North Carolina Building Contractor License Practice Exam

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What is the maximum span that jack arch construction requires steel support when the opening exceeds how many feet?

3 feet
5 feet
9 feet
7 feet

The correct answer is: 9 feet

Jack arch construction uses a flattened arch design that requires proper support to ensure structural integrity, especially when spanning openings. The maximum span that requires steel support in jack arch construction is crucial for maintaining safety and stability as the size of an opening increases. When the opening exceeds 9 feet, the load becomes too great for the jack arch alone to support effectively, thereby necessitating the use of steel support to adequately distribute and bear the weight above the opening. This ensures that the construction can handle the loads it will encounter without risk of failure. Understanding the need for steel support at specific spans is essential for contractors to ensure compliance with building codes and standards, providing safety and longevity to the structures they work on. The choice indicating 9 feet emphasizes the importance of recognizing when additional support is necessary during construction practices.