Add-on shell

Windows with an add-on shell

The add-on shell, made from a high-quality aluminium alloy, is clipped onto the outside of the windows and wraps around the sash and outer frame. It gives the window element a durable, weather-resistant surface, a wide choice of colours and easy maintenance. Beneath the shell lies a different core in each case: uPVC or timber.

Wall design with an add-on shell

An add-on shell is a wall cladding that is placed in front of a load-bearing masonry structure and connected to it. This may be done for aesthetic or insulation-related reasons. Common examples of add-on shells are brick facings or timber, sheet-metal or plastic cladding on external walls. Insulation materials applied to the outside, which are then rendered or otherwise clad, also count as an add-on shell.

On internal walls, plasterboard or timber-panel cladding, composite panels or coarse chipboard are used, for example.