Freestanding guardrails for flat roofs – aluminium railings with counterweights, without penetrating roof waterproofing
M-SAFE® MF freestanding guardrails are a non-penetrating collective protection equipment (CPE) that guarantees complete safety for working at heights without the risk of damaging the roof membrane. System stability is ensured by counterweights, while rubber protective pads beneath the bases prevent damage and abrasion to the roof waterproofing. This system is ideally suited to the specific requirements of technical roofs where regular servicing and maintenance work takes place (e.g., servicing HVAC units or photovoltaic panels). As collective protection equipment (CPE): it protects anyone accessing the roof, regardless of whether they remembered their safety harness or whether they have received fall arrest training at all. Our freestanding aluminium guardrails have successfully passed the tests required by the European standard EN ISO 14122-3:2016 at an independent notified body.
When freestanding guardrails are the right choice — and when they are not
Free standing guardrails are worth considering when you need to protect the edge of a flat roof and penetrating fixings through the roof covering are not wanted. On a roof with a membrane covered by a manufacturer’s warranty where the waterproofing layer must not be compromised, or on a building whose owner refuses any roof penetrations — this is the solution of choice. They are perfectly suited for securing the edges of roofs covered with bituminous felt, PVC membranes, as well as green and gravel roofs. They are also ideal for securing skylights, roof access hatches, and smoke vents.
There are, however, four conditions that must be verified before making a decision:
- Roof pitch up to 15° (27%). Above this value, a freestanding system cannot be used and a fixed permanent guardrail must be selected instead.
- Parapet or roof edge stop with a minimum height of 20 mm. Without this stop, there is a risk of the guardrail slipping, for instance in the event of icing under the counterweights. If such a stop is not present, our technical department will select an alternative fixing method.
- Load-bearing capacity of the waterproofing complex under contact pressure. The M-SAFE® MF freestanding guardrail exerts a contact pressure of 0.04 daN/cm² on the roof covering. This is very low, but it must be checked prior to installation — and it is the parameter most frequently overlooked.
- Roof accessible exclusively for technical maintenance purposes. This solution is intended for roofs accessed solely by qualified maintenance personnel, not for publicly accessible roof terraces.
What freestanding guardrails are not intended for
M-SAFE® MF freestanding guardrails are not crowd control or perimeter barrier fences — they are not designed to cordon off pedestrian walkways, parking areas, or event zones. Nor are they temporary edge protection systems used on construction sites during building works. They are a permanent fixture of building equipment, installed once and remaining on the roof throughout its operational service life.
How the freestanding system works and how many counterweights are required
The entire stability of the system relies on a cantilever brace arm offset from the handrail axis, with counterweights (ballasts) positioned at its end. The further the mass acts from the roof edge, the more effectively it resists the horizontal force applied to the handrail. On M-SAFE® MF freestanding guardrails, the brace arm has an overhang of 1,407 mm, and each single counterweight weighs 12.5 kg.
The counterweight itself consists of concrete encased in a UV-resistant recycled polypropylene shell. This is not an ordinary plastic weight: the casing is engineered to withstand outdoor roof conditions without cracking. The number of counterweights is not a matter of choice. To ensure the installation complies with the EN ISO 14122-3:2016 standard, two counterweights (25 kg) must be installed on each intermediate brace arm and three counterweights (37.5 kg) on each end brace arm — that is, wherever the section terminates with an end cap or at a corner.
The spacing between uprights axes must not exceed 1500 mm. Any installation that does not meet these requirements does not comply with the EN ISO 14122-3:2016 standard.
| Ref. | Upright | Configuration | When to use |
|---|---|---|---|
| MF-S2 | Straight | Handrail + knee rail | Flat roof with a parapet height of at least 100 mm |
| MF-S3 | Straight | Handrail + knee rail + toe board | Parapet lower than 100 mm, or no parapet at all |
| MF-I2 | Inclined 25° | Handrail + knee rail | When the guardrail should not be visible from ground level |
| MF-I3 | Inclined 25° | Handrail + knee rail + toe board | As above, with a parapet lower than 100 mm |
| MF-F2 | Folding | Handrail + knee rail | Modules up to 12 lm, when the guardrail must be concealed from view |
| MF-F3 | Folding | Handrail + knee rail + toe board | As above, with a parapet lower than 100 mm |
A straight or 25° inclined base determines the slope of the upright. In the folding version, a lifeline must be installed before assembly to provide fall protection during installation and subsequent maintenance of the guardrail.
