Spanatherm Cavity Barrier

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FJ240 Spanatherm is a strong preengineered rock fibre movement-joint fire seal, vertical fibre orientation, that allows significant movement accommodation at the same time as providing fire integrity, insulation and an effective smoke seal. FJ240 is a dense rock mineral fibre board Class A1 core with a BC0 aluminium foil applied to two faces. This provides a vapour barrier and a smoke seal when correctly sealed.

Fire Rating: 120 Minutes


FJ240 is a cost effective and efficient product for compartment reinstatement at edge of slab, or vertically, to external fa├žade of the structure. Suitable for both static or movement joints.

Always read SDS, pre-application guidance and relevant application detail prior to application. Ensure the latest documents are downloaded prior to every project commencement.

Maximum tested opening is 400 mm width Movement capability is 7.5% Can only be cut along the product 1200 mm length The Integrity and Insulation rating of FJ240 may be limited to the capability of the surrounding substrates.

Safety data sheet must be read and understood before use.

  • Up to 2 hours integrity and 90 minutes insulation - Tested to BS 476 20-22.
  • Dry fit system.
  • Easy to install.
  • Vapour, smoke and acoustic seal.
  • Can be installed prior to the application of the cladding system.
Nullifire Fire Stopping Brochure (en-GB).pdf Brochure
FJ240 Safety Data Sheet (en-GB).pdf Safety Data Sheets
FJ240 Technical Data Sheet (en-GB).pdf Product Data Sheets