FIREFLY® FB180 Ablative Batt Floor System – 60mm EI60/EI90 Fire-Rated Retrofit Solution

Single-Layer Horizontal Firestop System for Retrofitting Timber Floors

The FIREFLY® FB180 Ablative Batt – Floor System (60mm) delivers an efficient, non-load-bearing horizontal fire compartmentation solution for retrofit applications, offering 90 minutes of fire integrity and 60 minutes insulation (EI60/EI90). Specifically designed for friction-fitting between 90 × 38mm timber joists, the system enables upgrades to fire performance without disturbing ornate, lathe, or plaster ceilings—making it ideal for use in historic or multiple occupancy buildings.

Constructed from mineral wool coated with a dual-side ablative finish, the 60mm batt offers rigid support, acoustic reduction (27dB), and seamless integration with FIREFLY® flexible fire barriers and fixings. Tested to BS EN 1363-1:2020 and BS EN 1364-2 (unloaded floors), this system is approved for use with common penetrations including soil pipes, cable trays, and insulated metal pipes.

✅ Key Features:

• Provides EI90/EI60 fire rating (90 minutes integrity, 60 minutes insulation)

• Fully tested to BS EN 1363-1:2020 and BS EN 1364-2 (unloaded floors)

• Friction-fits between timber joists – no additional support required

• Ideal for retrofit installs above ornate ceilings in listed or occupied properties

• Approved for common service penetrations like soil pipes and cables

• Compatible with FIREFLY® barriers, acrylic sealants, and intumescent coating

• Delivers 27dB acoustic insulation

• Detailed installation drawings and guidance available

🧱 Application Areas:

• Horizontal compartmentation upgrades above ceiling voids

• Retrofit fire protection in buildings with existing decorative finishes

• Service-heavy areas with multiple penetrations

• Compatible with timber joist construction (minimum 90 × 38mm C16 softwood)

🧪 Material Specifications:

• Construction: Mineral fibre batt with ablative coating on both sides

• Density: 180kg/m³

• Dimensions: 1200 × 600 × 60mm

• Weight: Approx. 7.78kg per board

• Fire resistance: EI60 / EI90 certified

🔧 Installation Overview:

• Timber joists must be coated with FIREFLY® Ablative Coating

• Batts are cut 2mm oversized and friction-fitted between joists

• All joints sealed with FIREFLY® Intumescent Acrylic (6mm bead)

• Small gaps (<3mm) filled with Acrylic; no exposed fibres or wood left visible

• Suitable for fitting from above or below with access constraints considered

⚠️ Safety & Handling:

• Not classified as hazardous under CLP

• May cause minor irritation from airborne dust—use PPE

• Store dry and frost-free; not suitable for environments with RH >85%

• Do not expose to rain or stack in unstable arrangements