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When constructing a masonry wall, which bond pattern results in the weakest wall?

  1. Running

  2. Common

  3. English

  4. Stack

The correct answer is: Stack

The stack bond pattern results in the weakest masonry wall because it aligns the faces of the units directly on top of each other, creating a vertical joint that runs continuously from the top of the wall to the bottom. This configuration does not distribute loads evenly, as the vertical joints do not stagger. Consequently, it lacks redundancy in load transfer, making it susceptible to failure under load or stress. In contrast, bond patterns such as running, common, and English introduce staggering of the joints, which enhances the wall's overall strength and stability by interlocking the units more effectively.