Fire compartmentalisation is mandatory in a production facility when the building’s floor area, occupancy type, or fire risk classification exceeds the thresholds set by national building regulations — typically derived from the European Construction Products Regulation and local fire safety codes. In most EU member states, any production or industrial building above a defined floor area must be divided into separate fire compartments, each bounded by fire-rated construction elements including walls, floors, and doors. The sections below unpack the specific rules, classifications, and documentation requirements that determine exactly what is required for your project.
What building regulations determine compartmentalisation requirements?
Fire compartmentalisation requirements in production facilities are governed by national building codes that implement European fire safety directives at the member state level. In the Netherlands, the primary reference is the Besluit Bouwwerken Leefomgeving (BBL); in Germany it is the respective Landesbauordnung; in the UK it is Approved Document B. All of these codes translate the underlying principle of EN 13501-2 fire resistance classification into enforceable rules for specific building types and uses.
For industrial and production buildings specifically, regulations typically define maximum compartment sizes based on the building’s intended use, the fire load present, and whether automatic sprinkler systems are installed. A production hall classified as a high fire-load environment will face stricter compartmentalisation requirements than a low-risk storage space. The relevant authority is always the local building permit office or fire safety inspector, but the technical standards that define what a compliant fire door or fire wall must achieve are set at the European level through EN 1634-1 and the harmonised CE marking framework.
Architects and project managers specifying doors for compartment boundaries should verify which national annex applies to the project location, since the same European standard can result in different minimum resistance periods depending on where the building is located. In the Netherlands, the BBL sets only the absolute minimum requirement — the actual classification required for a specific project depends on the compartmentalisation calculation, the building type, any applicable sector-specific regulation such as PGS15 for chemical storage, and any requirements imposed by the client or insurer. A qualified fire safety engineer should be consulted to determine the correct classification for your situation.
Which fire resistance class is required for a production facility?
The required fire resistance class for a production facility depends on the compartment size, the building height, and the occupancy classification defined in the applicable building code. Fire resistance classifications are defined under EN 13501-2 and describe how long a closed door withstands fire — expressed as a combination of performance criteria and a duration in minutes. The three core criteria are:
- E (Integrity) — no flames or hot gases pass through the door
- W (Radiation reduction) — limits radiant heat transfer through the door. This is the Dutch standard baseline criterion.
- I1 / I2 (Insulation) — limits the temperature rise on the unexposed side. I1 is the stricter criterion; I2 permits a higher temperature rise on the unexposed side.
In practice, the Dutch baseline for industrial compartment boundaries is EW60 — meaning the door blocks flames and limits radiant heat transfer for 60 minutes. EI2-60 is a common and fully valid alternative. Heavier classifications such as EI1-60, EI2-90, or EI1-120 may be required depending on the project’s fire safety calculation, the building type, sector-specific regulation (for example PGS15 for chemical storage), or requirements set by the client or insurer.
Because production facilities vary enormously in fire load, floor area, and construction type, the correct resistance class must always be confirmed against the specific building permit conditions and the fire safety plan prepared by a certified fire safety advisor. Always distinguish between EI1 and EI2 when reviewing or specifying door classifications — these are not interchangeable. Selecting a lower or incorrect class is one of the most common and costly compliance errors in industrial construction.
Does compartment size affect which doors are required?
Yes, compartment size directly affects which fire resistance class is required for the doors that form the compartment boundary. Larger compartments concentrate more fire load and create greater risk of fire spread, so building codes assign higher resistance requirements as compartment floor area increases. The exact classification required for a given compartment size depends on the project-specific fire safety calculation — this cannot be determined from compartment size alone, and a qualified fire safety engineer should be consulted.
Beyond the resistance class, compartment size also affects the physical size of the door opening itself. Large industrial compartments often require wide or tall openings to accommodate production flows, forklift traffic, or oversized equipment. Standard commercial fire doors are rarely engineered for these dimensions. This is where industrial-grade fire doors — tested and certified for large clear openings — become necessary rather than optional.
Metacon-Next’s fire-rated industrial doors are manufactured specifically for large and demanding openings, with certified products available across multiple fire resistance classifications and door types including roller curtains, roller doors, overhead doors, sliding doors, and pedestrian doors. Every product is tested in accordance with EN 1634-1, so the certification directly reflects real-world performance at the dimensions specified.
What’s the difference between EI and EW fire resistance classifications?
EI and EW are two distinct fire resistance classifications defined under EN 13501-2, and they must never be used interchangeably in a specification. Both describe how a closed door performs during a standardised fire test — but they measure different things.
