Thermo-Loc FRSTOP Fire-Rated Cavity Stop Sock for Timber Frame

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

Boxed in smaller quantities for convenience.

Product Information

Thermo-Loc FRSTOP Fire-Rated Cavity Stop Sock for Timber Frame

Product codeTo suit cavity widthDimensionsFire integrityLead time
TIMFRSTOP5050mm65 x 65 x 1200mm1 hour3 - 5 working days
TIMFRSTOP7575mm85 x 85 x 1200mm1 hour3 - 5 working days
TIMFRSTOP8585mm100 x 85 x 1200mm1 hour3 - 5 working days
TIMFRSTOP9090mm100 x 85 x 1200mm1 hour3 - 5 working days
TIMFRSTOP100100mm110 x 110 x 1200mm1 hour3 - 5 working days
TIMFRSTOP115115mm130 x 100 x 1200mm1 hour3 - 5 working days
TIMFRSTOP125125mm140 x 100 x 1200mm1 hour3 - 5 working days
TIMFRSTOP150150mm160 x 120 x 1200mm1 hour3 - 5 working days

NB. Non standard cavity sizes up to 300mm are available to special order

  • 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
  • Polythene encapsulated cavity stop sock
  • Available in standard widths of 50, 75, 100, 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
  • Flanged stopsock for timber frame applications
  • Boxed in smaller quantities for convenience
  • Satisfies all NHBC requirements
  • Complies with all relevant Building Regulations
  • Meets all relevant British Standards
  • Manufactured using Rockfibre mineral wool
  • Rockfibre uses no CFC’s, HCFC’s in the manufacturing process
  • Thermal conductivity of Rockfibre insulation 0.037w/mK
  • To calculate quantities divide the overall length of the required cavity wall run by 1.2m, allow an additional unit for each corner for cutting. Always round up to the next whole number
  • Determine and stipulate the cavity width that the FRstop needs to suit
  • NB. Fire integrity performance is for FRstop only. Timloc Building
    Products advise performance criteria is agreed with timber frame
  • FRstop must be compressed and friction fit with timber frame and fixed through flange. For vertical applications both flanges are fixed to timber frame. For horizontal applications only the top flange should be fixed. Fix flanges using clout nails at 150mm centres.
  • The plastic coating only offers weather resistance and offers no application performance. Any joints should be tightly butted together with no gaps. The stop sock must fill the whole cavity width and cavity insulation worked around.

F30 Accessories/sundry items for brick/block/stone walling
• Manufacturer: Timloc Building Products, Timloc House, Ozone Park,
Howden, East Yorks. DN14 7SD. T: 01405 765 567 W:
• Types(s) and location(s): FRstop – thermal and acoustic fire stops to be
installed vertically and horizontally as work proceeds. Position where a
party wall meets the cavity wall or at floor levels, supplied in 1.2m lengths
and butt jointed.
• Reference: TIMFRSTOP Range

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