For both structural designers and facility managers, there is also a figure of crucial importance: what static load the aluminium railing system with counterweights exerts on the roof structure. For the straight upright model, the static load transmitted to the load-bearing surface is 19.03 kg per linear meter (13.17 kg/m²). For the inclined upright version, it is 19.08 kg per linear meter (13.20 kg/m²). These values are formally stated in the manufacturer’s static load declaration for configurations compliant with the EN ISO 14122-3:2016 standard.
| Parameter | Value |
|---|---|
| Reference standard | EN ISO 14122-3:2016 |
| Counterweight | 12.5 kg — concrete encased in UV-resistant recycled polypropylene shell |
| Number of counterweights to EN ISO 14122-3 | 2 per intermediate brace arm (25 kg) · 3 per end brace arm (37.5 kg) |
| Maximum upright axis spacing | 1500 mm |
| Brace arm overhang – straight upright | 1407 mm |
| Static load — straight upright | 19,03 kg/mb · 13,17 kg/m² |
| Static load — inclined upright | 19,08 kg/mb · 13,20 kg/m² |
| Contact pressure on roof waterproofing | 0,04 daN/cm² |
| Maximum roof pitch | 15° (27%) |
| Minimum parapet or roof edge stop | 20 mm |
| Handrail height | 1100 mm above the roof walking surface |
| Handrail / knee rail | Aluminium Ø47 mm / Ø35 mm, slide-in sections of 3050 mm |
| Toe board | Aluminium, 180 mm height, sections of 3000 mm |
| Wind resistance — standard configuration | Wind zones 1, 2 and 3 · up to 166 km/h |
| Estimated assembly time | 150 linear metres per day (two people) |
| Finish | Raw aluminium · RAL powder coating on request |
Static load values are taken from the manufacturer’s declaration in accordance with EN ISO 14122-3:2016 for configurations with two counterweights on intermediate uprights. Wind resistance was determined according to NV 65 rules (DTU P 06-002) and Eurocode 1 (EN 1991-1-4).
Wind resistance — up to 166 km/h in the standard configuration
The standard M-SAFE® MF freestanding guardrail — with two counterweights on intermediate brace arms and three on end brace arms — complies with wind load zones 1 (sheltered, normal, and exposed site), wind zone 2 (sheltered and normal site), and wind zone 3 (sheltered and normal site), corresponding to a maximum wind speed of 166 km/h. This is based on NV 65 rules (DTU P 06-002) and Eurocode 1 (EN 1991-1-4 standard).
Any other configuration — particularly exposed roofs, high-rise buildings, or areas subject to higher wind loads — requires additional counterweights, and the solution must be analyzed and approved in advance by the manufacturer’s technical engineering office. This is not a mere formality: it represents the difference between an installation backed by structural engineering calculations and one that is not.
Self-installation option — and why it does not mean losing the manufacturer's warranty
The greatest advantage of M-SAFE® MF freestanding guardrails is their highly intuitive installation. As a result, most of our clients install them themselves. The system consists of a small number of components, requires no drilling or specialist tools, and two people can install approximately 150 linear meters of safety railing within a single working day (8 hours).
What you receive from us prior to assembly
And here lies the heart of the matter. The manufacturer conditions its 10-year warranty on aluminium components on the installation being carried out in accordance with its instructions and properly documented. Our technical support is provided specifically to ensure your own team meets this requirement:
- Layout drawing prepared by our technical office for your specific roof, taking into account the corners, section ends and building location. This serves as official evidence that the installation complies with the EN ISO 14122-3 standard.
