Specials † these are required for feature work and application to
various bonds, as shown on the preceding pages. Bonding is not
solely for aesthetic enhancement. In many applications, e.g. English
bonded manhole walls, the disposition of bricks is to maximise wall
strength and integrity. In a masonry wall the amount of overlap
should not be less than one quarter of a brick length. Specials may
be machine or hand cut from standard bricks, or they may be
purchased as purpose-made. These purpose-made bricks are
relatively expensive as they are individually manufactured in
hardwood moulds.
Ref. BS 4729: Clay and calcium silicate bricks of special shapes and
sizes. Recommendations.
Special Bricks