The full width barrier prevents the passage of flame and smoke within the cavity it fills for a range of fire rating periods
An intumescent strip fixed to high density non-combustible insulation, OSCB's are designed to form an open-state cavity barrier within a rainscreen system. This allows ventilation and drainage under normal service conditions, while in the event of a fire the intumescent strip quickly expands outwards to seal the cavity, preventing the passage of fire and smoke.
Intumescent or Ventilated Cavity Fire Barriers are designed to reinstate fire resistance performance within external wall cavities that require permanent (open-state) ventilation in non-fire conditions.