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
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