Rockwool 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. The 50mm Rockwool cavity fire barrier offers up to 120 minutes of fire resistance, it is an essential passive fire protection solution for commercial and residential buildings.

Key Features:

• Provides up to 2 hours (EI 120) fire resistance when installed correctly
• Non-combustible stone wool – Euroclass A1 fire rating
• Suitable for concrete soffits, timber trusses, and voids above partitions
• Compatible with service penetrations and single-leaf timber door sets
• Faced with foil on one or both sides for added durability and handling
• Quick and easy to install with minimal maintenance required
• Made from natural stone – contains no ODP or GWP gases

Specifications:

• Product Size: 50mm (thickness) x 1000mm (width) x 3800mm (length)
• Coverage: 3.8m² per roll
• Density: Approx. 100 kg/m³
• Fire Rating: Up to EI 120 minutes (BS EN 1364-1:2015 tested)
• Facing: Single-sided black foil (also available with double foil)

Fire Barrier Applications:

• Concrete soffits and structural steel protection
• Timber truss systems (parallel and perpendicular)
• Voids above plasterboard partitions
• Around service penetrations (e.g., pipes, ducts, cable trays) and door heads to maintain fire integrity.

ROCKWOOL Fire Barrier EN is classified to BS EN 13501-2, with performance derived from tests to BS EN 1364-1 and BS EN 1634-1. In the right build-ups it achieves up to EI 120, and it’s been tested with both concrete and timber supporting constructions, service penetrations, and even in conjunction with a fire-resisting single-leaf timber doorset. The roll is wire-reinforced for stability and is typically fixed with a proprietary angle support and clamping plate. Its stone-wool core is also acoustically absorbent, helping cut flanking transmission through ceiling voids and above partitions.

From a compliance and sustainability angle, the product contains no gases with ODP or GWP, is recyclable, and has no hazardous classification under EU/UK REACH. For specifiers, it aligns with common NBS clauses for cavity barriers in partitions and suspended ceilings (K10/P10).

The full datasheet is available for download here.