Because brick by itself does not provide adequate resistance to the transfer of heat, to meet the requirements of the Building Regulations for the conservation of fuel and power, it is used in combination with other materials in external cavity walling for most heated buildings. In consequence brick walling 1 B and thicker is less used than it was.
Solid brick walls may be used for heated and unheated buildings for arcades, screen walling and as boundary and earth retaining walling for the benefit of the appearance and durability of the material.
For the same reason that a B wall is bonded along its length a solid wall 1 B and thicker is bonded along its length and through its thickness.
The two basic ways in which a solid brick wall may be bonded are with every brick showing a header face with each header face lying directly over two header faces below or with header faces centrally over a stretcher face in the course below, as illustrated in Fig. 54.
The bond in which header faces only show is termed ‘heading’ or ‘header bond’. This bond is little used as the great number of vertical joints and header faces is generally considered unattractive.
The bond in which header faces lie directly above and below a stretcher face is termed Flemish bond. This bond is generally considered the most attractive bond for facing brickwork because of the variety of shades of colour between header and stretcher faces dispersed over the whole face of the walling. Figure 54 illustrates brickwork in Flemish bond.
English bond, illustrated in Fig. 55, avoids the repetition of header faces in each course by using alternate courses of header and stretcher faces with a header face lying directly over the centre of a stretcher face below. The colour of header faces, particularly in facing bricks, is often distinctly different from the colour of stretcher faces. In English bond this difference is shown in successive horizontal courses. In Flemish bond the different colours of header and stretcher faces are dispersed over the whole face of a wall, which by common consent is thought to be a more attractive arrangement.
Fig. 54 Header and Flemish bond.
Fig. 55 English bond.