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FRstop 1-hour fire-rated cavity stop sock. Designed to restrict the spread of flames within external masonry and to further minimize the effect of flanking noise pollution at wall junctions.

Key Features

• FRstop cavity stop socks are lengths of low resin, non-combustible, rockfibre mineral wool sleeved in 35 micron polythene for on-site
• weather protection
• 1 hour fire integrity and minimum 15 minute insulation
• Independently tested by Warrington Fire
• Polythene encapsulated cavity stop sock
• Available in standard widths of 50, 75, 85, 90, 100, 115, 125 and 150mm
• Special cavity widths are available on request up to 300mm
• Meets the requirements of the Robust Detail, Approved Document B and NHBC Standards
• Boxed in smaller quantities for convenience