Collective protection or PPE against falls from a height: When which measure applies and what the STOP principle means
Collective protection takes precedence – that is the clear message of the STOP principle in German occupational safety. But in practice, the question always arises: When do I have to erect a guardrail, and when is PPE against falls sufficient? The answer is not always clear – but the decision-making logic is.
What is collective protection?
Collective protection refers to measures that protect all persons in a hazardous area simultaneously – without each individual having to act actively. On roofs, these are primarily side protection systems, guardrails, and roof edge protection. All persons entering the secured area are protected – regardless of whether they wear a harness or not.
What is PPE against falls?
Personal protective equipment against falls (PPE against falls) protects the individual person wearing it. A fall arrest harness, connecting device, and anchor point form a system that either prevents access to the fall edge (restraint system) or arrests a fall (fall arrest system). PPE against falls must be individually fitted, adjusted, and checked by each person.
The STOP Principle: The Hierarchy is Binding
The STOP principle (Substitution, Technical, Organisational, Personal) defines the order in which protective measures are to be selected. Technical measures – i.e., collective side protection – take precedence over organisational measures and personal protective equipment.
This means in concrete terms: PPE against falls is not a convenient alternative to a guardrail. It is only the right choice when collective protection is not technically possible or disproportionately unreasonable. This must be justified and documented.
When is collective protection not possible?
There are situations in which a guardrail cannot be technically erected: for very short jobs directly at the roof edge (e.g., gutter cleaning at one spot), for roof shapes where no guardrail can be attached, for areas where a guardrail would make work impossible, and for emergency access or areas with very infrequent individual access.
In these cases, PPE against falls is the approved alternative – but it must be correctly selected, worn, and supported by a rescue concept.
When is PPE against falls better than a guardrail?
There are situations in which PPE against falls is not only permissible but actually the better solution: for very rare, short access by instructed skilled personnel, for roof transitions or areas that cannot be fully secured by guardrails, and as a supplement to collective protection in special areas.
What DGUV 201-056 says about it
The revised DGUV Information 201-056 (September 2025) reaffirms the STOP principle and makes it concrete for roofs: Collective protection is the preferred measure. If PPE against falls is used, a complete protection concept must be in place – including a suitable anchor point, the correct connecting device, instruction, and a rescue plan.
Collective protection at Gerüstexpress
For the majority of roof work, collective side protection is the right first choice. In the Gerüstexpress range, you will find:
- Roof edge protection for flat and pitched roofs – compliant with DIN EN 13374
- Mobile anchor points – for use as an anchor point with PPE against falls
Not sure what the right solution is for your application? Get advice now – we will help you choose the right system.
Frequently Asked Questions
Can I always use PPE against falls instead of a guardrail?
No. According to the STOP principle, collective protection has priority. PPE against falls is only permissible when collective protection is not possible or unreasonable – and this must be justified.
Do I have to document why I use PPE against falls instead of a guardrail?
Yes. The risk assessment must include the justification for why collective protection was not applied.
Is PPE against falls more expensive than a guardrail?Often cheaper to purchase. But PPE against falls requires instruction, regular inspection, suitable anchor points, and a rescue concept – the total costs are often higher than expected.
