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When laying bricks, the manner in which the bricks overlap is called the bond. A brick laid with its longest side exposed is called a stretcher, as opposed to a header, where only the end of the brick can be seen in the brickwork.
The thickness of brickwork is measured in units of brick. If you put some bricks down end-to-end with the long side facing you (stretchers) and then another row on top, the wall thickness half a brick.
There are a number of different bonds used.
This is the most common bond in modern times, as it is easy to lay. It consists of course entirely comprised of stretchers, offset by half a brick length. As it uses no headers it is a thin wall (half a brick thickness); this enables two walls to be built close together and the gap filled as
This bond is made up of alternating courses of stretchers and headers. This produces a solid wall that is a full brick in width. It is fairly easy to lay.
Flemish Bond is the most decorative common bond. It is created by alternately laying headers and stretchers in a single course. The next course is laid so that a header lies in the middle of the strecher in the course below. Again this bond is one brick thick.
These bonds are variations on normal bonds which require fewer bricks and are thus less sturdy than the normal bonds. However using fewer bricks means that they are cheaper to lay. As such they are most commonly used for garden and other non-load-bearing walls.
When bricks are laid on an angle, it is called a Herringbone.