Wind and aerial work platforms: What you absolutely need to know for safe use

What You Need to Know

Wind loads are one of the most underestimated dangers when using work platforms, because the wind has a much stronger effect at height than at ground level.Even at a height of 20 meters, the wind speed can50 percent higherbe, and additional effects such asNozzle effect at building edgesThey can even double it. The DIN EN 280 standard only allows uses up toWind force 6 (12.5 m/s)for outdoor stages, while indoor stages are not designed for wind at all.Large-area materialMisjudged wind, lack of wind measurement, and individual factors such as overhang, inclination, or gusts can very quickly lead to this.The tipping moment is greater than the stabilizing moment.Many accidents happen because operators rely on their instincts and don't know how strong wind forces actually are at that height.

The most important measures for safe operation are: always measure wind at working height, observe the nameplate, realistically calculate the wind load of the material, do not use indoor platforms outdoors, wear PPE when using telescopic platforms and lower the platform at the first sign of gusts.They are particularly criticalGusts,Material with a large surface area,InclinationsandOverloadingBecause these factors multiply the risks. The accident statistics clearly show:Rollovers are among the deadliest types of accidents.Even if it's not the most common occurrence, understanding and taking wind loads into account dramatically reduces the risk and makes working significantly safer.

Key problem: Why wind loads are so often underestimated

Wind load is one of the most underestimated risks when using aerial work platforms. At ground level, wind force 6, with 12.5 m/s or around 45 km/h, often seems relatively harmless. You can move freely, and only larger branches begin to visibly move. It is precisely this subjective perception that leads to wind at working height being misjudged.

At working heights of 15, 30, or more than 60 meters, however, the conditions change fundamentally. With increasing height, wind speed increases significantly, and the boom of a stage presents a large surface area to the wind . This considerably amplifies the forces, and seemingly moderate wind speeds can critically affect stability.

At a height of approximately 20 meters, wind speed is typically about 50 percent higher than at ground level. A speed of 12.5 m/s quickly becomes 18.75 m/s. Additionally, a so-called nozzle effect occurs at building corners, between buildings, or in front of open facades. The wind concentrates in these areas and can locally reach twice its strength compared to open terrain.

Normative requirements and rules

DIN EN 280 as a basis

DIN EN 280 "Mobile elevating work platforms" defines the essential stability requirements and specifies the permissible wind loads. All modern work platforms are designed and tested according to these specifications. They thus form the decisive set of rules for safe outdoor use.

The standard is based on the following calculation values:

• Maximum permissible dynamic pressure: 100 N/m²
• This corresponds to a wind speed of 12.5 m/s (force 6).
• This corresponds to approximately 45 km/h and clearly recognizable movements of thick branches.

Important for your work: Many older stages were designed for significantly lower wind speeds. Some models only allow 8–10 m/s. Therefore, you must check the nameplate and operating instructions before every use.

Beaufort scale and practical guidelines

In practice, the limit is almost always wind force 6. Above this load, the use of stages without special certification is not permitted.

Physical principles of wind loads

Dynamic pressure formula

The dynamic pressure q describes the force that the wind exerts directly on a surface. The formula is:

q = 0,5 × ρ × v²

with:

• ρ = air density (approx. 1.25 kg/m³)
• v = wind speed in m/s
• q = dynamic pressure in N/m²

At wind force 6, a dynamic pressure of approximately 100 N/m² results. This value forms the basis for the design of all modern outdoor work platforms.

Wind power on open land

You can calculate the actual wind power W on an area A using:

W = q × A × c p

The shape coefficient c_{_p} takes the geometry of the surface into account. Smooth sheets or panels often have a high coefficient, which can mean that the actual wind force is significantly higher than the base value. This effect is frequently underestimated in practice.

Wind load specifications for people, materials and components

Wind load on people

According to DIN EN 280, a person's wind exposure area is assumed to be 0.7 m². At wind force 6, this results in a force of approximately 70 N acting on the body. In reality, larger people or clothing with a larger surface area can significantly exceed this value.

Wind load on material and tool

The standard allows for a wind load of only 3 percent of the maximum payload for transported materials. This value is extremely low, and large-area elements in particular quickly exceed this limit.

A typical example from practice:

Case 1: Profiled sheet metal panel 0.95 × 2 m

• Wind area: 1.9 m²
• Theoretical wind load according to standard: 0.018 kN
• Actual wind load at wind force 6: 0.19 kN

This means the actual value is approximately ten times the norm. Safe transport is only possible in very light winds.

Case 2: Same sheet metal at wind force 3

• Dynamic pressure: 12.5 N/m²
• Wind load: approximately 0.024 kN

Here too, the permissible value is exceeded. The wind load on large-area materials is therefore a crucial risk factor.

Stability calculation: Stabilizing moment versus overturning moment

A stage is only stable if the stabilizing moment is greater than the tipping moment:

M S > M K

The tipping moment arises from wind force, personnel load, material load, and unfavorable leverage ratios. With boom lifts, the load on a single support can increase to up to 80–90 percent of the total weight. Without adequate support, there is a significant risk of sinking and tipping.

