Wythe - Each continuous, vertical section of a wall, one masonry unit thick. Sometimes called a tier.

Stretcher - A masonry unit laid flat on its bed along the length of a wall with its face parallel to the face of the wall.

Header - A masonry unit laid flat on its bed across the width of a wall with its face per- pendicular to the face of the wall. Generally used to bond two wythes.

Row lock - A header laid on its face or edge across the width of a wall.

Bull header - A rowlock brick laid with its bed perpendicular to the face of the wall.

Bull stretcher - A rowlock brick laid with its bed parallel to the face of the wall.

Soldier - A brick laid on its end with its face perpendicular to the face of the wall.

BONDS

The term "bond" as used in masonry has three different meanings: structural bond, mortar bond, or pattern bond.

Structural bond refers to how the individual masonry units interlock or tie together into a single structural unit. You can achieve structural bonding of brick and tile walls in one of three ways:

Overlapping (interlocking) the masonry units;

Embedding metal ties in connecting joints; and

Figure 8-32.-Masonry units and mortar joints.