Cavity closers to control moisture build-up

Thermal cavity closers prevent heat loss at key potential weak points in the cavity construct, at door and window reveals – heat loss that is both costly and avoidable. By solving cold bridging problems, properly installed thermal cavity closers can prevent condensation build up, damp and mould growth potentially leading to expensive repair work.

Manthorpe’s cavity closers can act as effective vertical DPCs, although a dedicated DPC is recommended when used in a horizontal configuration. Furthermore, thanks to careful design and construction, they also offer maximum flexibility to configure to multiple size and dimensions requirements, including arched and round windows and doors.

Our cavity closers are entirely British manufactured, as are the majority of our products; proudly supporting British manufacturing and minimising risk in the supply chain and in your project schedules.


Cavity closers – variations for all situations

Cavity closers from Manthorpe are available in both double and single flange variations for use in standard in-line cavity wall details and rebated reveals, respectively. They are available to fit cavity widths between 50 and 150mm, although we can supply closers up to 350mm on a bespoke order basis.

Supplied in standard lengths, our cavity closers can be easily cut to fit with a saw without any loss of thermal efficiency. Similarly, shorter lengths of cavity closer can be joined.  Some cavity closers can be preformed into frames or fixed directly on to window and door frames.

Find details for your local Area Sales Manager on our Contact Us page, who will advise you of your nearest cavity closers stockist.

Alternatively, find stockists for the full Manthorpe product range through our ‘Find a stockist’ facility. Just pop in your postcode for a list of your nearest stockists and accompanying maps and directions.

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Cavity closers to control moisture build-up: 4 Results

The Manthorpe G242 Cavity Closer can be used around timber doors and windows. When tested as a whole detail including timber window/door frames and plasterboard, it can be used as part of a detail to satisfy the requirements of a cavity barrier as described in Part B of the building...

The G245 Fixing Clip enables the closer to be mortared securely to the brickwork. They also allow shorter lengths of closer to be joined together, thus reducing wastage. The clips slide into the fixing channel allowing variable height adjustment to match brick courses. Eight clips are...

The Right Angle Clips G246 provides a tight fit and form solid jointed corners which helps prevent misalignment. These clips are also used to form cavity frame formers from lengths of G240 or G242.

The G240 Cavity Closer has a double flange feature for use in standard in-line cavity wall details. It is also used in sill details by simply cutting a length to suit the width of the window and placed in the cavity at the sill. A DPC is still recommended in horizontal applications. ...


From our first foray into the building industry through to our latest product innovations, Manthorpe Building Products has grown year on year thanks to a philosophy of continuous investment and development. 

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At Manthorpe we pride ourselves on our high quality standards, not just for the products that we produce; but for our design, manufacture, sales and delivery processes as well.

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Innovation has always been at the core of the company.  From new technology investment to in-house research and development, Manthorpe is constantly looking ahead to meet the needs of the industry.

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