Mineral Wool Rainscreen Barrier | Ventilated Cavity Fire Barrier

Rainscreen Barrier | QVB

Cavity fire barrier for rainscreen cladding applications. Maintaining a ventilated cavity.

Features & Benefits

  • Up to 2 hours fire rating
  • Tested in accordance with BS EN 1363-1: 1999
  • Provides a 25mm airspace behind rainscreen cladding
  • Foil faced to provide a smoke barrier
  • Available to suit cavity widths from 75mm to 300mm


QVB Rainscreen Barrier has been fire tested at Chiltern International Fire, achieving up to two hours fire integrity when fitted between blockwork and rainscreen cladding. Tests were carried out in accordance with BS EN 1363-1:1999.

Name: Rainscreen Barrier


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QVB Rainscreen Barrier is manufactured using rockfibre mineral wool which achieves a fire classification of Euroclass A1 as defined in BS EN 13501-1, and conforms to BS EN 13162 and EN16001 Energy Management Systems. Quelfire’s rockfibre mineral wool insulation has a thermal conductivity of 0.035W/mK. QVB Rainscreen Barriers are supplied in polythene packs which are designed for transporting and protecting the products.

It is not recommended that the packs are stored in direct sunlight. When storing the barriers for longer periods of time it is recommended that the product should be stored indoors, or under cover.

No CFCs or HCFCs are involved in the manufacturing process of Quelfire’s rockfibre mineral wool insulation. The material presents no known threat to the environment and is classed as ODP and GWP zero. Quelfire’s Rainscreen Barrier has a Green Guide rating of A+.


QVB Rainscreen Barrier is expected to last the lifetime of the building.

Technical Support & Guidance

Should you require any further information regarding this product, please don’t hesitate to contact one of our specialists.

Application / installation

QVB Rainscreen Barrier has been designed to provide a two hour fire rating where continuous vertical airflow is required behind a rainscreen cladding system.

The Quelfire Fixing Spike is fitted to the external surface of the inner blockwork, onto which the QVB Rainscreen Barrier is then impaled. A Quelfire Spacer Spike is fitted to the external surface of the Rainscreen Barrier below the intumescent strip. The Spacer Spike ensures the 25mm airspace is maintained along the length of the fire break.

QVB Rainscreen Barrier can be used in conjunction with QFS Fire Stop Slab vertically. Vertical barriers fully fill the cavity while horizontal Rainscreen Barriers provide a fixed 25mm airspace. The provided Quelfire Spacer Spikes ensure the correct airspace is maintained during fitting.

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Product Code Suitable for Cavity Width Dimensions Fire Rating
QVB75 75mm 50 x 100 x 1200mm 2 hours
QVB85 85mm 60 x 100 x 1200mm 2 hours
QVB100 100mm 75 x 100 x 1200mm 2 hours
QVB125 125mm 100 x 100 x 1200mm 2 hours
QVB150 150mm 125 x 100 x 1200mm 2 hours
QVB175 175mm 150 x 100 x 1200mm 2 hours
QVB200 200mm 175 x 100 x 1200mm 2 hours
QVB225 225mm 200 x 100 x 1200mm 2 hours
QVB250 250mm 225 x 100 x 1200mm 2 hours
QVB275 275mm 250 x 100 x 1200mm 2 hours
QVB300 300mm 275 x 100 x 1200mm 2 hours

Can’t find the size you require? QVB Rainscreen Barrier can be manufactured to suit any cavity width between 75 and 300mm. Contact us for more information.

QVB Rainscreen Barrier - Technical Documentation

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