ARC Cavity Stop Socks restrict the spread of smoke and flames within the cavity of external masonry walls. It is ideally suited for providing a cavity barrier within the external wall cavity, in line with a separating wall or floor as specified in Approved Document B, and for closing the cavity at eaves level.

Manufactured using rockfibre mineral wool that has a thermal conductivity of 0.037W/mK and 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.

ARC Cavity Stop Socks have been fire tested in accordance with the principles given in EN1366-4, achieving up to four hours fire integrity within a masonry construction.

This stop sock has dimensions of 160 x 120 x 1200mm to suit a 150mm (6inch) cavity and is light blue in colour for easy identification.

FEATURES AND BENEFITS

• Up to 4 hours fire integrity
• Suitable for horizontal or vertical use
• Easy to install – no mechanical fixings required
• 1.2m lengths

INSTALLATION

ARC Cavity Stop Socks are designed to be simply compression fitted as the brick and block work progresses. No mechanical fixing is required, with the compression fit holding the barrier in place. The barrier must fully fill the cavity from external brick to internal block. Any cavity insulation must be cut back at the location of the barrier, and care must be taken to ensure that the built cavity width is accurate and that the size of stop sock fitted is appropriate.

Prior to installation, the cavity must be clear of all debris

» Vertical application: recommend building up the internal block work first. Then progress several courses of brickwork, before installing the barrier. The brickwork can continue, building the barrier in. Care must be taken to ensure the correct compression fit is achieved.

» Horizontal application: build the brickwork up to the level the barrier will be installed, ensuring the width of the cavity is correct. Allow the brickwork to set, before push fitting the barrier in to place and under the correct compression.

» At the end of a run or at a corner, lengths of barrier should be cut to the required length, and then tightly butt jointed ensuring no gaps remain. DO NOT bend the stop sock around corners!

Please note that the polythene encapsulation/wrapping does not contribute to the performance of the barrier, but offers weather protection and product identification. We recommend that it is left in place for these purposes however, if it becomes torn or damaged there is no cause for concern.