Rockwool Fire Barrier EN is a wire-reinforced cavity fire barrier designed to prevent the spread of fire and smoke through concealed spaces such as ceiling voids, roof voids, and above partition walls. It provides up to 120 minutes fire resistance (EI 120) when installed correctly and is commonly used in both residential and commercial buildings to meet fire safety regulations.
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Apply for a Trade AccountRockwool Fire Barrier EN is a high-performance, wire-reinforced stone wool insulation designed to prevent the spread of fire and smoke through concealed spaces such as ceiling voids and above partition walls. Offering up to 120 minutes of fire resistance (EI 120), it is a key passive fire protection solution for both residential and commercial buildings.
If a building design includes concealed voids that could allow fire to spread unseen, a cavity fire barrier like this is typically required to meet Building Regulations.
View our full range of fire barrier products, or explore our wider insulation range, including loft insulation.
| Product Type | Use Case |
|---|---|
| Fire Barrier EN | Large concealed voids (ceilings, roof spaces) |
| Cavity Barrier | Smaller cavities (walls and façades) |
Fire Barrier EN is designed for larger concealed voids, whereas cavity barriers are typically used within wall cavities.
Rockwool Fire Barrier EN is classified to BS EN 13501-2, with performance derived from testing to BS EN 1364-1 and BS EN 1634-1. When installed as part of a tested system, it can achieve up to EI 120 fire resistance.
The product has been tested with both concrete and timber supporting constructions, including service penetrations and fire-resisting door sets, helping maintain compartmentation integrity. The wire-reinforced roll provides stability and is typically installed using proprietary angle supports and clamping plates.
In addition to fire performance, the stone wool core offers acoustic absorption, helping to reduce flanking sound transmission through ceiling voids and partitions.
From a sustainability perspective, the product contains no gases with ODP or GWP, is recyclable, and has no hazardous classification under EU/UK REACH. It also aligns with common NBS clauses for cavity barriers in partitions and suspended ceilings (K10/P10).
The full datasheet is available here.
| Weight | 10 kg |
|---|---|
| Length | 3800mm |
| Material | Rock Mineral Wool |
| Width | 1000mm |
| Euroclass Reaction to Fire Classification | A1 |
| Thickness | 50mm |
| Fire Rating | Up to 120mins |
Rockwool Fire Barrier EN is typically installed in concealed voids where fire could spread unseen, such as ceiling voids, roof spaces, and above partition walls. It is also used around service penetrations and at junctions between walls and soffits to maintain fire compartmentation.
When installed as part of a tested system, Rockwool Fire Barrier EN can provide up to 120 minutes fire resistance (EI 120). The exact performance depends on the specific construction build-up and installation method.
Fire barriers like Rockwool Fire Barrier EN are designed for larger concealed voids such as ceiling and roof spaces, helping to compartmentalise fire over wider areas. Cavity barriers are typically used in smaller cavities within walls or façades to restrict fire spread within those spaces.
In many cases, yes. Building Regulations require fire compartmentation to prevent the spread of fire and smoke through concealed spaces. If a building design includes voids such as ceiling or roof spaces, fire barriers like Rockwool Fire Barrier EN are often required as part of a compliant fire protection system. Requirements will depend on the specific building type and layout, so it’s important to follow approved guidance and tested system details.
