Cavity Closers

Improve thermal performance and achieve a cleaner finish around openings with our range of Cavity Closers. Designed for use in cavity wall construction, cavity closers help seal the gap around doors and windows, reducing cold bridging and improving insulation at one of the most important junctions in a build. Whether you’re working on a new build, extension or refurbishment, cavity closers support better energy efficiency and a more professional finish around frames.

Cavity closers are commonly used around window reveals, door openings and structural openings, helping close cavities neatly while supporting weather resistance and reducing drafts. They also help provide a fixing point and tidy edge for internal plastering and external finishes, making installation smoother and improving overall build quality. By reducing heat loss and improving airtightness, cavity closers contribute to a more comfortable internal environment and can help support compliance with modern building performance expectations.

For best results, choose cavity closers that match your cavity width, install them accurately around the opening, and ensure a continuous seal to prevent gaps. Using compatible membranes and sealing materials can also help improve airtightness and moisture protection.

Shop online today for cavity closers with delivery and collection available.