ARC
ARC Cavity Stop Sock 150mm
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ARC Cavity Stop Sock 150mm
The ARC Cavity Stop Sock 150mm is a passive fire protection product designed to restrict the spread of smoke and flames within external masonry wall cavities. The 150mm version is designed for a maximum external cavity width of 150mm and is third-party certificated.
Key Features
Dimensions & Specification
| Manufacturer | ARC Building Solutions |
| Product Code | CSS150 |
| Maximum External Cavity Width | Up to 150mm |
| Dimensions | 160 × 120 × 1200mm |
| Compression Required | 10mm |
| Insulation | Rockfibre mineral wool |
| Thermal Conductivity | 0.037 W/mK |
| Length Supplied | 1.2m |
| Wade Selling Unit | Sold individually |
Where to Fit
The ARC Cavity Stop Sock is designed for use within external masonry wall cavities. It is suited to providing a cavity barrier within the external wall cavity in line with a separating wall or floor and for closing the cavity at eaves level. It can also be installed horizontally or vertically at the party wall detail.
The 150mm version is designed for a maximum external cavity width of 150mm. The barrier should fully fill the cavity and the correct size should be selected to achieve the required compression fit.
Technical Information
ARC Cavity Stop Sock is manufactured using rockfibre mineral wool achieving Euroclass A1 fire classification. ARC states a thermal conductivity of 0.037 W/mK. The polythene encapsulation provides weather protection and product identification and should be left in place.
The CSS150 requires 10mm compression and has a stated masonry fire integrity of 4 hours with 15 minutes insulation performance.
View ARC Cavity Stop Sock Datasheet →Related Products
Need Help Selecting the Right Cavity Stop Sock?
Wade's team can help with cavity sizing, fire-stopping requirements and product selection.
Frequently Asked Questions
What cavity size is the CSS150 designed for?
CSS150 is designed for a maximum external cavity width of up to 150mm.
What fire performance does it have?
ARC's data sheet states 4 hours masonry fire integrity and 15 minutes insulation performance for CSS150.
How is the Cavity Stop Sock installed?
It is designed to be compression fitted as brick and blockwork progresses. No mechanical fixing is required.
Should the polythene sleeve be removed?
No. ARC states that the sleeve should be left in place for product identification and protection from the elements.
Can it be installed horizontally or vertically?
Yes. ARC states that the Cavity Stop Sock can be installed horizontally or vertically at the party wall detail.
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