ARC
ARC Cavity Stop Sock 125mm
£7.08 (ex VAT)
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The ARC Cavity Stop Sock 125mm (CSS125) is a passive fire protection cavity barrier designed to restrict the spread of fire within external masonry wall cavities. This version is specified for external cavities up to 125mm wide and is supplied in 1.2m lengths.
Key Features
For cavities up to 125mm
Designed for external masonry cavities with a maximum width of 125mm.
Rockfibre mineral wool
Made using rockfibre mineral wool with an A1 fire classification stated in ARC's product information.
Compression fit
The product information specifies a 10mm compression requirement and installation as brickwork or blockwork progresses.
Horizontal or vertical use
ARC states that the product can be installed horizontally or vertically at the relevant party wall detail.
Product Specifications
| Manufacturer | ARC Building Solutions |
|---|---|
| Product code | CSS125 |
| Maximum external cavity width | 125mm |
| Dimensions listed | 135 × 120 × 1200mm |
| Length supplied | 1.2m |
| Compression requirement | 10mm, as stated in ARC product information |
| Insulation material | Rockfibre mineral wool |
| Thermal conductivity | 0.037 W/mK |
| Fire integrity | 4 hours masonry fire integrity, as stated in ARC's data sheet* |
| Insulation performance | 15 minutes, as stated in ARC's data sheet* |
| Fire classification | Euroclass A1, as stated in ARC product information |
| Certification | ARC product information references IFC certificates IFCC 1727 and IFCC 1728 |
| Wade selling unit | Sold individually |
*Fire performance applies to the relevant tested construction and installation. Check the latest ARC technical documentation and certificate scope for the project-specific application.
Typical Applications
The ARC Cavity Stop Sock is designed for use within external masonry wall cavities. ARC identifies applications including cavity barriers around openings, at separating wall or floor junctions, and at eaves level, subject to the relevant construction detail and certification.
Installation and Technical Information
ARC's product information describes the Cavity Stop Sock as a compression-fit product installed as brickwork or blockwork progresses, with no mechanical fixing required for the stated application. Correct fit and continuity are important; installation must follow the manufacturer's instructions and the relevant tested construction.
Manufacturer Information
Frequently Asked Questions
What cavity width is the CSS125 designed for?
It is designed for a maximum external cavity width of 125mm. Check the actual cavity and required compression fit before ordering.
What fire performance does it have?
ARC's product datasheet states 4 hours masonry fire integrity and 15 minutes insulation performance for CSS125. Confirm the relevant certified construction before specification.
Does the Cavity Stop Sock need mechanical fixing?
ARC's product information describes a compression-fit installation and states that mechanical fixing is not required for the specified application. Follow the current installation instructions.
Should the polythene sleeve be removed?
ARC states that the sleeve should remain in place during installation. It provides product identification and protection from the elements; it does not add to the product's stated performance.
Need Help Selecting a Cavity Stop Sock?
Contact Wade Building Supplies if you need help checking cavity sizing or selecting the right product for your wall construction.
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