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Cavity Closers

A range of preformed Cavity Closers that provide an accurate window aperture template during construction; insulate the cavity; and ensure efficient window installation.

To ensure windows function correctly it’s essential that the window aperture is accurately formed. Time spent preparing this opening at the outset ensures problem free window performance - enhancing a dwelling’s air tightness and avoiding unnecessary rectification or delays in the future.

Our 3 sided, welded or mechanically jointed, braced cavity closer ensures that the brick layer produces a correctly sized and square aperture every time. Each closer is marked with plot and window references. This minimises the likelihood of the incorrect closer being used in the wrong location - a potential cause of costly delays and follow on trade disruption.

The closer is constructed using recycled material but to the same specification as the window. Compliant with all current regulatory insulation requirements, the closer can be delivered on a quick turnaround (dependent on order day) and is delivered complete with all the appropriate brick ties ensuring timely and secure installation.

The Cavity Closer is available for all cavity width dimensions ensuring regulation compliance in all situations. Closers are also available in P and T Shapes, purpose made sizes and shapes and standard or check reveal applications.

Cavity Closer is are usually sourced as a 'supply only' product 6-8 weeks prior to the window supply and installation service.

Ask about our 35mm set back label to ensure correct window location for optimum thermal efficiency.


Standard specification:

  • Recycled profile extrusion
  • Acts as brickwork former
  • Closes 75, 90, 100, 115, 125 and 150mm cavities with flat, 33mm inset or check reveal (other cavity widths available upon application)
  • Eliminates moisture penetration around reveals
  • Prevents thermal bridging in accordance with Part L regulations
  • Assists Building Regulation compliance for air tightness
  • BBA approved (04/4902)
  • Achieves thermal resistance path (0.45m2/KW).


Cavity Closers and Bay templates

Bay templates

Bay templates, made to face brickwork dimensions, are available on request to allow consistent bay dimensions to be achieved.