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Thermo-loc FR60

60-minute fire-rated cavity closer.

Fire rated barriers for eliminating damp and cold bridging around doors, windows and sills.

Use cases:

  • To close the cavity at external doors, window jambs and sills
  • To provide thermal insulation and prevent ‘cold bridging’
  • To provide a DPC at external doors, window jambs or sills
  • 60 minutes fire rating and minimum 15 minutes insulation
  • Suitable for cavities up to 150mm
  • Suitable for timber and masonry walls

For more information call 01405 765567 Free next day delivery *

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Features & Benefits

  • Provides an effective DPC and thermal barrier between frame, inner and outer wall leaf
  • Thermal conductivity of 0.036W/mK
  • Exceeds the minimum thermal resistance path of 0.45m2K/W stipulated in ‘Part L’ accredited construction details
  • Rigid profile extrusion allows both first and second fix
  • Suitable for all frame and sill positions (see Fig.1)
  • Durable and resistant to decay
  • Insulation option to suit your requirements both thermal and fire rated
  • Global warming potential of zero
  • Ozone depletion potential of zero
  • Available fully rebated - Check reveal (single flange)


Technical Information


  • Independently tested by Warrington Fire
  • LABC Registered Detail
  • Satisfies NHBC Standards
  • Manufactured to BS EN ISO 9001 and BS EN ISO 14001
  • Complies with Building Regulation Approved Documents C, B, L1 & L2
  • Complies with ‘Part L’ accredited construction details
  • Complies with the Scottish Building Standards ‘Technical handbook’
  • Satisfies BRE document ‘Thermal insulation: avoiding risks’
  • Meets all relevant British Standards

Material and colour choice

  • Rigid profile extruded in white UPVC
  • Supplied in 2.4 metre lengths
  • Standard cavity options available 50mm - 150mm
  • Rockfibre mineral wool (FR) insulation 0.036W/mk

Installation advice

  • Can be used in both first and second fix applications
  • Cut the cavity closer into required lengths allowing the jamb section to overlap the sill section and to butt the underside of the lintel
  • In first fix application the cavity barrier should be nailed to the jamb/sill of the door or window frame and the whole assembly built in as work proceeds. Alternatively the barrier can be built in sections using fixing ties as work proceeds.
  • For second fix applications, the cavity barrier is pushed into the open cavity after building work is complete. The compressible nature of the exposed insulation material is used to create a friction fit in the cavity, secure nail fixing is required.
  • Joining ‘off cut’ sections should not be carried out for the FR range

How to order

  • Establish the cavity width and select the correct cavity barrier width, or the next size up to ensure the cavity can be closed
  • In jamb and sill applications, first estimate the total length of cavity barrier required, then order the correct number of individual 2.4 metre lengths so limiting joint pieces
  • Fixing ties are available for secure fixing if required (particular attention around door openings). Allow for ties fitted at 450mm centres

Technical considerations

  • BRE Document ‘Thermal insulation: avoiding risks’ and Robust Details stipulate: “When a window or door frame is set back behind the inner face of a dense outer masonry leaf, it should overlap an insulated closer by a minimum of 30mm for BRE exposure zones Sheltered to Severe; but fully rebated (check reveals for zones Very Severe’’ (see Fig.2)
  • With reference to insulation, the products in this range do not use, contain or produce Urea Formaldehyde, CFC’s or indeed any of the so called soft CFC’s, ie. HCFC’s & HFA’s. They conform to the Montreal Protocol and have an ozone depletion potential of zero and global warming potential of zero.

Bill of quantity

F30 Accessories/sundry items for brick/block/stone walling


  • To extend not less than 150mm beyond ends of lintels/bridgings.
  • Manufacturer: Timloc Building Products, Timloc House, Ozone Park, Howden, East Yorks. DN14 7SD. T: 01405 765 567, W:
  • Reference:… FR60/50 (Thermo-loc FR60, 2.4m, 50mm cavity)
  • Accessories: Fixing ties available, 6 No. per 2.4m cavity barrier.
  • nbs plus
  • riba

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