Single Flange Thermal Cavity Closer (G242)

The G240 cavity closer suits standard vertical cavity and sill details providing a thermal break to the cavity and an effective vertical DPC barrier.

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. 

The lightweight closers are available in sizes to suit all cavity widths and are simply installed, requiring no special tools. Lengths can be simply cut with a saw, with no loss of thermal efficiency, and with some specific products, PVC flanges provide a secure method of fixing. 

The closer can be used in individual lengths, or some may be preformed into frames or fixed directly on to window and Door Frames. 

G245 and G246 Plastic Fixing Clips enable the closer to be mortared securely to the brickwork. They also allow shorter lengths of closer to be joined together, thus reducing wastage. 

The Manthorpe G240 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 a part of a detail to satisfy the requirements of a cavity barrier as described in Part B of the building regulations. 

The cavity closer is non-load bearing and should not be used as replacement for traditional methods of fixing window and door frames to the masonry.