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Cavity Fire Stop - Cavity Seal

A cavity fire barrier for installation behind external wall systems.
A cavity fire barrier for installation behind external wall systems.


Our Price: £8.17
Price includes VAT



Cavity Fire Stop / Ventilated Fire Barrier

Fire stop material for installation behind ventilated external wall systems. Allows air circulation in normal conditions but, in the event of a fire, expands to seal the ventilated cavity and stops the passage of flames and smoke.

  • 30 to 120 minutes rating (depends on seal version and building construction materials)
  • For Horizontal or Vertical fixing.
  • Fire & Age Tested
  • Independently tested to BS standards
  • 25mm to 125mm cavity gap size solutions.
  • Tested on Timber and Masonry external wall systems.


  • Sold in 1m lengths.
  • Available in three types, all using high expansion intumescent strip material.
  • Self-adhesive backed and finished with an aluminium foil for weather protection, rapidity of activation and char durability once activated.

1) 35mm x 4mm x1000mm encased in aluminium foil

  • Maximum cavity size; 25mm
  • Maximum free area; 83%
  • Fire ratings:
  • Minimum 30 minutes in Timber Structures
  • 120 minutes in Non-Combustible Structures

2)  75mm x 6mm x1000mm encased in aluminium foil

  • Maximum cavity size; 50mm
  • Maximum free area; 87%
  • Fire ratings:
  • Minimum 30 minutes in Timber Structures,
  • 90 minutes on cement board
  • 120 minutes in Non-Combustible Structures


3) 50mm x 50m x1000mm encapsulated in red polythene

  • Maximum cavity size: 125mm
  • Maximum free area: 60%
  • Fire ratings:
  • Minimum 30 minutes in Timber Structures
  • Minimum 30 minutes fitted between Phenolic Insulation
  • Polythene wrapped and can be used both horizontally and vertically.
  • Fixing spikes provided.

Further information here:

Please Note: This product will NOT be dispatched until approved by our technical team. So this product may not apply for next day delivery.


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As part of our policy of ongoing improvements, we reserve the right to modify, alter or change product specifications without giving notice. Product illustrations are representations only. All information provided is for guidance only, and as (part of the Stormflame Group) has no control over the specific application or installation methods of the products, or of the prevailing site conditions, no warranties expressed or implied are intended to be given as to the actual performance of the products mentioned or referred to, and no liability whatsoever will be accepted for any loss, damage or injury arising from the use of the information given of products mentioned or referred to herein.

Information provided is to the best of our knowledge true and accurate and based upon current test data and product specification from third parties and is supplied for your guidance only. Customers should satisfy themselves to the suitability of the product based on the products limitation of applications and that the product is fit for purpose for their intended use and no guarantee is given or implied since the conditions of actual use are beyond our control. (part of the Stormflame Group), disclaim any liability for loss, damage or other expense arising from the use of information, data or products mentioned or referred to by ourselves and reserve the right to change any details or specifications without notice. If you are in any doubt as to the suitability of a product for your intended application please contact our technical team on 01329 841 416 or email and we will contact you.