In the Netherlands, a stairwell door in a new-build or renovated structure typically requires a fire resistance classification of at least EI1 30 or EI1 60, depending on the building type, number of storeys, and the specific fire safety calculations that apply to the project. The exact classification is never fixed by the Dutch BBL (Besluit Bouwwerken Leefomgeving, formerly Bouwbesluit) alone — it follows from a combination of minimum regulatory requirements and project-specific factors. This article works through the key questions architects and specifiers face when determining the correct fire door classification for a stairwell opening.
Which fire resistance classification applies to stairwell doors?
Stairwell doors in the Netherlands are classified according to the European system for fire-resistant closing elements under EN 13501-2: EI1 or EI2, combined with a duration in minutes (30, 60, 90 or higher). The classification indicates how long the door maintains its integrity (E) and insulation (I) under standardised fire test conditions per EN 1634-1. For most stairwell applications, EI1 60 is the most commonly encountered minimum, though the actual requirement depends on the project-specific fire safety calculation.
The fire resistance classification for a stairwell door does not have a single universal answer. Stairwells function as protected escape routes, which means the separating construction — including the door — must limit the spread of fire and smoke long enough for occupants to evacuate safely. Whether EI1 30, EI1 60 or a higher class applies depends on the building’s function, height, use category, and any project-specific fire safety measures specified in the fire safety report. Which classification is sufficient for a given situation is a question for a qualified fire safety engineer or the local authority — not something that can be answered by a general rule.
For architects specifying fire doors in industrial or large-scale commercial projects, the classification must be confirmed before the product is selected. Metacon-Next’s fire-rated door range covers EI1 30, EI1 60 and EI1 120, including for non-standard opening dimensions that frequently occur in industrial stairwell configurations.
What does the Dutch BBL say about stairwell fire doors?
The BBL (Besluit Bouwwerken Leefomgeving) sets the absolute minimum requirements for fire compartmentation and escape route protection, including the performance of separating constructions such as stairwell doors. It does not prescribe a single fixed fire resistance class for every stairwell — instead, it defines a minimum threshold that depends on the building’s use function, height category, and fire compartment configuration. It is important to understand that the BBL sets only this floor, not the ceiling: the actual requirement for a specific project may be higher, and the BBL minimum alone does not determine what a door must achieve.
Under the BBL, stairwells in residential and utility buildings above a certain height must be enclosed by constructions with a defined fire resistance duration. The stairwell door, as part of that enclosure, must meet the same performance level as the surrounding wall. For many utility buildings and industrial complexes, the BBL baseline is EI1 30 or EI1 60. Heavier requirements can and do arise from:
- Project-specific fire safety calculations (brandveiligheidsrapport) where the building deviates from standard regulations
- Sector-specific regulations such as PGS15 for hazardous substances storage, which can mandate a heavier classification than the BBL baseline
- Client or insurer requirements that exceed the statutory minimum
- Building use changes that trigger a new compliance assessment
This means that specifying a door that meets only the BBL minimum is not always sufficient. Architects carry the responsibility of verifying that the specified classification aligns with the full set of applicable requirements for their specific project. When in doubt, consult a qualified fire safety engineer or contact Metacon-Next directly — the correct classification cannot be read from the BBL alone.
What’s the difference between EI1 and EI2 for stairwell doors?
EI1 and EI2 are both classifications for the insulation criterion of a fire-resistant door under EN 13501-2, but they apply different temperature limits on the unexposed face. EI2 permits a higher average surface temperature rise on the cold side, making it a less strict insulation requirement. EI1 applies a stricter limit, meaning the door must prevent more heat transfer during the test period. For stairwell doors, EI1 is the standard classification used in the Netherlands.
The distinction matters in practice because the two classifications are not interchangeable. A door certified as EI2 60 cannot simply be substituted for an EI1 60 requirement — even though both carry the same duration. When a fire safety report or building permit specifies EI1, the installed door must be tested and certified to exactly that criterion. Never accept product documentation that lists only “EI 60” without specifying EI1 or EI2 — that is incomplete information.
