30 DAY


Size: 50mm Cavity - Red - 65 x 65 x 1200mm (pack 40)
Our Price
£72.37 inc VAT

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ARC Cavity Stop Sock restricts the spread of smoke and flames within external masonry walls, as well as minimising the effect of flanking noise pollution at wall junctions

  • Masonry fire rating - up to 4 hours (check out data sheet for actual depending on size required)
  • Cavity widths 50 - 300mm
  • Specified in terraced semi-detached, apartments and major projects
  • Complies to Robust Detail Part E and Building Regulations
  • Can be manufactured to suit cavity widths up to 300mm
  • Easily installed with compression fit; no mechanical fix is required
  • Made To Order

They are manufactured from low resin, non-combustible rockfibre mineral wool insulation and are sleeved in polythene for on-site protection.


Length supplied 1.2m
Third-party certifcation Certifire CF5403
Insulation Non-combustible rockfibre mineral wool
Thermal conductivity 0.037W/mK
Fire rating Up to 4 hours
Insulation performance Minimum 15 minutes
Test standard BS 476 Part 20
Construction type Masonry
Orientation Vertical or horizontal
Robust detail performance E-WM 1-21

    Please click on the links below:

    ARC Cavity Stop Sock Datasheet

    ARC Cavity Stop Sock is designed to be compression fitted within a masonry cavity as the brick and block work progresses, no mechanical fixing is required.

     Care should be taken butt joints are tightly fitted with no gaps remaining. The barrier must fully fill the cavity from brick to block, with any cavity insulation cut back. 

    The polythene encapsulation offers on-site weather protection, but can be cut away without affecting the barrier’s performance

    Installation Video

    ARC’s wealth of technical experience ensures that the best solution can be identified from their comprehensive range of products. All fire barriers and cavity closers are manufactured to NHBC requirements and hold LABC accreditation. Operating within an ISO 9001 Quality Management System and ISO 14001 Environmental Management System, all products are manufactured to the highest standards.

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