Fire-rated ceiling tiles are specified against two distinct measures: reaction to fire (how the tile itself behaves when exposed to fire) and fire protection (how long a complete ceiling system resists fire passing through it, expressed in minutes). Choosing for compliance means matching the right measure to the building’s fire strategy — and, when replacing, matching exactly what was originally specified. This guide explains both measures, the tiles involved, and how to choose compliantly. It is general information, not fire-engineering advice.
Fire performance for ceilings is two separate things, and confusing them leads to non-compliant choices:
A tile has a reaction-to-fire class on its own; a fire-protection rating belongs to a whole tested system of tile, grid and structure.
For reaction to fire, the material matters. Stone wool (Rockfon Artic) is non-combustible, achieving a top reaction-to-fire classification with minimal smoke — the strongest performer. Mineral fibre (Zentia, Knauf AMF) gives dependable reaction-to-fire performance a step below non-combustible. When a space is specified for a particular reaction-to-fire class, match it — replacing a non-combustible tile with a lesser one reduces the ceiling’s fire performance.
Where a ceiling forms part of a fire-protecting construction — protecting the structure above, such as steel beams, or forming a fire barrier — it is rated in minutes, and this depends on the entire tested system. For example, a Zentia Ultima square edge can offer up to 90 minutes beneath steel and 60 minutes beneath timber as part of a defined build-up. The rating is a property of that tested assembly: the specific tile, the specific grid, installed in the specified way. You cannot achieve or preserve it by matching the tile alone.
Replacing tiles in a fire-rated ceiling is not a place to improvise. If the ceiling was specified for fire performance, the replacement must match the original — substituting a non-rated or differently rated tile can compromise the building’s fire strategy, which is a safety and compliance failure, not just a performance one. Identify what the ceiling was specified for, match it exactly, and where it is a tested fire-protecting system, reinstate that system correctly.
Fire is a regulated area, and this guidance is general rather than fire-engineering advice. Responsibility for specifying the correct fire performance rests with the building’s design and compliance team, and for any fire-protecting ceiling the requirement should be confirmed against the original specification and, where needed, a competent fire professional. RCT can supply tiles to a stated reaction-to-fire class or as part of a tested system, with datasheets, but the specification decision sits with the responsible person for the building.
What does a fire rating on a ceiling tile mean?
Two things: reaction to fire (how the tile behaves — via ‘Class O’ and the Euroclass system) and fire protection in minutes (how long a complete ceiling system resists fire). The minutes rating belongs to a tested system, not the tile alone.
Which ceiling tiles are non-combustible?
Stone wool tiles (Rockfon Artic) are non-combustible, achieving a top reaction-to-fire classification with minimal smoke. Mineral fibre tiles give dependable performance a step below non-combustible. Confirm the class on the datasheet.
How do I get a 60- or 90-minute fire-rated ceiling?
Through a complete tested system of tile, grid and structure installed as specified — not the tile alone. For example, a Zentia Ultima square edge can offer up to 90 minutes beneath steel and 60 beneath timber as part of a defined build-up. Match the tested system.
Do I have to match the fire rating when replacing tiles?
Yes, where the ceiling was specified for fire performance. Substituting a non-rated or differently rated tile can compromise the building’s fire strategy. Match the original exactly, and confirm against the specification and a competent professional where needed.
See fire-classified tiles, including non-combustible stone wool, across our Rockfon, Zentia and other ranges.
Specifying or matching a fire-rated ceiling? Call 01939 251 450 with your requirement — we supply to class or tested system with datasheets. Request a quote.
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