Rigid frame-forming cavity closers from Cavalok are essential components for every new-build development


One component – multiple benefits

PVC-U cavity closers are the simplest, most effective way to seal cavities around wall openings and provide a rigid window or door frame acceptor. As well as creating a rigid template for bricklaying and window or door installation, they enhance thermal efficiency, create a damp-proof course and prevent cold bridging.

Easy-to-install cavity closers
The simple clip-together system from Cavalok requires no tools, screws or adhesives, assuring you of consistent performance every time. PVC-U cavity closures eliminate the time-consuming process of fitting timber dummy formers.

Built-in thermal efficiency
Cavalok cavity closers incorporate a pre-installed polystyrene insulation core, which not only improves thermal efficiency for Part L Building Regulations compliance, but also saves time on site because no additional insulation needs to be fitted.

Prevent cold-bridging, condensation and mould
Using rigid PVC-U cavity closers achieves a close fit around all building apertures to prevent draughts. It creates an effective damp-proof barrier and prevents cold-bridging, condensation and mould growth.

Eco-friendly cavity closers – made from 100% recycled material
Cavalok PVC-U cavity closers are manufactured entirely from recycled post-consumer waste. Today, with the Code for Sustainable Homes offering credits to builders who use sustainable materials and energy-efficient products, Cavalok cavity closers are the obvious choice for every new-build project.

Complete window compatibility
The Cavalok cavity closer is designed to accept most window systems, which can simply be clipped into position. Windows can be fitted from either inside or outside the building, to assist compliance with HSE guidelines on working at height.

Cavity closers for all building types
Take a look at our full product range to find the right cavity closer for your next project.

Any questions?
Contact us today for more information on the benefits of PVC-U cavity closers.

Our Recycling Process

See how we take post consumer waste and recycle it into our sustainable PVC-U Cavity Closer.

Cavalok in action

Browse our case studies to see the Cavalok range in use.