Clay bricks typically weather and age aesthetically. Brick constructions, when designed and built well, using appropriate materials, stand the test of time.
Extreme conditions, such as constant damp or regular freezing, call for engineering bricks. They are often used for building manholes and sewers. They have a smooth finish, and several core holes to allow mortar or steel bar reinforcement to be added. Capable of handling high compressive strength, engineering bricks are good for damp coursing, and tunnels.