- Checklist of inspection requirements — a 6-point checklist that the installer fills out and signs once the work is finished. It verifies component completeness, uprights spacing, correct fastening, and absence of damage.
- Technical briefing and technical support prior to starting assembly and throughout installation. Technical advisory is an integral part of our standard offer, not a separate billable service.
Thanks to this process, assembly carried out by your own team keeps the manufacturer’s full warranty. You save the cost of hiring an external installation contractor without compromising on any formal or warranty requirements. Please note, however, that during installation, workers on the roof must be protected against falls from height. The mere fact that the guardrail is freestanding does not automatically protect the assembly crew while it is being erected.
The step-by-step assembly procedure, along with the required tool list and common pitfalls, is detailed in our dedicated guide: how to install freestanding edge protection railings.
Aluminium instead of galvanised steel — why choose M-SAFE MF aluminium guardrails?
Railings manufactured using hot-dip galvanised steel rely on only a thin zinc coating to protect the steel from corrosion — typically with an average thickness of around 50 µm. During transport and on-site assembly, this coating is frequently scratched or damaged, leading to rust appearing at those points over the years. M-SAFE® MF free standing guardrails are manufactured entirely from raw aluminium; therefore, accidental scratches do not affect their corrosion resistance. M-SAFE® MF aluminium guardrails are fully resistant to corrosion and severe atmospheric conditions — classified in accordance with EN ISO 12944-2 as corrosivity category C3. This corresponds to medium corrosivity category: ‘urban and industrial atmospheres, moderate sulphur dioxide pollution, e.g. coastal areas with low salinity.’ This durability enables us to offer our customers an extended warranty period of up to 10 years on all metallic components. Furthermore, the lightweight nature of aluminium ensures it does not exert unnecessary structural loads on the roof structure.
In highly corrosive environments — such as exposure to aggressive chemicals, heavy industrial pollution, or close to the sea sites — the safety railing should additionally receive a powder-coated finish. Polyester powder coating of aluminium components is available upon request in any RAL colour.
Legal basis: why a roof guardrail comes before a harness
Council Framework Directive 89/391/EEC of 12 June 1989 on the introduction of measures to encourage improvements in the safety and health of workers at work establishes that collective protective equipment (CPE) must take priority over personal protective equipment (PPE). Cable lifeline systems and EN 795 anchor points used with personal fall arrest gear should only be used when collective protection measures, such as freestanding guardrails, cannot be implemented.
All EMEONCE – M-SAFE® MF freestanding technical guardrails we supply meet the most rigorous requirements of the European standard EN ISO 14122-3 (Safety of machinery – Permanent means of access to machinery – Part 3: Stairs, stepladders and guard-rails). They are supplied with official manufacturer declarations of conformity, providing Health & Safety (HSE) coordinators and facility managers with a complete guarantee of compliance and safety om the event of labour inspection audits.
EN ISO 14122-3 also sets out a number of key geometric and dimensional requirements that roof guardrail installations must satisfy. In particular:
- handrail height of 1100 mm above the walking/standing roof surface
- clear space between the handrail and the intermediate knee rail, and between the knee rail and the toe board, not exceeding 500 mm
- toe board with a minimum height of 100 mm installed no more than 12 mm above floor level — mandatory whenever the parapet is lower than 100 mm or absent altogether.
A distinct consideration is the choice between EN ISO 14122-3 and EN 13374. The second standard applies to temporary edge protection systems on construction sites during building works and is considerably less demanding than EN ISO 14122-3. It is sometimes inappropriately applied to freestanding guardrails to increase upright spacing and bring the cost down. We analyze this subject in detail in our dedicated article: which standard to apply to freestanding guardrails.
Frequently Asked Questions (FAQ) About Freestanding Guardrails
Does installing freestanding guardrails require drilling into the roof?
