Leca-bricks are made ​​of Leca concrete with a dry density of 800 kg/m. 3 switch Leca bricks equals 1 switch Leca block and the ordinary planning module 2 M.

They are used in foundations, largely in relation to adaptations to different heights, for respectively, the front and back wall. The bricks are also very suitable for switch transition adjustment, for example, door openings.