First-rate burnt-clay bricks are superior in terms of quality and durability. These premium burnt clay slabs have no defects and command a premium price. When fired clay bricks are used for wall construction, they must be plastered or rendered with mortar.
Unless otherwise specified, bricks should be set in English bond and well-bonded. Each course must be perfectly horizontal, and the walls must be perfectly vertical. Vertical joints of consecutive courses should not overlap directly; however, vertical joints of alternate courses should overlap directly.
The general principles that must be observed for a sound brick masonry structure are as follows: The bricks used in a good work must be sound, durable, and uniform in size, shape, and colour. They should be free of fractures and defects, and a fractured surface should be devoid of cavities, grit, lime particles, etc.
Class A engineering bricks are the most durable, while Class B bricks are the most popular. The hues of engineering bricks range from red to blue.