Many external cavities such as those formed by rainscreens, cladding or external facade systems are designed with an open cavity to provide back ventilation. The cavity acts like an open chimney to allow for ventilation, moisture dissipation and in some cases, to create a back pressure to repel rain ingress. However, in a fire situation this chimney effect creates an open path for the hidden spread of fire both vertically and horizontally behind the external façade or cladding system.
Building Regulations require that Cavity Fire Barriers be installed within the cavity to prevent fire spread. TENMAT’s range of Ventilated Fire Barriers maintain the ventilated cavity, but, in the event of fire, the intumescent Ventilated Fire Barriers quickly expand to seal off the cavity to prevent fire spread.