedule, principle 8).

Collective measures protect everyone in the area without any action by the worker. Personal systems protect only the wearer, depend on correct fitting, inspection, anchorage and clearance, and create a rescue problem after a fall.

Planning work at height

DOSH's work-at-height guidance says employers should:

• consider weather conditions that could affect safety
• check the place where work at height will be done, such as a roof, every time before use
• prevent objects from falling, or, if that is not practical, mark off no-go zones or use nets to trap falling objects
• store materials safely so they cannot collapse or be knocked over
• plan for emergencies and rescue, and "don't rely solely on the Fire Department for your rescue plan"
• use equipment that is suitable, strong, maintained and inspected regularly, installed to the approved design and manufacturer's instructions, and inspected by a person with sufficient SKE before use where its safety depends on how it is installed, with records kept
• appoint workers with sufficient skills, knowledge and experience, or supervise trainees

Task HIRARC checklist for work at height

1. Height and clearance: distance to the lower level and any obstructions; is there enough clearance for a fall-arrest system?
2. Edges and openings: every open edge, floor opening, lift shaft and stairwell
3. Surface: fragile roofing sheets or skylights; wet, sloping or unfixed decking
4. Access and egress: stairs or ladders; how tools and materials reach the work
5. Duration and posture: a short task from a ladder versus prolonged work needing a platform
6. Falling objects: who is below; is there an exclusion zone or a fan?
7. Rescue: how a suspended or injured worker will be brought down, and how fast

Medical fitness

DOSH's falls guideline (paragraph 2.2) says employers shall arrange pre-placement examinations to check that workers are physically and psychologically fit to work at height. They cover vital signs (height, weight, blood pressure and pulse), vision screening (acuity, peripheral and colour vision), occupational and medical history, physical examination and audiograms. A doctor decides fitness on the results. An SSS should not exclude workers on assumptions, but should make sure assessments are done and that workers who feel unwell on the day are not sent up.

Weather and stop-work decisions

Malaysian sites face intense heat, sudden heavy rain, squalls and frequent thunderstorms. There are no DOSH-prescribed wind or rain limits for general work at height, so set the rules in the construction phase plan and method statements from these sources:

• Manufacturers' limits. Mobile elevating work platforms, gondolas, mast climbers and cranes carry a maximum wind speed in their manuals or on their plates. Work must stop before that limit is reached. Fit or use an anemometer where wind-sensitive plant is used.
• Temporary works design. Netting or sheeting a scaffold increases wind load; the design must allow for it (CDM regulation 21).
• Wet surfaces. Heavy rain makes steel beams, metal decking and formwork slippery. Stop leading-edge, roofing and steel erection work in heavy rain and inspect afterwards.
• Lightning. Elevated steel, cranes and scaffolds attract strikes. A common rule is the US weather service's "30-30" guidance: take shelter if the gap between a flash and its thunder is under 30 seconds, and wait 30 minutes after the last thunder before going back up.
• Heat. Long exposure on roofs and decks drives heat stress, a cause of dizziness and falls (Section 10.1).

Scenario: perimeter beam formwork on Level 22

Carpenters are told to fix external beam formwork at an open slab edge with harnesses looped around column starter bars. The SSS stops the work because:

1. The hierarchy was skipped. Edge protection was not installed, although the edge is accessible and proprietary barriers are available.
2. Starter bars are not a designed anchorage and can cut a lanyard. DOSH's guideline also says never to use guardrails as anchors.
3. Thunder is audible and gusts are rising, and the method statement sets no weather limits.

The SSS's corrective plan:

• install edge protection (or a perimeter screen) before formwork work resumes
• provide engineered anchor points for the few tasks where edge protection must be removed
• set a no-go zone and fans below
• add weather stop rules and a height-rescue plan to the method statement
• re-brief the crew at a toolbox meeting