Thermo-loc Platinum+ FX Cavity Closer

Cavity closers designed to eliminate damp and cold bridging around doors, windows, and sills.

Suitable for between 50mm-150mm cavity sizes. Single profile for 50mm-100mm cavities, double profile for 105mm-150mm cavities, Multi and Check Reveal Multi options also available. 25mm insulation thickness.

Compliant with Building Regulation Approved Documents C, L1 and L2 and satisfies BRE document ‘Thermal Insulation: avoiding risks’.

Fixing ties available in packs of 100.


  • 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
  • Suitable for cavities up to 150mm

Add this product to your specification on NBS or SpecifiedBy

Product Information

Thermo-loc Platinum + FX

DescriptionCavity WidthLengthPack QuantityLead TimeProduct Code
Thermo-loc Platinum + FX50mm2.4m10Next Working DayFX2.4/50
Thermo-loc Platinum + FX75mm2.4m10Next Working DayFX2.4/75
Thermo-loc Platinum + FX90mm2.4m10Next Working DayFX2.4/90
Thermo-loc Platinum + FX100mm2.4m10Next Working DayFX2.4/100
Thermo-loc Platinum + FX120mm2.4m107-10 Working DaysFX2.4/120
Thermo-loc Platinum + FX125mm2.4m10Next Working DayFX2.4/125
Thermo-loc Platinum + FX130mm2.4m107-10 Working DaysFX2.4/130
Thermo-loc Platinum + FX150mm2.4m10Next Working DayFX2.4/150
Thermo-loc Platinum + FX Multi50-100mm2.4m10Next Working DayFX2.4/100MULTI
Thermo-loc Platinum + FX CR50mm2.4m107-10 Working DaysFX2.4/CR50
Thermo-loc Platinum + FX CR100mm2.4m107-10 Working DaysFX2.4/CR100
Thermo-loc Platinum + FX CR125mm2.4m107-10 Working DaysFX2.4/CR125
Thermo-loc Platinum + FX CR150mm2.4m107-10 Working DaysFX2.4/CR150
Thermo-loc Platinum + FX CR Multi50-100mm2.4m107-10 Working DaysFX2.4/CR100MULTI
Fixing Ties - 100 Pack--100Next Working DayCCFIX

  • Provides an effective DPC and thermal barrier between frame, inner and outer wall leaf
  • Thermal conductivity of 0.031W/mk
  • Exceeds the minimum thermal resistance path of 0.45m2 K/W stipulated in accredited construction details
  • Rigid profile extrusion allows first and second fix
  • Durable and resistant to decay
  • Simple on-site trimming to cope with ‘rogue’ cavity widths
  • Global warming potential of less than 5
  • Ozone depletion potential of zero
  • Available fully rebated – Check reveal (single flange)
  • Manufactured to BS EN ISO 9001 and BS EN ISO 14001
  • Complies with Building Regulation Approved Documents C, L1 & L2
  • Satisfies BRE document ‘Thermal insulation: avoiding risks’
  • Meets all relevant British Standards
  • Satisfies NHBC standards
  • Rigid profile extruded in UPVC. Platinum expanded Polystyrene insulation 0.031W/mk. Multi 100mm, Multi 100mm CR and fixed cavities.
  • 2.4m lengths.
  • The accredited construction detail published by DCLG requires a minimum overlap of 30mm between the window frame and cavity closer.
  • Cut the cavity closer into the required lengths allowing the jamb section to overlap the sill section by cutting away parts of the fixing flange and to butt the underside of the lintel.
  • For second fix applications, the cavity closer 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, or alternatively the insulation can be trimmed to fit using a sharp knife.
  • Fixing nails to the flanges are recommended to ensure a secure fit.
  • Cavity insulation should butt tightly to the cavity closer.
  • Establish the cavity width and select the correct cavity closer width to ensure the cavity can be closed.
  • In jamb and sill applications, first estimate the total length of cavity closer required, then order the correct number of individual 2.4 metre lengths so no joint pieces.

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

To extend not less than 150mm beyond ends of lintels/bridgings.
Manufacturer: Timloc Building Products, Ozone Park, Howden, East Yorks. DN14 7SD. T: 01405 765 567 W:
Reference: eg.FX2.4/50 (Thermo-loc Platinum+ FX, Expanded Polystyrene, 2.4m, 50mm)

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