The 150mm Cav Frstop 1hrfr Cavity Stop Sock 1200mm is a high-quality fire-rated solution designed to provide essential protection within cavity walls. Engineered to deliver 1 hour of fire integrity and a minimum of 15 minutes of insulation, this cavity stop sock effectively restricts the spread of flames through external masonry, ensuring enhanced safety on any construction project.

Manufactured from low resin, non-combustible rock-fibre mineral wool, the product is sleeved in durable 35-micron polythene for reliable on-site weather protection. Measuring 150mm in width and 1200mm in length, it is tailored to fit standard cavity dimensions and complies fully with building regulations, meeting all relevant British Standards.

Beyond fire protection, the cavity stop sock also helps to minimise flanking noise pollution at wall junctions, making it a smart choice for projects requiring enhanced acoustic performance as well as safety.

As South London’s largest independent builders merchant, we provide easy access to this essential product both online and in-store. Our customers can order with confidence, benefiting from quick same and next-day delivery options depending on location, or visit one of our branches to browse the full range in person.

Whether you are a contractor working on a large-scale development or a tradesperson managing smaller refurbishments, the 150mm Cav Frstop 1hrfr Cavity Stop Sock 1200mm is a reliable component to help meet fire safety standards without compromise.