Ro-Ro and Vehicle Spaces: New Fire Detection and Protection Requirements (2026)
For new passenger ships from 2026, SOLAS II-2/20 requires individually identifiable detection in the relevant spaces. Cargo and existing ships follow different provisions: check category, date and space type together.
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.
Individual smoke and heat identification concerns passenger ships constructed on or after 1 January 2026 under II-2/20.4.1.1–4. New cargo ships follow the separate section 4.1.5. Construction includes keel laying or an equivalent stage; do not use delivery date alone. Detector approval and testing must address normal ventilation conditions in the space. MSC.550(108) · MSC.555(108).
What falls on existing ships is something else, and there are three of them. The new §20.2.1.3 lists them: “Passenger ships constructed before 1 January 2026, including those constructed before 1 July 2012, shall also comply with regulations 20.4.1.6, 20.4.4 and 20.6.2.3”. In order: heat detectors where a smoke detector already exists; a video monitoring system with recording; and a fixed water-based fire extinguishing system based on monitors protecting the weather decks intended for the carriage of vehicles. All three by the first survey on or 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. The package was adopted on 23 May 2024 and is in force from 1 January 2026.
What applies to new ships. The chapeau of §20.4.1 is explicit: “The requirements of paragraphs 4.1.1 through 4.1.4 shall only apply to passenger ships constructed on or after 1 January 2026”. That covers the individually identifiable detection system (§20.4.1.1), combined smoke and heat detection, the alignment of detection sections with the drencher system sections (§20.4.1.2), the alarm presentation interface (§20.4.1.3) and detection on the weather deck used for vehicles, with different settings alongside and at sea (§20.4.1.4). For cargo ships §20.4.1.5 applies, again only from the same date. On ro-ro passenger ships constructed on or after 1 January 2026 §20.6.2.1 (fixed water-based system based on monitors complying with the FSS Code) and §20.6.2.2 (drainage sized for not less than 125% of the combined capacity of the monitors and of the required fire hoses) apply as well.
What applies to existing ships. The parent provision is §20.2.1.3, which points to three paragraphs, each with its own transitional clause set at the first survey on or after 1 January 2028. §20.4.1.6: on passenger ships constructed before 1 January 2026, “including those constructed before 1 July 2012”, detection shall provide “smoke and heat detection throughout vehicle, special category and ro-ro spaces”, with heat detectors subject to the same spacing and coverage rules as smoke detectors — and required “only… where there is already a smoke detector”. §20.4.4: continuous video monitoring of vehicle, special category and ro-ro spaces, with recording available for replay at a continuously manned control station or at the safety centre; for existing ships the minimum replay period is 24 hours, against the 7 days required of new ships. §20.6.2.3: “a fixed water-based fire extinguishing system based on monitor(s) shall be installed in order to protect areas on weather decks intended for the carriage of vehicles”, each monitor rated at least 1,250 L/min, with lower flow rates permitted by the Administration where the required rate is not practical given the size and arrangement of the ship, and alternative arrangements permitted for ships that had already installed a monitor-based system before 1 January 2026.
For relevant existing passenger ships prepare a complete plan for the three duties in II-2/20.2.1.3. Timing, costs, yard work and integration with existing systems depend on the ship; neither cameras nor additional detectors can be excluded from planning on a generic estimate.
Scope of Application
Passenger ships constructed from 1 January 2026 follow II-2/20.4.1.1–4, including individual identification. Cargo ships from that date follow the separate §20.4.1.5 without adding individual identifiability unless required by system approval. Existing passenger ships follow the retroactive duties by the first survey from 1 January 2028.
Procedure / How to Complete It
- Identify ship category, construction date and space type.
- For new passenger ships check §§20.4.1.1–4, including individual identifiability.
- For new cargo ships check §20.4.1.5 without importing the passenger requirement.
- For existing passenger ships plan §§20.4.1.6, 20.4.4 and 20.6.2.3 by the applicable survey.
Practical Example
Example: a new ro-ro passenger ship with keel laid in March 2026 requires design verification against sections 20.4.1.1–4. An identifiable detector helps locate the alarm, but response and evacuation still follow the emergency plan; addressability does not establish that evacuation is unnecessary.
What Typically Goes Wrong
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 of existing ships built around individually identifiable detection | Spending directed at a requirement that does not exist for existing ships (§20.4.1 applies only to ships constructed on or after 1 January 2026), while the three obligations of §20.2.1.3 stay uncovered | Start from the list in §20.2.1.3 — §§20.4.1.6, 20.4.4 and 20.6.2.3 — and plan all work based on a technical survey and approval lead times |
| Retroactive regime narrowed to ro-ro passenger ships only | Passenger ships with vehicle or special category spaces that are not ro-ro left out of the planning, although they are addressees of §20.2.1.3 and of the section 6 chapeau | Read the addressee in the text: “passenger ships”, and “passenger ships with vehicle, special category or ro-ro spaces”, not “ro-ro passenger ships” |
| 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 |
What the PSCO Checks
Operational Tips
- Always verify the ship's keel-laying date before assuming which SOLAS II-2/20 and FSS Code requirements apply.
- Plan all applicable retrofits: monitors, detection and video. Lead times, yard work and priorities depend on the ship’s arrangement and statutory deadline.
- §20.6.2.3 leaves the Administration two points of flexibility: flow rates below 1,250 L/min where the required rate is not practical given the size and arrangement of the ship, and alternative arrangements for ships that already had a monitor system before 1 January 2026. Both are to be settled with the flag in advance, not invoked at the survey.
- Clearly distinguish between detection requirements (FSS Code Chapter 9) and extinguishing requirements (FSS Code Chapter 7, water-based systems and monitors): they are distinct amendments within the same regulatory package.
Preparation checklist
- Category/date/space identified
- New passenger: §§20.4.1.1–4 checked
- New cargo: §20.4.1.5 checked separately
- Existing passenger: retroactive measures planned
FAQ
Related Topics
Last substantive revision of this page: 16 September 2026 · page fingerprint db55872a9682