No. The M-SAFE® MF system uses non-penetrating ballast counterweights and requires no holes in the roof covering. Beneath the brace arms are clip-on protection pads made of UV-resistant recycled polypropylene, which protect roof membranes from abrasions and distribute the weight. As a result, no holes are made in the roof waterproofing and there is no risk of water leaks. Before assembly, it is simply necessary to verify that the roof waterproofing system can support the contact pressure, which for the M-SAFE® MF freestanding guardrail is 0.04 daN/cm².
Can a freestanding guardrail withstand strong winds?
The standard configuration — two counterweights on intermediate brace arms and three on end brace arms — complies with wind load zones 1, 2, and 3, corresponding to a maximum wind speed of 166 km/h. This calculation is based on NV 65 rules (DTU P 06-002) and Eurocode 1 (EN 1991-1-4). Highly exposed roofs, tall buildings, and areas subject to higher wind load require additional counterweights, and such a configuration must be analyzed and approved in advance by the manufacturer’s technical design office.
On what types of roof can freestanding guardrails be installed ?
On flat roofs with a pitch of up to 15° (27%), intended for technical maintenance access and not open to the general public. At the roof edge, there must be a parapet or upstand stop of at least 20 mm height to prevent the guardrail from slipping, for instance during icing beneath the counterweights. If the parapet is lower than 100 mm, or absent, EN ISO 14122-3 additionally requires the installation of a toe board. For roof slopes greater than 15°, permanently fixed guardrails must be used instead.
Can I install freestanding guardrails myself without losing the manufacturer's warranty?
Yes, provided the installation is carried out in accordance with the manufacturer’s instructions and properly documented. That is exactly what our technical support is for: before installation we provide a layout drawing prepared for your roof together with the checklist of control requirements, which the installer completes and signs once the work is finished, and we provide technical support while the work is under way. That set of documents is the condition for keeping the manufacturer’s ten-year warranty on the aluminium components. The M-SAFE system was designed with straightforward self-installation by the customer in mind. It is remarkably simple and needs no specialist tools. Two people install around 150 linear metres a day, in eight hours.
How does a freestanding guardrail differ from a temporary edge protection construction barrier?
By its intended purpose and regulatory standard. The M-SAFE® MF freestanding guardrail is a permanent collective fall protection equipment designed in accordance with EN ISO 14122-3 — the standard governing permanent means of access. Temporary edge protection systems on building sites are governed by the EN 13374 standard and apply while construction work is being carried out. EN ISO 14122-3 is far more demanding on key criteria: overall height, system rigidity under load, and maximum upright spacing.
Why should I choose freestanding guardrails instead of traditional anchor points and lifelines?
Roof guardrails provide Collective Protective Equipment (CPE), which unconditionally protect all individuals on the roof simultaneously, without requiring safety harnesses, clip on, or go through repeated and costly rope access training. Under current European labour health and safety legislation, cable lifelines and EN 795 anchor points used with personal fall arrest equipment may only be used when collective protection solutions, such as freestanding guardrails, cannot practically be implemented.
Summary — when to opt for a freestanding solution
A freestanding guardrail represents the fastest, most effective way to permanently secure flat roof edges where roof waterproofing must not be penetrated. As a collective protection measure, it operates passively regardless of whether an operative remembered to clip on — and as a permanent building fixture, it requires no recurring paid annual recertification or specialized work-at-height training, unlike cable lifeline systems and EN 795 anchor devices. Once installed, it protects throughout the whole building’s operational lifespan.
Do you need a customized solution for a specific roof? Send us your roof layout, dimensions, membrane and parapet details, obstacle locations, and expected maintenance usage. We will help you verify whether M-SAFE® MF freestanding guardrails are the optimal solution, define the exact required configuration, and prepare the installation uprights layout plan. Contact our Technical Department today to discuss your project.
If for architectural or aesthetic reasons the guardrail must remain hidden from ground-level view, a folding post model is also available; we detail this option under folding guardrails. For a complete overview of all our guardrail fixing methods, please visit our comprehensive guide to roof guardrails.