Operational Guide · Registers & Logbooks

# Ro-Ro and Vehicle Spaces: New Fire Detection and Protection Requirements (2026)

From 1 January 2026 smoke and heat detectors in vehicle, special category and ro-ro spaces must be individually addressable: it is no longer enough to know that a detector has sounded, you need to know exactly which one.

SOLAS II-2/20 FSS Code Chapter 9 Ro-Ro vehicle spaces fire detection

## Operational Explanation

Resolution MSC.550(108) amended SOLAS Regulation II-2/20 (Protection of vehicle, special category and Ro-Ro spaces), while Resolution MSC.555(108) amended Chapter 9 (fixed fire detection and alarm systems) of the FSS Code. Together, these two amendments redesign how spaces carrying vehicles must be monitored and protected against fire.

The most significant practical change concerns individual detectability: for ships with keels laid from 1 January 2026, smoke and heat detectors installed in vehicle, special category and ro-ro spaces must be individually addressable, so that the alarm system precisely identifies which detector triggered the alarm and not just the general zone. Linear heat detectors are also permitted, provided they are tested under the normal ventilation conditions expected for the space. For existing ro-ro passenger ships, the retrofit is required by the first survey due after 1 January 2028.

This topic is distinct from the subject of fixed extinguishing systems (CO2, water mist), already covered in another topic of this module: here the focus is on the categorisation and structural/detection protection of ro-ro and vehicle spaces, not on the delivery systems for the extinguishing agent.

## Regulatory Reference

Resolution MSC.550(108): amendments to SOLAS Regulation II-2/20 (protection of vehicle, special category and Ro-Ro spaces), including new requirements for exposed decks intended for vehicle carriage. Resolution MSC.555(108): amendments to Chapter 9 (fire detection and alarm) of the FSS Code, requiring individually addressable smoke/heat detectors. Applicable to ships with keels laid from 1 January 2026; for existing ro-ro passenger ships, retrofit by the first survey due after 1 January 2028.

## Scope of Application

Cargo ships and ro-ro passenger ships with keels laid from 1 January 2026, fitted with vehicle, special category or ro-ro spaces; existing ro-ro passenger ships subject to retrofit by the first survey due after 1 January 2028.

## Procedure / How to Complete It

1. Verify the ship's keel-laying date to determine whether the new SOLAS II-2/20 and FSS Code Chapter 9 requirements apply from 2026.
2. For new construction, verify that the smoke and heat detectors installed in vehicle/special category/ro-ro spaces are individually addressable.
3. If linear heat detectors are used, verify that they have been tested under the normal ventilation conditions expected for the specific space.
4. For existing ro-ro passenger ships, plan the detection system retrofit in good time in view of the first survey due after 1 January 2028, avoiding leaving it until close to the deadline.
5. Verify the compliance of exposed decks intended for vehicle carriage with the new protection requirements introduced by the amended Regulation II-2/20.

## Practical Example

Example: a shipyard laying the keel of a new ro-ro ship in March 2026 designs the vehicle space detection system with individually addressable detectors, so that in the event of an alarm the fire control system indicates exactly which detector triggered it, allowing a targeted response instead of a generic evacuation of the whole zone.

## Real Cases

Existing ro-ro passenger ships that postpone planning the detection system retrofit, counting on the 2028 deadline as distant, risk having to act within a tight timeframe at the first survey due after that date, with unplanned costs and off-hire time — a pattern already observed for other SOLAS retrofits with survey-linked deadlines.

## Common Mistakes Mistake Library

Mistake | Consequence | How to avoid it
--- | --- | ---
Keel-laying date not verified to determine applicability of the new 2026 requirements | Detection system design not compliant with the requirements applicable to the ship | Always verify the keel-laying date against the applicability dates of Resolutions MSC.550(108) and MSC.555(108)
Retrofit for existing ro-ro passenger ships postponed without planning, relying on the 2028 deadline | Unplanned intervention close to the first survey due after 2028, with risk of unforeseen off-hire time | Plan the detection system retrofit in good time, integrating it into the ship's survey and maintenance programme
Linear heat detectors installed without verifying testing under the specific ventilation conditions of the space | Non-compliance of the detection system with the amended FSS Code Chapter 9 requirements | Always verify that linear detectors have been tested under the normal ventilation conditions expected for the space in which they are installed

## PSC Observations

For ships subject to the new requirements, PSCOs may verify the compliance of the fire detection system in vehicle/special category/ro-ro spaces, including the individual addressability of the detectors, and, for existing ro-ro passenger ships, the progress of the retrofit against the first survey due after 2028.

## Operational Tips

- Always verify the ship's keel-laying date before assuming which SOLAS II-2/20 and FSS Code requirements apply.
- Don't wait for the 2028 deadline to plan the retrofit on existing ro-ro passenger ships: shipyard lead times require advance planning.
- Clearly distinguish between detection requirements (FSS Code Chapter 9) and extinguishing requirements (FSS Code Chapter 7, CO2/water mist): they are distinct amendments within the same regulatory package.

## Checklist

- Keel-laying date verified against the applicability of the new 2026 requirements
- Individually addressable smoke/heat detectors installed in vehicle/special category/ro-ro spaces (new construction)
- Linear heat detectors tested under the ventilation conditions expected for the space
- Retrofit planned for existing ro-ro passenger ships in view of the first survey due after 2028
- Compliance of exposed vehicle-carrying decks with the new protection requirements verified

## FAQ

What does Resolution MSC.550(108) introduce?
Amendments to SOLAS Regulation II-2/20 on the protection of vehicle, special category and Ro-Ro spaces, including new provisions for exposed decks intended for vehicle carriage.
What does it mean for a detector to be individually addressable?
That the fire alarm system must be able to precisely identify which specific detector triggered the alarm, not just the general zone in which it is located, allowing a more targeted response.
Since when do these requirements apply, and with what exceptions for existing ships?
They apply to ships with keels laid from 1 January 2026; for existing ro-ro passenger ships, a retrofit is required by the first survey due after 1 January 2028.
🎬 Additional photos, videos and interactive diagrams for this topic will be available in a future version of the platform.

## Related Topics

Fixed Firefighting Systems: CO2 and Water Mist Fire Drill and Fire Safety

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