Bricks

Bricks are made from ordinary clay, moulded and burnt in kilns. They could be hand moulded or machine pressed or extruded and wire cut. They should be well burnt, of uniform color, free from cracks and nodules of free lime. They have, commonly, a depression on one flat face, called as a frog that enables better keying of the mortar joint. Bricks are available within the traditional nominal dimensions of 22.9 × 11.4 × 7.5 cm (actual 22.5 cm × 11.1 cm × 7 cm) or modular nominal sizes of 20 cm × 10 cm × 10 cm (actual 19 cm × 9 cm × 9 cm).

The traditional brick sizes vary in various parts of the country along with length from 21 to 25 cm, width 10 to 13 cm and height 7 to 7.5 cm. With a view to achieve uniformity of size throughout the country, the Bureau standardized the modular size of bricks.