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ROCKWOOL® SP FireStop OSCB 25 & 44
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Application

For use within ventilated facade 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 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.

General information

Material

Stone wool

Size

90 x 1000 mm

Thickness x length.

Uniclass

Pr_25_80_80_79 Sleeved mineral wool 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 - Sleeved mineral wool cavity barriers Enhanced data

General requirements

Insulation products generally.

Cavity barriers

-

Attachment

Not required.

Fixing brackets

Maximum 500 mm centres.

Pig tail screws.

Maximum 333 mm centres.

Size

Length.

1000 mm.

Fire performance

Not applicable.

Up to EI 120.

Product Reference

ROCKWOOL SP Firestop OSCB 25

ROCKWOOL SP Firestop OSCB 44

Overall cavity width

Insert requirements, maximum total cavity width: 600 mm.

Provides 25 mm airspace.

Thickness

90 mm.

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