Construction Supervisor License Practice Exam 2025 – All-in-One Study Guide for Exam Success!

The minimum thickness for concrete slabs placed directly on the ground in an industrial park is generally determined by structural integrity, load-bearing capacity, and potential moisture issues. A thickness of 3½ inches provides a balanced approach for various applications, offering sufficient strength to support typical industrial loads while also addressing concerns like cracking, settling, and the effects of frost heave.

The dimensions of 3½ inches allow for the concrete to be thick enough to withstand the stresses encountered in industrial environments without over-engineering the slab, thus maintaining cost-effectiveness. Additionally, this thickness can work well with or without a vapor barrier, which plays an essential role in controlling moisture transmission from the soil below but is not a strict requirement for the structural integrity of the slab. Therefore, the choice of 3½ inches caters to flexibility in construction while adhering to standard practices in the industry.

In comparison, the other options either suggest a thickness that may not meet practical load-bearing needs or impose unnecessary constraints regarding the use of vapor barriers. Understanding the engineering principles and building codes in concrete construction is critical for making informed decisions about slab specifications in different settings.