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Fire Rated Cavity Barriers
Fire Rated Cavity Barriers form a critical part of passive fire protection systems, installed within concealed spaces such as wall cavities, floor voids, and suspended ceilings. Their primary purpose is to restrict the unseen passage of flames and smoke, helping to preserve compartmentation during a fire. This slows fire spread, maintains building integrity for longer, and gives occupants more time to evacuate safely. These barriers are designed to resist fire for a prescribed duration, typically between 30 minutes and 4 hours, depending on the fire strategy and building requirements. For comprehensive protection across structural and service penetrations, they are used alongside complementary fire stopping products.
Nullifire FJ240 Spanatherm
Fire resistant rock fibre expansion joints for slab edging and curtain walling, preventing the spread of smoke and fire. Up to 2 hours fire integrity Vapour and smoke barrier Allows significant movement accommodation 1200 x 600 x 100mm slabs Please contact our technical team on 01132455450 for custom size requirements
Nullifire FJ220 Intubatt 3 Cavity Barrier
A rock fibre compressible slab, with an ablative coating to provide a fire and smoke seal. Supplied pre-configured, ablative coated and factory cured. Choose from 2 options: Single coated for horizontal seals Double coated for vertical seals Low cost and simple install Easy to cut Fully identifiable using Optifire Can offer an...
Tenmat FF102 Ventilated Fire Barriers
Designed to reinstate fire resistance performance within external wall cavities that require permanent (open-state) ventilation in non-fire conditions. It is essential that the correct fire barriers are specified and installed, therefore before you can place your Cavity Barrier order please fill in the application form by clicking on the...
Tenmat Cavguard 65 Cavity Fire Barrier Roll
Designed to reinstate fire resistance performance within external wall cavities, that require permanent ventilation (in non-fire conditions). Provides fire resistance performance within external wall cavities, for periods up to 60 minutes* Suitable for masonry and brickwork external substrates only Ventilated design – developed to allow...
Tenmat NVFB Non-Ventilated Fire Barrier
Designed to maintain fire resistance performance within external wall cavities. For use at: Compartment Floor, Compartment/Party Walls & Around Openings Price on application - please contact our technical team on 0113 2455450 (option 2) or send a message to [email protected] with your project requirements. UL-EU 3rd Party...
Tenmat VFB Plus Ventilated Fire Barrier
“Open state” cavity fire barriers designed to offer fire resistance performance within external wall cavities that require permanent (open-state) ventilation in non-fire conditions. Price on application - please contact our technical team on 0113 2455450 (option 2) or send a message to [email protected] with your project...
Astroflame Clad Ventilated Cavity Fire Barriers
Prevents fire spread and provide compartmentalisation in the external façade. Astroflame fire-rated cavity seals maintain ventilation under normal conditions but expand in a fire to seal the cavity and prevent fire spread. Astro Clad Ventilated Fire Barriers provide essential compartmentalisation for external façades. Before use, all cavity...
FSi Paraflam SEB Cavity Barrier
A perimeter barrier designed for curtain walling, a non-combustible stone wool based product with a foil facing which prevents fibre migration and provides an excellent seal. Dry fit (no cure time required) Easy friction fit system High speed installation Lightweight Testing in voids up to 590mm Provides smoke seal Minimal waste...
Silverliner Open State Cavity Barrier
Developed to protect the voids between the outer façade and the inner construction element of the building. Designed for use in a ventilated façade, the Silverliner OSCB allows for 25mm or 50mm linear air gap to ensure movement of air and drain any moisture within the facade. The aluminium foil restricts fibre migration and offers a class ‘0’...
Rockwool PWCB Cavity Barrier
Manufactured from non-combustible stone wool, encapsulated within a resilient polythene sleeve which eliminates the need for weather protection during installation. Fire resistance up to 60 minutes (EI) Can be used in both vertical and horizontal applications, providing an effective fire, acoustic and thermal barrier within external wall...
Nullifire FV050 Small Ventilated Cavity Barrier - Specification Received
Suited to an open state cavity of up to 50mm, manufactured from a directionally expansive intumescent material encapsulated in a foil barrier. This product is hidden from public view, so it is assumed access to this page has been provided directly by our Technical Team for your current project. If this is not the case, do not proceed to...
Nullifire FV025 Small Ventilated Cavity Barrier - Specification Received
Suited to an open state cavity of up to 25mm, manufactured from a directionally expansive intumescent material encapsulated in a foil barrier. This product is hidden from public view, so it is assumed access to this page has been provided directly by our Technical Team for your current project. If this is not the case, do not proceed to...
Nullifire FV065 Small Ventilated Cavity Barrier Roll - Specification Received
A fire rated product designed to be used as a cavity barrier up to 65mm cavity within external walls. The product is encapsulated in a polythene barrier and made from a flexible intumescent material allowing it to be provided in a roll format. This product is hidden from public view, so it is assumed access to this page has been provided...
Nullifire FV125 Large Ventilated Cavity Barrier - Specification Received
Suited to an open state cavity with a maximum air gap of 25mm and consists of a specially formulated fire rated rock mineral fibre section with an integral high expansion intumescent seal attached to the leading edge. This product is hidden from public view, so it is assumed access to this page has been provided directly by our Technical Team...
