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Typically the main loads taken by the foundations are carried there by the inner leaf, and the major functions of the external leaf are to protect the whole from weather, and to provide a fitting aesthetic finish.
Despite there being no masonry connection between the leaves, their transverse rigidity still needs to be guaranteed.
Some headers have a glazed face, caused by using salt in the firing.
Sometimes Staffordshire Blue bricks are used for the heading bricks.
The advent during the mid twentieth century of the cavity wall saw the popularisation and development of another method of strengthening brickwork—the wall tie.
A cavity wall comprises two totally discrete walls, separated by an air gap, which serves both as barrier to moisture and heat.
Much older examples of brickwork made with dried (but not fired) bricks may be found in such ancient locations as Jericho in Judea, Çatal Hüyük in Anatolia, and Mehrgarh in Pakistan.Accordingly, a single-leaf wall is a half brick thickness; a wall with the simplest possible masonry transverse bond is said to be one brick thick, and so on.The thickness specified for a wall is determined by such factors as damp proofing considerations, whether or not the wall has a cavity, load-bearing requirements, expense, and the era during which the architect was or is working.The half-bat sits at the centre of the group and the four bricks are placed about the half-bat, in a square formation.These groups are laid next to each other for the length of a course, making brickwork one and a half bricks thick.