What is the maximum vertical distance allowed between headers when building multi-wythe masonry walls?

What is the maximum vertical distance allowed between headers when building multi-wythe masonry walls?

• A. 24 inches
• B. 18 inches
• C. 30 inches
• D. 36 inches

Answer: (A)

Headers connect the wythes of a multi-wythe masonry wall, ensuring the wall acts as a single structural unit by transferring loads and resisting differential movement. To keep that connection reliable through the wall’s height, the vertical distance between headers is limited. The standard maximum is 24 inches, meaning a header should be placed no more than two feet apart vertically. This spacing maintains effective load transfer and helps prevent bowing, cracking, or separation between wythes. A larger gap could allow movement between wythes, while a smaller gap is simply more frequent than necessary but still acceptable.

Headers connect the wythes of a multi-wythe masonry wall, ensuring the wall acts as a single structural unit by transferring loads and resisting differential movement. To keep that connection reliable through the wall’s height, the vertical distance between headers is limited. The standard maximum is 24 inches, meaning a header should be placed no more than two feet apart vertically. This spacing maintains effective load transfer and helps prevent bowing, cracking, or separation between wythes. A larger gap could allow movement between wythes, while a smaller gap is simply more frequent than necessary but still acceptable.