The Fire Safety of Stone Wool
With millions of urban fires each year, safe building materials matter more than ever.
Stone wool has very low calorific content, which makes it certifiably non-combustible. It will not contribute to fire development, produce significant smoke, or create flaming droplets during a fire.
Safe Building Materials
As fires develop more than six times faster than in the 1950s, fire safety is more critical than ever in the construction and renovation of buildings.
Every building material contributes to fire safety, and acoustic ceiling and wall solutions are an important part of that protection.
Non-Combustible
Rockfon stone wool is made from volcanic rock and is typically non‑combustible, meaning it adds minimal or no fuel to a fire.
It won’t ignite or burn, helping slow fire spread naturally without the need for toxic flame retardants.
Certifications
Most Rockfon stone wool solutions are rated A1 under EN 13501‑1, the highest reaction‑to‑fire class. Rockfon ceiling grids are also A1, strengthening full‑system safety.
Fire ratings are listed in product data sheets and Declarations of Performance.
Euroclass Ratings
Reaction to fire is classified under the Euroclass system defined in EN 13501-1. Ratings range from A1 to F and indicate how combustible a product is and how much it contributes to fire growth.
Combustibility Levels
A1 products are non-combustible and will not contribute to fire at any stage, including a fully developed fire. A2 and B have limited combustibility, while C to F are combustible and contribute increasingly to fire spread.
Smoke & Droplets
Euroclass ratings also include smoke and flaming droplet subclasses. S refers to smoke generation, from S1 with little or no smoke to S3 with substantial smoke. D refers to flaming droplets, from D0 with none to D2 with high volumes.
Safer Ceilings
In a fire, ceiling materials can impact visibility, smoke inhalation, and burn risk. A1 non-combustible materials do not produce smoke or flaming droplets.