25th January 2022
ARC OSCB is an open state cavity barrier for ventilated cavities.
ARC OSCB is designed for installation within cavities where ventilation is required in service use. Manufactured from non-combustible rockfibre mineral wool with a reactive intumescent layer, the cavity barrier can provide an air gap of up to either 25mm or 44mm.
The intumescent layer will rapidly expand when exposed to heat in a fire event, closing off the air gap and preventing vertical fire spread within the external cavity.
Suitable for installation horizontally, ARC OSCB should be partnered with ARC Fire Stop Slab installed vertically for a complete cavity fire barrier solution.