Polythene sleeved mineral wool and intumescent fire barrier for rainscreen systems. Allows ventilation and drainage of the cavity under service conditions, whilst providing up to 120 minutes fire resistance performance.

Features and benefits:

  • Offers an effective fire barrier for ventilated voids up to 300 mm wide.
  • Allows an open continuous ventilated airspace of 25 mm.
  • Polythene sleeved to give weather resistance in a semi-exposed application.
  • Quick to install.
  • Supplied with two galvanized steel fixing brackets in 1 m lengths, and 'pigtail' screws.
  • Suitable for horizontal and vertical installation.
  • Tested to BS EN 1363-1, achieving a fire resistance performance of 120 minutes integrity and 60 minutes insulation.

The brackets should be securely mechanically fixed to the internal wall at maximum 500 mm centres using non-combustible fixings.

VRB 120 requires the additional installation of four x 75 mm long course wound 'pigtail' screws impaled though the outer intumescent facing side of the product at 250 mm centres. The pigtail screws should protrude by a maximum of 25 mm, making contact with the rear of the rainscreen cladding, to ensure that an open continuous ventilated airspace is maintained. Consult manufacturer's literature for further installation information.

General information

Uniclass 2015

Pr_25_80_81_51 Mineral wool fire-stoppingPrimary


P12/360 Mineral wool rigid batts

P12/40 Mineral wool rigid batts

Specification data - Mineral wool fire-stopping

Product Reference




AIM Polythene sleeved wall cavity barrier

For vertical compartmentalisation.

Standard product features


1000 mm.


Total cavity size less 25 mm.


75 mm.

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