Brik

They may be made clay, shale, soft slate, calcium silicate, concrete or shaped from quarried stone
 * What are they made of?


 * What are they used for?

They are used for mansory construction. Bricks are used for building and pavement. They are also used in the metallurgy and glass industries for lining furnaces


 * How many types of brick are there?

There are four types of bricks :
 * 1) Mud bricks: They are made of soft mud that is method is the most common, as it is the most economical.
 * 2) Dry pressed bricks: This bricks are made of with dry press method is similar to mud brick but starts with a much thicker clay mix, this method it's more expensive.
 * 3) Extruded bricks: Most structural bricks are made by this method. The bricks are lighter and easier to handle, and have thermal properties different from solid bricks.
 * 4) Calcium silicate bricks: The raw materials for calcium silicate bricks include lime mixed with quartz and mineral colourants. The bricks can be made in a variety of colours but white is the most common.


 * What is the meaning of brick laying techniques?

The brick laying techniques are referred to the way that the bricks are used and located to get the best construction.


 * Describe 2 brick laying techniques

__Common or American:__ is a variation of the running bond, having a course of full-lengthheaders at regular intervals that provide the structural bond as well as the pattern. Header courses usuallyappear at every fifth, sixth, or seventh course, depending on the structural bonding requirements.

__Stretcher bond:__ is the simplest repeating pattern but it is only suitable for a wall half a brick thick, the thinnest possible wall. Such a thin wall is not stable enough to stand alone, and must be tied to a supporting structure. It is common in modern buildings, particularly as the outer face of a cavity wall or as the facing to a timber framed structure.

Advantages: its low price, its aesthetic looks. Disadvantages: brick is not very strong.
 * What are their advantages and disadvantages?