In the construction industry, scaffolding is an essential piece of equipment. Yet, every year, serious accidents—sometimes fatal—occur due to an overload on poorly controlled scaffolding. Exceeding the load-bearing capacity of a structure can cause its collapse in seconds, endangering all workers on site.
This article explains what scaffolding overload really is, what legal obligations apply, how to calculate permissible loads, and above all, how to avoid hazardous situations.
1. What is scaffold overload?
Scaffold overload occurs when the total load applied to the structure exceeds its rated bearing capacity. This total charge consists of several components:
• The weight of workers present on the floor
• The weight of stored materials (bricks, cement bags, tiles, etc.)
• The weight of tools and work equipment
• Dynamic loads due to movements and vibrations
• Environmental loads such as wind, snow, or rain
A scaffold is not a repository of materials. It is sized to allow the execution of precise work, not to store large loads over long periods.
Load classes according to the NF EN 12811-1 standard
The European standard NF EN 12811-1 defines six load classes (from 1 to 6) according to the permissible uniformly distributed loads:
• Class 1: 0.75 kN/m2 — inspection work
• Class 2: 1.50 kN/m2 — light work (painting, cleaning)
• Class 3: 2.00 kN/m2 — standard work
• Class 4: 3.00 kN/m2 — masonry work
• Class 5: 4.50 kN/m2 — heavy-duty work
• Class 6: 6.00 kN/m2 — very heavy work
It is imperative that the scaffolding used on site corresponds to the appropriate load class for the planned work.
2. What are the risks associated with overloading?
Overloading scaffolding can have catastrophic consequences for both people and property:
Structural Risks
Worker Risks
Legal and financial risks
In the event of an accident related to overloading, the responsibilities are multiple and heavy: site manager, SPS coordinator, user company, or even the manufacturer if the equipment is defective. Criminal charges for endangering life and significant civil penalties may follow.
3. French scaffolding loading regulation
French legislation is strict regarding the use of scaffolding. Here are the main texts to know:
Work Code
Article R. 4323-69 of the Labor Code requires that all scaffolding must be calculated and designed so as to withstand safely the loads and stresses to which it may be subjected.
Decree of January 8, 1965
This historical decree relating to specific protection and health measures applicable to establishments whose staff carry out work at height remains a reference for the strength obligations of temporary structures.
Standard NF EN 12811-1
This European harmonized standard sets performance and design requirements for work scaffolding. It is directly applicable in France and defines load classes, safety coefficients and structural verification methods.
Mount, Use, and Unmount Plan (Pmud)
For any scaffolding over 24 meters in height, a PAUD (Assembly, Use and Disassembly Plan) is mandatory. This document must specify the maximum permissible loads per level.
4. How can I prevent overloads on scaffolding?
Preventing overload on scaffolding requires several concrete actions to be implemented right from the site preparation phase.
Choose the right scaffolding type
Select scaffolding based on the nature of the work. A façade scaffolding for painting work does not have the same characteristics as a masonry scaffolding. Always consult the manufacturer’s manual and check the certified load class.
Clearly display maximum loads
The maximum permissible load per level must be displayed visibly on the scaffolding. This display must be set up as soon as it is installed and maintained throughout the work.
Train and raise awareness among teams
Site workers must be trained on the risks of overloading. They must know the maximum permissible loads, know how to respect them, and have the reflex to alert their team leader in case of doubt.
Organize material storage
Never use scaffolding as a permanent storage area. Materials must be supplied in calculated quantities, corresponding only to the immediate needs of the workers.
Check the structure regularly
Daily visual checks and periodic formal checks must be performed by a competent person. Any discrepancies (deformation, loose assembly, damaged tray) must be reported and corrected immediately.
5. The most common errors on construction sites
Despite current regulations, certain bad practices persist on worksites and constitute major risk factors:
• Storage of entire pallets of materials on a single scaffolding level
• Simultaneous presence of too many workers on the same platform
• Use of a scaffolding that is lower than the actual needs of the worksite
• Failure to read the manufacturer’s instructions before assembly
• Not taking into account dynamic loads (wind, shocks, machine vibrations)
• Unauthorized modification of the scaffolding structure
These errors are often the result of a lack of training, poor site organization or excessive time pressure. Recall that no delay justifies endangering the lives of workers.
Overload on scaffolding is one of the main causes of serious accidents in the construction industry. It can occur quickly, often due to ignorance or negligence. The key lies in team training, scrupulous compliance with current standards—notably NF EN 12811-1—and the implementation of rigorous procedures from the site preparation phase onwards.
By respecting the load classes, clearly displaying the limits on the equipment and carrying out regular checks, you drastically reduce the risk of accidents and effectively protect your teams.
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