ROCKWOOL® SP FireStop OSCB 25 & 44

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.

Features and benefits:

• 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 25/ 44 mm airspace.
• Satisfies NHBC and CWCT guidance for ventilation gaps at fire barrier locations.
• Weather resistant

Overall cavity width:

Available in any size up to the maximum stated. Consult manufacturer's literature for details.

• SP Firestop OSCB 25: maximum total cavity width – 600 mm.
• SP Firestop OSCB 44: maximum total cavity with – 425 mm.