Cavity Barriers

FCFcl FireStop Vertical Cavity Barrier

FCFcl is a non-combustible stonewool based product used to reinstate the fire resistance of wall and floor constructions, including ceiling cavities, and slab edge voids. FCFcl Vertical fire barrier is a foil facing which prevent fibre migration and provides an excellent smoke seal.

The product provides class ‘O’ rating and provides a resilient lateral compression which is required to ensure a tight fit. 

Vertical fire barriers offer superior level of sustainability, with an expected life expectancy of over 25 years. Tested to suit floor and wall voids up to 590mm wide to; EN 1366-4 & BS 476, Classification to EN 13501-2, EN 13501-1, Air Permeability to EN 1026 to 600Pa, and Acoustic Isolation to EN 10140 to 31dB.

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    Tested to EN 1366-4 & BS 476

    Classification to EN 13501-2, EN 13501-1

    Air Permeability to EN 1026 to 600Pa

    Acoustic Isolation to EN 10140 to 31dB

    GWP of 0% Global Warming Potential

    ODP of 0% Ozone Depletion Potential

    Superior Level of Sustainability

    Encased Fibre Migration for Air Plenum Use

    Brackets included in the pack

    Life expectancy of over 25 years

    Contributes to Green Building

    Floor voids up to 590mm wide

    Wall voids up to 560mm wide

  • Building Materials


    Concrete slabs, columns and walls

    Curtain wall assemblies

    Stone cladding, etc.




    Horizontal and vertical cavities between the inner and outer construction elements

    Ceiling Cavity Barriers

    Under Floor Cavity Barriers

    Slab Edge Barriers


  • Description Foil faced structural stone wool composite
    Fire resistance - FCFcl BS467 20 / EN1366-4 up to 120min
    Classification EN 13501-2:2007 + A1:2009 ,ETAG 026
    Thermal 0.35 to 0.36W/mk
    Density 80 kg/m3
    Build Stone wool - 80 kg/m3 intumescent 1.3 g/cm3
    Acoustic (EN10140) 31db
    Air Permeability (EN1026) 600 pa- 100 pa 2.6/4.2 m3/h/m2
    Thickness 75 mm & 100 mm
    Dimensions 1200 x 600 & 1200 x 1200
    Compression Min 10mm
    Brackets Required over cavity of 150 mm (2 per meter)