EW (Integrity and Radiation reduction) means the door maintains integrity — no flames or hot gases pass through — and limits radiant heat transfer through the door for the stated period. EW60, for example, provides this performance for 60 minutes. EW is the Dutch standard baseline classification for industrial fire doors.
EI (Integrity and Insulation) adds an insulation requirement on top of integrity. It is essential to distinguish between the two insulation sub-classes:
- EI1 — the stricter insulation criterion, limiting the temperature rise on the unexposed side to a lower threshold
- EI2 — the less strict insulation criterion, permitting a higher temperature rise on the unexposed side
Never write “EI” alone without specifying whether it is EI1 or EI2 — these are different performance levels and must be named explicitly in any specification or product description.
Whether EW or EI1/EI2 is required for a specific compartment boundary in a production facility depends on the project’s fire safety calculation, not on a general rule. Consult a qualified fire safety engineer or contact Metacon-Next directly to determine which classification applies to your situation.
When reviewing product documentation, always confirm that the classification report explicitly states the full classification code — for example, EW60, EI2-90, or EI1-120. A document that uses “EI” without the suffix, or that conflates EW and EI without clear distinction, should be treated as incomplete until clarified by the manufacturer.
When does an insurer require stricter compartmentalisation than the building code?
Insurers frequently impose compartmentalisation requirements that exceed the minimum set by building regulations, particularly for production facilities with high asset values, business interruption risk, or hazardous materials. While the building code defines the legal minimum needed to obtain a permit, the insurer defines the conditions under which a claim will be honoured — and these two sets of requirements do not always align.
Industrial property insurers commonly require smaller maximum compartment sizes than the code permits, higher fire resistance periods for compartment boundaries, or the installation of automatic suppression systems as a condition of coverage. In some cases, an insurer will specify EI1-90 or EI2-90 for all compartment doors in a facility where the building code’s minimum would be satisfied by EW60, because the insured asset value or production continuity risk justifies the additional protection.
Project managers and facilities managers should request the insurer’s fire protection requirements in writing before finalising the specification, not after. Discovering that the installed doors do not meet the insurer’s conditions after construction is complete creates a costly remediation problem and can leave the facility owner exposed during the period before rectification. If you are working through a certified installer or dealer, they should be able to advise on the gap between code minimums and typical insurer requirements for your building type.
What documentation proves a fire door meets compartmentalisation requirements?
A fire door meets compartmentalisation requirements when it is accompanied by a complete set of documentation that includes a valid classification report, a CE Declaration of Performance, and installation instructions that match the tested configuration. The classification report, issued by an accredited test laboratory under EN 1634-1 and classified per EN 13501-2, is the primary document — it defines the exact conditions under which the door achieved its stated classification, including the opening dimensions, frame type, and hardware tested.
The following documents should be present for every fire door installed on a compartment boundary:
- Classification report referencing EN 13501-2, stating the full resistance classification (for example EW60, EI2-60, EI1-90) and the tested configuration
- CE Declaration of Performance (DoP) confirming the product meets the requirements of the Construction Products Regulation. For industrial fire doors, CE marking is governed simultaneously by EN 16034 (fire/smoke resisting closing element) and EN 13241 (industrial door, general) — both standards apply and should be reflected in the documentation
- Installation manual specifying the exact conditions required to maintain the tested performance — frame dimensions, wall construction, hardware, and sealing
- EPD (Environmental Product Declaration) where required for BREEAM or LEED project certification
- Maintenance and inspection protocol confirming the door remains compliant over its service life
One of the most common documentation failures in industrial construction is installing a door that is certified, but installing it in a configuration that differs from the tested assembly — a different frame, a different wall substrate, or additional hardware not covered by the classification. The door’s certification is then void, even though the product itself carries a valid CE mark.
Metacon-Next publishes all certificates, classification reports, and EPDs publicly on its website — a transparency standard that is not required but that allows architects and project managers to verify compliance independently before specifying or approving a product. For projects where documentation completeness is critical, you can request a full documentation package alongside any quotation.
For production facilities where fire compartmentalisation requirements are complex, large-format openings are involved, or both code and insurer requirements must be satisfied simultaneously, working with a manufacturer that controls its own testing, certification, and documentation is the most reliable way to eliminate compliance risk. Metacon-Next designs and manufactures fire-rated industrial doors entirely in-house, with certified products available across a range of classifications — including EW60, EW90, EW120, EI2-60, EI1-60, EI2-90, EI1-120, and beyond — for roller curtains, roller doors, overhead doors, sliding doors, and pedestrian doors. All products are supplied exclusively through a network of certified dealers and installers, ensuring that the installation is warranted alongside the product itself. For guidance on which classification is appropriate for your specific project, consult a qualified fire safety engineer or contact Metacon-Next directly.
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