Enhanced cavity barrier for rainscreen systems.
An advanced intumescent strip fixed to high density non-combustible ROCKWOOL insulation, SP Firestop OSCB is 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.
Designed for use only in conjunction with ROCKWOOL RAINSCREEN DUO SLAB, SP Firestop OSCB forms an open-state cavity fire barrier within a rainscreen cavity.
The product is available in three variants giving up to 120 minutes fire performance.
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.
Fully tested to ASFP TGD 19, 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.
Installed horizontally and designed to ensure an appropriate open air space is maintained, SP Firestop OSCB is suitable for cavity widths up to 425mm (OSCB 60, OSCB 120 LITE) and 600mm (OSCB 120).
Fully tested to “ASFP Technical Guidance Document 19: Fire resistance Test for ‘open-state’ cavity barriers used in the external envelope or fabric of buildings”
Up to 120 minutes fire integrity and insulation
Provides 25mm or 44mm airspace
Satisfies NHBC and CWCT guidance for ventilation gaps at fire barrier locations
Easy site storage and handling
Fire resistance - - 60 - 120 minutes