Rainscreen OSCB forms an open-state cavity fire barrier within a rainscreen cavity. The combination of non-combustible insulation with an effective intumescent supports the construction of safe façade systems and aids the design of high-rise buildings over 18m in height. The product is available in two variants giving up to 60 and 120 minutes fire performance respectively. Each comprises of a continuous intumescent strip fixed to the leading edge of a foil faced stone wool barrier, encapsulated by a weather-resistant polythene sleeve – coloured white for OSCB 60 and red for OSCB 120.