kilns. These bricks do not have special scoringsor markings and are not produced in any specialcolor or surface texture. Common brick is alsoknown as hard- and kiln-run brick. It is usedgenerally for backing courses in solid or cavitybrick walls. The harder and more durable kindsare preferred for this purpose.FACE bricks are used in the exposed face ofa wall and are higher quality units than backupbrick. They have better durability and appearance.The most common colors of face brick arevarious shades of brown, red, gray, yellow, andwhite.CLINKER bricks are bricks that have beenoverburned in the kilns. This type of brick isusually hard and durable and may be irregular inshape. Rough hard corresponds to the clinkerclassification.PRESS bricks are made by the dry pressprocess. This class of brick has regular smoothfaces, sharp edges, and perfectly square corners.Ordinarily, all press brick are used as facebrick.GLAZED bricks have one surface of eachbrick glazed in white or other colors. The ceramicglazing consists of mineral ingredients that fusetogether in a glass-like coating during burning.This type of brick is particularly suited for wallsor partitions in hospitals, dairies, laboratories, orother buildings where cleanliness and ease ofcleaning are necessary.FIREBRICK is made of a special type of fireclay that will withstand the high temperatures offireplaces, boilers, and similar usages withoutcracking or decomposing. Firebrick is larger thanregular structural brick, and often, it is handmolded.CORED BRICK are made with two rows offive holes extending through their beds to reduceweight. There is no significant difference betweenFigure 7-52.—Types of brick masonry bond.7-32
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