North Carolina Building Contractor License Practice Exam

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If masonry blocks are stacked higher than 6ft, what must be done above the 20ft line?

  1. Stack must be straight

  2. Stack must be tapered back 1 half block per tier

  3. Stack must be doubled

  4. Stack must be sealed

The correct answer is: Stack must be tapered back 1 half block per tier

In masonry construction, when blocks are stacked higher than 6 feet, it is imperative to ensure stability and safety. Stacking must be tapered back one half block per tier above a height of 20 feet to prevent the stack from becoming unstable and to reduce the risk of toppling. This technique helps to distribute the weight more evenly and lowers the center of gravity of the stacked blocks, making the structure more secure in conditions such as wind or seismic activity. The practice of tapering the stack also complies with safety regulations and standards in construction, ensuring that workers on site are protected and that the integrity of the construction is maintained. By employing this method, any potential hazards associated with tall stacks are mitigated. Adhering to this guideline is critical for maintaining structural integrity and compliance with safety protocols in masonry work.