For architects, this means checking the classification suffix — not just the duration — when reviewing product documentation. All Metacon-Next fire door classifications are stated in full, including the correct insulation criterion (EI1 or EI2 explicitly), so there is no ambiguity at specification stage.
How is the required fire resistance duration determined for a stairwell door?
The required fire resistance duration for a stairwell door is determined through a project-specific fire safety calculation, not by selecting a number from a fixed table. The calculation considers factors such as building height, occupancy type, evacuation strategy, the size of adjacent fire compartments, and whether compensatory measures are applied elsewhere in the design. Only a qualified fire safety engineer or the local authority (bevoegd gezag) can determine what is required for a specific situation.
In practice, the process works as follows:
- Establish the BBL minimum: Identify the baseline fire resistance duration that applies to the building’s use function and height category under the BBL. This is the absolute minimum — not the final answer.
- Review the fire safety report: The project’s fire safety engineer will specify whether the BBL minimum is sufficient or whether a higher duration is required based on the building’s specific risk profile and any deviations from standard regulations.
- Check for sector or insurer requirements: Certain building types — logistics centres, pharmaceutical production, chemical storage — may face additional requirements under sector-specific regulations such as PGS15, or stricter requirements set by the client or insurer, that push the required duration beyond the BBL minimum.
- Confirm with the competent authority: For permit applications, the local authority (bevoegd gezag) reviews whether the specified classification meets all applicable requirements for that specific project.
Architects should never assume that a standard duration (e.g. EI1 60) automatically applies to every stairwell door in a project. Each opening must be assessed in the context of the fire compartment it separates and the evacuation route it protects. When specifying fire-rated industrial doors for complex projects, having a manufacturer with full technical documentation available from the outset significantly reduces the risk of late-stage corrections.
What documentation should a fire door for a stairwell come with?
A fire door for a stairwell must be accompanied by a complete set of technical and compliance documents. At minimum, this includes a CE declaration of performance (issued under EN 16034 for fire/smoke resistant closing elements and, for industrial doors, also under EN 13241 as the general industrial door standard), an independent fire resistance classification report issued per EN 13501-2 by a recognised test body such as Efectis, and installation instructions. For projects requiring environmental accountability, an Environmental Product Declaration (EPD) based on ISO 14044 and EN 15804 should also be available.
From an architect’s perspective, documentation is not a formality — it is the foundation of a defensible specification. During permitting, a fire safety inspection, or a post-incident review, the installed door must be traceable to a specific classification report that confirms it was tested for the exact configuration in which it was installed. Gaps in documentation create liability exposure for the specifying architect.
The documentation set for a compliant stairwell fire door should include:
- CE declaration of performance — confirming the door meets the essential requirements of the relevant harmonised standards. For industrial fire doors, two CE-relevant standards apply simultaneously: EN 16034 (fire/smoke resisting closing element) and EN 13241 (industrial door, general). These are not interchangeable — both apply.
- Classification report — issued by an accredited test laboratory such as Efectis, showing the tested configuration, fire resistance duration per EN 1634-1, and the applicable classification per EN 13501-2 (e.g. EI1 60, explicitly stating EI1 or EI2)
- Installation instructions — specific to the product and configuration, confirming that the tested performance can be replicated on site
- EPD (Environmental Product Declaration) — increasingly required for BREEAM- and LEED-rated projects, and now available for most Metacon-Next product lines (published in 2025)
- Maintenance instructions — fire doors require periodic inspection and maintenance to retain their classification in service
Metacon-Next publishes all certificates, classification reports, and EPDs directly on its website — without requiring a request or waiting period. For architects who need to close a specification file quickly and with confidence, this level of transparency makes a practical difference. You can contact Metacon-Next directly to confirm documentation availability for a specific product and configuration, or request a project quotation with the relevant technical details included from the start.
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