Interlocking Precast Blocks challenge the conventional methods of construction by building a wall without the need for columns, designed to conceal both electrical and water piping and offer superior insulation properties. Specified manufacturing sizes of blocks allow for 10mm (3/8 in) mortar joints and satisfy the concept of basic size, i.e. the basic scape to be occupied by the block and its share of the joints, in accordance with BS 3626, “Recommendations for System of Tolerances and Fits for Building”.