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The indispensable building component – 100% post-consumer recycled UPVC cavity closers

Cavity closers have become a critical building component that’s now widely used in all commercial and residential new-build projects. They are undoubtedly the simplest and most effective way to seal cavities around wall openings and provide a rigid template for bricklaying and window or door installation.

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Select from:

Cavalok BigBlok
BigBlok Super-insulating Cavity Closers for 125-300mm cavities Learn more
Cavalok FlameBlok
FlameBlok Environmentally friendly cavity closer with exceptional fire protection. Learn more
Cavalok Trade Closer
Trade Closer Retro-fit solution for existing walls or pre-determined new-builds. Learn more
Window Board Receptor
Window Board Receptor Add those final internal finishing touches to your windows. Learn more

Cavalok Structural Closer
Structural Closer Works across Passive House Design and CSH requirements. Learn more
Cavalok Window Strap
Window Strap Strong, adjustable steel fixing strap for standard and extra wide reveals. Learn more
Cavalok HeadVent
HeadVent Unobtrusive and eliminating need for unsightly through-frame ventilation. Learn more
Cavalok Compactfoam
Compactfoam Lightweight, heat and pressure resistant super-strength technology. Learn more
Improving thermal efficiency performance

Our unrivalled range of innovative cavity closers won’t just help you meet today’s sustainable legislation, but that of the future.

One of the main Cavalok products is BigBlok. A leading insulated cavity closer system designed for zero-carbon buildings, which means it already satisfies the 2016 Code for Sustainable Homes Level 6.

Benefits at a glance:
  • Manufactured from 100% post-consumer UPVC
  • Pre-installed polystyrene core enhances thermal efficiency for Part L compliance
  • Time saving clip together assembly – no adhesives or tools required Quick-fit spring clip for fast installation of pre-glazed windows
  • Compatible with most UPVC window systems as well as timber and aluminium
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