What bond consists of alternating headers and stretchers in every other course and appears in vertical lines?

The bond that consists of alternating headers and stretchers in every other course, creating a unique pattern that appears in vertical lines, is known as Flemish bond. This technique is characterized by headers (the short end of a brick) interspersed with stretchers (the long side of a brick), which creates a visually appealing design that also provides strength to the wall.

In Flemish bond, every course alternates between a header and two stretchers, which is distinct from other methods like English bond, where each course contains a consistent pattern of headers followed by a row of stretchers. This alternating pattern in Flemish bond not only enhances the aesthetic appeal of the masonry but also adds to the structural integrity, distributing loads effectively.

When constructing walls using this method, bricklayers need to pay careful attention to alignment and spacing to ensure that the bond is maintained throughout the structure, resulting in a strong and attractive finish. This aspect of design and construction is crucial for understanding the principles of masonry which is often tested in exams related to residential contracting in Tennessee.