NVELOPE® Cavity Fire Barrier


Developed by the UK’s leading rainscreen subframe provider, the SFS NV CFB cavity fire barrier offers project specific fire safety requirements


The NV CFB system has been created for Designers and Specialist Cladding Contractors who demand a clear and straight forward approach to aid the selection and supply of subframe cavity fire barriers. The requirement to prevent fire breaking into and spreading within the cavity of a rainscreen build-up has gained a high degree of traction in the UK and further a field in certain international regions.
NVELOPE Fire Cavity Barrier Survey

What are Cavity Fire Barriers?

The basic principle of a ventilated rainscreen system allows any penetrating rain or moisture to ‘drain’ or evaporate and vent back to the outside. Further the effects of pressure equalisation allow the movement of air between the inside and outside so that rain is not driven through into the building structure. During a fire event however this freedom of movement could act as a chimney and draw smoke and fire along the cavity. That's where Cavity Fire Barriers come into effect, designed to maintain the ventilated cavity in normal conditions but will rapidly expand to seal off the gap in the event of a fire. 

Finding the right solution for your project

Our solutions are suitable for a wide range of cavity sizes and constructions. Check out our range of Cavity Fire Barriers below:
NV CFB 6
An open state cavity fire barrier for ventilated cavities up to 450mm. Utilises a high performance intumescent seal fixed to a  high density mineral wool backer.  It is mechanically fixed and usually orientated horizontally.

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NV CFB 12
An advanced open state cavity fire barrier for ventilated cavities up to 450mm. Utilises an high performance intumescent seal fixed to a high density mineral wool backer which offer extended performance over and above CFB 6. It is mechanically fixed and usually orientated horizontally.

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NV CFB EXTRA
The superior open state cavity fire barrier for ventilated cavities up to 450mm which provides additional protection for larger air gaps up to 44mm. Utilises an high performance intumescent seal fixed to a high density mineral wool backer which offers extended performance over and above CFB 6. It is mechanically fixed and usually orientated horizontally.

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NV CFB UV
This is a barrier for non ventilated applications and is ideally suited to prevent fire penetration between adjacent vertical compartments within a rainscreen. Manufactured from high density mineral wool to suit a wide range of cavity depths. They are held in place by a combination of compression and multi purpose brackets.

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NVELOPE Fire Cavity Barrier Survey

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