kilns. These bricks do not have special scorings
or markings and are not produced in any special
color or surface texture. Common brick is also
known as hard- and kiln-run brick. It is used
generally for backing courses in solid or cavity
brick walls. The harder and more durable kinds
are preferred for this purpose.
FACE bricks are used in the exposed face of
a wall and are higher quality units than backup
brick. They have better durability and appearance.
The most common colors of face brick are
various shades of brown, red, gray, yellow, and
white.
CLINKER bricks are bricks that have been
overburned in the kilns. This type of brick is
usually hard and durable and may be irregular in
shape. Rough hard corresponds to the clinker
classification.
PRESS bricks are made by the dry press
process. This class of brick has regular smooth
faces, sharp edges, and perfectly square corners.
Ordinarily, all press brick are used as face
brick.
GLAZED bricks have one surface of each
brick glazed in white or other colors. The ceramic
glazing consists of mineral ingredients that fuse
together in a glass-like coating during burning.
This type of brick is particularly suited for walls
or partitions in hospitals, dairies, laboratories, or
other buildings where cleanliness and ease of
cleaning are necessary.
FIREBRICK is made of a special type of fire
clay that will withstand the high temperatures of
fireplaces, boilers, and similar usages without
cracking or decomposing. Firebrick is larger than
regular structural brick, and often, it is hand
molded.
CORED BRICK are made with two rows of
five holes extending through their beds to reduce
weight. There is no significant difference between
Figure 7-52.—Types of brick masonry bond.
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