Nullifire FV225 Large Ventilated Cavity Barrier - Specification Received
Suited to a ventilated cavity with a maximum air gap of 25mm and consists of a specially formulated fire rated rock mineral fibre section with an integral high expansion intumescent seal attached to the leading edge. This product is hidden from public view, so it is assumed access to this page has been provided directly by our Technical Team...
Nullifire FV144 Large Ventilated Cavity Barrier - Specification Received
Nullifire FV144 Large Ventilated Cavity Barrier is suited to an open state cavity with a maximum air gap of 44mm and consists of a specially formulated fire rated rock mineral fibre section with an integral high expansion intumescent seal attached to the leading edge. This product is hidden from public view, so it is assumed access to this...
Nullifire FV050 Small Ventilated Cavity Barrier
Suited to an open state cavity of up to 50mm, manufactured from a directionally expansive intumescent material encapsulated in a foil barrier. It is essential that the correct fire barriers are specified and installed, therefore in order to make a purchase you must fill in the application form by clicking on the button below. Our technical...
Nullifire FV025 Small Ventilated Cavity Barrier
Suited to an open state cavity of up to 25mm, manufactured from a directionally expansive intumescent material encapsulated in a foil barrier. It is essential that the correct fire barriers are specified and installed, therefore in order to make a purchase you must fill in the application form by clicking on the button below. Our technical...
Nullifire FV065 Small Ventilated Cavity Barrier Roll
A fire rated product designed to be used as a cavity barrier up to 65mm cavity within external walls. It is essential that the correct fire barriers are specified and installed, therefore in order to make a purchase you must fill in the application form by clicking on the button below. Our technical team will then contact you with the...
Nullifire FV125 Large Ventilated Cavity Barrier
Suited to an open state cavity with a maximum air gap of 25mm and consists of a specially formulated fire rated rock mineral fibre section with an integral high expansion intumescent seal attached to the leading edge. It is essential that the correct fire barriers are specified and installed, therefore in order to make a purchase you must...
Nullifire FV225 Large Ventilated Cavity Barrier
Suited to a ventilated cavity with a maximum air gap of 25mm and consists of a specially formulated fire rated rock mineral fibre section with an integral high expansion intumescent seal attached to the leading edge. It is essential that the correct fire barriers are specified and installed, therefore in order to make a purchase you must fill...
Nullifire FV144 Large Ventilated Cavity Barrier
Nullifire FV144 Large Ventilated Cavity Barrier is suited to an open state cavity with a maximum air gap of 44mm and consists of a specially formulated fire rated rock mineral fibre section with an integral high expansion intumescent seal attached to the leading edge. It is essential that the correct fire barriers are specified and installed,...
Nullifire FJ260 Cavity Barrier
Nullifire FJ260 Cavity Barrier is a close state cavity barrier made of rock mineral wool and designed to maintain the required fire resistance around windows, doors and when following fire compartment lines. It is essential that the correct fire barriers are specified and installed, therefore in order to make a purchase you must fill in the...
Tenmat VFB 60/60
’Open state’ cavity fire barriers for ventilated cavities of up to 450mm. Each VFB 60/60 consists of a specially formulated fire rated stone mineral wool section with an integral high expansion intumescent seal fixed to the leading edge. 3rd Party Certification - IFC Certification Typical Fire Ratings of minimum 60 Minutes Integrity and...
Tenmat VFB 120/120
An ’Open State’ cavity fire barrier system for ventilated cavities of up to 450mm. Consists of a specially formulated fire rated stone mineral wool section with an integral high expansion intumescent seal fixed to the leading edge. 120 minutes integrity and insulation fire rating for up to 300mm cavities 90 Minutes Integrity and...
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Effective Compartmentation with Fire Rated Cavity Barriers for Passive Fire Protection
Fire Rated Cavity Barriers are passive fire protection components designed to block the hidden spread of fire and smoke through concealed spaces. These barriers are vital in wall and floor cavities, roof voids, and facade systems. By preserving the integrity of fire compartments, they help contain fire within its point of origin and delay spread, supporting safe evacuation and firefighting operations.
Used alongside other passive systems such as fire doors and partition walls, cavity barriers can also be combined with surface treatments like Fire Retardant Paints to achieve full compliance with compartmentation standards. Cavity barriers are particularly important where services pass through fire-resisting construction, as any unprotected void could compromise the barrier's performance. UK regulations require that all such penetrations and joints be appropriately sealed for a duration equal to the compartment's fire rating.
All fire protection components, including cavity barriers, must be selected based on valid fire test evidence and installed exactly as tested. Fire resistance classifications - covering integrity and insulation - are achieved only when barriers are fitted in accordance with manufacturers’ specifications and tested scenarios.
Fire Rated Cavity Barriers FAQs
Are cavity barriers suitable for all wall types?
No. Fire performance depends on the wall's construction. A system tested in a block wall may not perform the same in a drylining system unless both are separately tested.
How do cavity barriers contribute to fire integrity?
They prevent gaps forming between compartments, stopping the passage of smoke and flame across concealed voids.
Can a single fire test apply to all barrier installations?
No. Tests apply only to the specific configuration tested. Variations must be assessed by fire consultants or verified with assessments.
Do cavity barriers offer insulation as well as integrity?
Yes. Effective cavity barriers limit heat transfer, ensuring the unexposed side doesn’t rise above specified temperatures, reducing ignition risk.
Are cavity barriers third-party certified?
Many are, and third-party certification is increasingly required at the design stage. It provides assurance of tested performance, traceability, and manufacturing quality control.