Fire Ratings for Ceiling Tiles: Matching the Fire Performance You Need

To match fire performance specifications for ceiling tiles, you must replace them like-for-like. This is because the fire rating of a ceiling is part of the building’s safety system, not a cosmetic element. There are two things to consider: how a tile reacts to fire (its behaviour when exposed to fire) and the ceiling system’s fire containment (how long it keeps a fire from spreading). This guide addresses both and how to safely match them when replacing tiles.

Two kinds of fire performance

The fire safety performance of ceilings can be divided into two distinct areas:

Reaction to fire – how the tile itself behaves in a fire: whether it ignites, contributes fuel and produces smoke. This is often referred to using the now obsolete ‘Class O’ and European Euroclass system (A1, A2, etc.).
Fire resistance / protection – how long an entire ceiling system prevents fire and heat from passing through, in minutes (e.g. 30, 60, 90 min).

Each tile has its own reaction-to-fire classification, whereas the fire protection rating is for the entire tested system of tile, grid, and supporting structure.

Reaction to fire

Most mineral fibre and stone wool tiles are rated highly in reaction to fire. Stone wool (Rockfon Artic) is actually non-combustible, thus receiving a top reaction-to-fire class with minimal smoke production. Mineral fibre (Zentia, Knauf AMF) provides reliable reaction-to-fire performance one step below non-combustible. Thus, for matching, replace a non-combustible tile with another non-combustible tile, and avoid lowering the reaction-to-fire class of a ceiling.

Fire protection in minutes

Some ceilings are part of a fire-protecting Construction items are rated to hold a fire back for a specified time — 30, 60 or 90 minutes — usually protecting the structure above (such as steel beams) or forming a barrier. This rating is dependent on: entire tested systema specific tile, a specific grid, installed in a specific manner. For example, a Zentia Ultima square edge tile can provide up to 90 minutes protection under steel and 60 minutes under timber as part of a defined build-up. You cannot achieve or maintain this rating by simply matching the tile.

Why matching matters for safety and compliance

If a ceiling was installed for the purpose of providing fire protection, replacing it with a tile of a lower or differently rated tile can compromise the building’s fire safety strategy — it is not just a performance issue, it is an issue of safety and compliance. On any ceiling that is part of fire protective construction, the tile replacement must be of the same rating and the documentation must be provided for the fire file of the building.

How to match fire performance

Establish what the ceiling was specified for — a simple reaction-to-fire requirement, or a fire-protection (minutes) rating.
For reaction to fire — match the same class; replace non-combustible with non-combustible.
For fire protection — match the exact tested system (tile, grid and build-up), not just the tile.
Confirm on the datasheet — check the classification of the current product or an equivalent.
If unsure, ask — don’t guess on fire; confirm the specification with the supplier or a fire consultant.

A note on responsibility

The information and guidance in this document regarding fire performance is at best general guidance. This area is regulated, and fire performance as an engineering discipline is not the scope of this guide. For any ceiling that is a component of a building’s fire protection, verify the requirement against the original specification and, if necessary, with a qualified fire consultant. RCT will provide tiles that meet a defined reaction-to-fire class or tested system, along with supporting data, but the obligation to determine the required fire performance remains with the building design and compliance team.

Frequently Asked Questions

What fire ratings do ceiling tiles have?

There are two categories: reaction to fire (the behaviour of the tile — this is referred to as ‘Class O’ and within the Euroclass framework), and fire resistance (the duration of a complete ceiling system’s resistance to fire, e.g. 30, 60 or 90 minutes). The minute classification belongs to the system as a whole, not just the tile.

Must I consider the fire rating when replacing tiles?

Yes, this is the case when the ceiling in question was specified for fire protection performance. Using a non-rated or otherwise rated tile will breach the building’s fire strategy — this is a compliance and safety matter. The original tested specification must be used.

Which ceiling tile is best in terms of reaction to fire?

Stone wool tiles (Rockfon Artic) are classified as non-combustible and contribute very little to smoke production. When it comes to fire response classification, mineral fibre tiles (Zentia, Knauf AMF) offer reliable performance one class below non-combustible.

Can I achieve a fire rating of 60 minutes with the appropriate tile?

Not with the tile alone. The fire protection rating measure in minutes is attributed to an entire tested system of tile, grid and structure, when installed in a specific manner. You must replicate the tested build-up and refer to the specification and datasheets.

See fire-classified tiles across our Rockfon, Zentia and other brand ranges, with datasheets available.

Matching a fire-rated ceiling? Call 01939 251 450 In relation to your specifications, we will furnish you with the necessary documentation and supply to the appropriate classification or tested system. Request a quote.