Polythene enclosed Mineral Wool Fire Barrier for Rainscreen Systems - allowing ventilation and drainage of the
cavity under service conditionsVRB Plus
Features
- Continuous free airspace of 40mm+
- Exceeds the 38mm requirement detailed by the CWCT (Centre for Window & Cladding Technology)
- Tested & assessed by Chiltern International Fire to the basic principles of BS476 part 20*
- 60 minute fire rating for ventilated cavities ranging from 60mm up to 300mm
- Quick and cost effective installation
- Suitable for both horizontal & vertical installation
- Weather resistant construction
- Supplied in one meter lengths complete with fixing brackets
VRB Lite
Features
- Continuous free airspace of 25mm
- Achieves minimum requirements as specified by the NHBC
- Tested by Chiltern International Fire to the general principles of BS EN 1363-1
- 60 minute fire rating for ventilated cavities ranging from 25mm up to 300mm
- Quick and cost effective installation
- Suitable for both horizontal and vertical installation
- Weather resistant construction
- Supplied in one meter lengths complete with fixing brackets and pigtail screws
Installation
This product is supplied with two galvanised steel fixing brackets per metre. The brackets should be securely mechanically fixed to the internal wall at maximum 500mm centres using non combustible fixings.
The Ventilated Rainscreen Barrier should be impaled mid barrier depth by the fixing brackets, with the brackets penetrating the barrier to approximately three quarters of the width of the product.
For cut lengths a minimum of two fixing brackets should be used. It is important to ensure that the barrier is pushed back to be fully in contact with the supporting wall. Imperfections of up to 10mm can be filled with suitable intumescent mastic. Adjacent lengths should be tightly butt jointed together.
VRB Lite is installed using the same technique as above, but will require the additional installation of four x 65mm pigtail screws impaled though the outer facing side of the product at 250mm centres.
Care should be taken to ensure that the pigtail screws protrude by a maximum of 25mm, making contact with the rear of the rainscreen cladding, to ensure that the open airspace is maintained.
Associated Products
AIM Wall Cavity Barrier, with optional polythene sleeve for weather resistance may be used as a vertical barrier where applicable.
