Brick

**What are they made of?** Bricks may be made from clay, shale, soft slate, calcium silicate, concrete, or shaped from quarried stone.
 * __Questions about BRICK: __**

Bricks are used for building and pavement
 * What are they used for?

****How many types of brick are there?**  Bricklaying is a trade that specialises in building and repairing walls, floors, partitions, fireplaces, chimneys, as well as other structures with brick or concrete block. A bricklayer may use their skills for residential or large commercial development projects. Additionally, bricklayers may also refurbish brickwork on restoration projects. Bricklayers are responsible for a variety of work. Typically it involves hands on bricklaying like measuring the work area following the architect's plans, mixing mortar by hand or with a mechanical mixer, laying the bricks and applying the mortar, shaping and trimming bricks using bricklaying tools and checking that the brick wall is straight.
 * Bricks vary in their character as well as their composition: they may be solid perforated or hollow, but most fall into the solid category. Even bricks with small or large holes in them (these are also known as cellular) are classed as solid so long as the perforations do not exceed 25% of the total volume. The same is true of bricks with a shallow or deep indentation known as a frog. As well as making the bricks lighter, perforations and frogs give bricks a better key(ie, the mortar is better able to bond them together). Bricks are measured in two ways: when they come from the works the actual size is 215mm long, 102.5mm wide and 65mm deep; the format size, however is the one used for calculating the number of bricks you need. This needs an allowance of about 10mm added to each of these dimensions for the mortar joints - ie, 225mm long, 113mm wide and 75mm deep. Bricks are also made in special shapes and sizes for particular uses (copings, bull nose and angles are some examples).
 * What is the meaning of brick laying techniques?

****Describe 2 brick laying techniques clik on [|this site] to see a technique **

About the brick texts: Brick compares favorably with stone as a structural material for its fire-and-weather resisting qualities and for the ease of production, transportation, and laying.
 * a. Comparison and contrast**

The size of bricks is limited by the need for efficient drying, firing, and handling, but shapes, along with the techniques of bricklaying, have varied widely throughout history.
 * b. Description**

(for example, wedge-shaped bricks are sometimes employed in arch construction and bricks with rounded faces in columns).
 * c. Exemplification**

The commonest ancient Roman bricks were cut into triangles and laid with the base out and the apex set into a concrete filling that provided additional strength.
 * d. Cause/Effect**

the brick, grained greater popularity from the 16th. Century on, particularly in northern Europe. It is widely used in the 20th Century, often for nonbearing walls in steel frame constructions.
 * e. Chronology**