Application

Enhanced cavity barrier for rainscreen systems.

Description

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 & 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 range of sizes 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.

Application:

Enhanced cavity barrier for rainscreen systems.

General information

Size

90 mm

Uniclass 2015

Pr_25_80_80_42 Intumescent coated foil mesh flexible cavity barriersPrimary

CAWS

F30/180 Cavity closers

F30/18 Cavity closers

P10/75 Wired small cavity barriers

P10/70 Sleeved small cavity barriers

P10/420 Sleeved mineral wool small cavity barriers

Specification data - Intumescent coated foil mesh flexible cavity barriers

Product Reference

ROCKWOOL SP Firestop OSCB 25

ROCKWOOL SP Firestop OSCB 44

Fire performance

ROCKWOOL® SP Firestop OSCB 25 & 44 can achieve up to EI 120

Overall cavity width

See 'Options below and insert requirement.

Accessories

None

Fixing brackets

Maximum 500 mm centres.

Pig tail screws

Maximum 333 mm centres.

Standard product features

Features:

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

Size:

90 mm.

Length:

1000 mm.

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