The NVELOPE® CFB 12/50 ventilated fire barrier is a rigid, high expansion intumescent strip encased in aluminium foil.

It is mechanically fixed horizontally within ventilated cavities behind rainscreen or cladding systems to act as a cavity fire barrier.
NVELOPE Fire Cavity Barrier Survey


  • Up to 120 minutes integrity and insulation Fire Rating
  • Maintains a 44mm air gap
  • Up to 50mm cavities 
  • Minimum In Service Life: 60 years based on typical UK conditions 
  • Developed to allow maximum ventilation and drainage of cavities reducing the need for cavity trays or weepholes 
  • Durability and Age tested 
  • Simple to install 

Safety at the forefront

Passive cavity fire barriers are an accepted method to support the achievement of fire safety requirements. These functional requirements are defined within UK Building Regulations and further practical guidance is described within ADB. Strategies to remediate at risk buildings are latterly considering passive fire control, including cavity fire breaks, in addition to the façade panel and insulation.

Cavities in the construction of a building provide a ready route for the spread of smoke and flame, which can present a greater danger as any spread is concealed.


Fixings for Cavity Fire Barriers

For Barrier Brackets
For Direct Fix
NVELOPE Fire Cavity Barrier Survey

You may also be interested in...