Common mistakes and critical situations

Error 1: No wind measurement on site

Many rely on weather reports or their own assessment. This is dangerous, because weather stations measure at a height of ten meters, not at the working height of the stage. The only reliable method is an anemometer directly in the performance area.

Mistake 2: Using indoor stages outdoors

Indoor stages are not designed for wind. Even slight air currents can destabilize the machine. This repeatedly leads to serious accidents.

Error 3: Transporting large-area materials

Tarpaulins, sheet metal, or facade elements generate wind forces that quickly exceed permissible values. The result is an increased tipping moment.

Mistake 4: Underestimating the nozzle effect on buildings

Wind currents are intensified in narrow passages and corners. The actual forces there can be up to twice as high as in open terrain.

Error 5: Inclination limits ignored

Even slight inclines further increase the tipping moment. Combined with wind, the risk increases considerably.

Error 6: Overloading and incorrect weight distribution

Too many people or incorrectly placed material can shift the center of gravity unfavorably. This increases the risk of critical vibrations and tipping moments.

Error 7: Missing PPE

Gusts of wind or vibrations can cause the user to be thrown from the basket. Telescopic platforms must always be used with personal protective equipment against falls from height (PPEgA) to prevent this catapult effect.

Accident statistics: The most common causes

IPAF Global Safety Report 2016-2018

Of the 68 fatal accidents analyzed, most involved:

• Falls from height
• electric shocks
• entrapments
• Stage overturning

Working in an elevated position is particularly dangerous. Two-thirds of accidents occur when the boom is fully extended.

Why wind loads are so treacherous

Invisibility and misjudgment

Wind is difficult to predict, especially at high altitudes. You often only feel the physical strain once the stage has already reacted.

Dynamic forces caused by gusts

The standard uses average values, while in reality gusts occur that are 20–50 percent above the average. These peak loads can further strain stability and the structure.

Combination effects

Wind rarely acts alone. Inclination, projection, material load, and stage movements reinforce each other and increase the tipping moment.

Practical measures and protective precautions

Planning before deployment

Carefully examine the location. Narrow passages, building corners, or elevations significantly influence wind conditions. Choose a stage that is appropriate for the surroundings and the expected loads.

Large-surface materials should only be transported in low wind conditions. If in doubt, it's best to leave them on the ground.

Monitoring during the operation

Measure the wind regularly with an anemometer. Gusts can occur suddenly and require the platform to be lowered immediately. Avoid jerky movements and keep the platform as stable as possible.

Emergency measures

If the wind exceeds the permissible level, you must immediately stop the operation. Lower the platform and wait for more stable conditions. Avoid sudden steering movements in case of disturbances or vibrations.

Reasons for frequent misjudgments

Routine and habituation

Many operators have experienced numerous deployments without incident and therefore underestimate the danger. However, it is precisely this routine that leads to warning signals being ignored.

Pressure from deadlines

Clients often push for quick completion. This leads to risks being taken that could easily be avoided if sufficient time were allowed.

Inadequate training

Many people don't understand the underlying physics and therefore rely too much on gut feeling. But wind loads follow clear rules that one must know.

The type plate is missing or illegible.

A lack of information regarding permissible wind speed leads to incorrect decisions. You should always ensure that the machine and documentation are complete and legible.

Practical calculation examples

Example 1: Truck-mounted work platform with supports

A 10-ton vehicle, at maximum extension, exerts up to 90 percent of its load on a single outrigger. Without sufficiently large support plates, this outrigger will sink in, and the platform can tip over. However, suitable plates can reliably reduce the ground pressure.

Example 2: Wind load at a height of 25 meters

A measured wind speed of 12.5 m/s at ground level often corresponds to approximately 18 m/s at a height of 25 meters. This doubles the dynamic pressure to about 200 N/m². A person then experiences a force of approximately 140 N, which significantly impairs stability.

Conclusion: Why wind loads must be taken seriously

Wind loads are particularly dangerous because they are invisible, difficult to assess, and dynamic. The forces increase considerably at height, and combined effects with overhang, material load, or inclination further increase the risk.

The most important preventive measures are:

• Always measure wind at working height
• Refer to the type plate and operating instructions.
• Calculate realistic wind load
• Avoid transporting materials with a large surface area if possible.
• Use PPE against falls from height (PPEgA) consistently when using telescopic platforms

Accident statistics clearly show that while tipping over isn't the most frequent type of accident, it's one of the most dangerous. The better you understand and consider wind loads, the safer you can work with aerial work platforms.

About the author

Martin Biberger

Managing Director

Martin is the founder and managing director of BIBERGER Arbeitsbühnen & Forklifts.

He is responsible for thetechnical areaTogether with his team, he is responsible for thetechnical purchasingthe machines thatFurther development of the machine inventoryand the smooth operation of over 1,500 BIBERGER rental devices.

From many years of experience he knows theStrengths and weaknesses of all device classes, the possibleAreas of applicationand thetechnical possibilities– always with a view to theDevelopment of the entire industryand future innovations.