Final answer:
The minimum thickness for non-reinforced concrete floor slabs supported directly on the ground is typically 4 inches, as per the International Residential Code, but it can vary based on local building codes and specific building conditions.
Step-by-step explanation:
The question regarding the minimum thickness for concrete floor slabs that are supported directly on the ground pertains to building standards and regulations specific to engineering and construction. The answer can vary depending on building codes, but as a general guideline in the International Residential Code (IRC), which is often adopted by many jurisdictions, the minimum thickness for non-reinforced concrete floor slabs supported directly on the ground in residential construction is typically 4 inches.
However, this standard can change based on various conditions like the type of soil, the presence of additional loads, and whether the slab includes reinforcement. It's always important to check local building codes for the most accurate requirements as they can differ from the general guideline. Engineering professionals and construction workers must adhere to these standards to ensure the safety, stability, and longevity of the building structure.