Residential Building Inspector Practice Exam

Where should reinforcement be supported in concrete slabs on ground floors during placement?

1. Bottom one-third of the slab

2. Middle of the slab

3. Top one-third of the slab

4. Center to upper one-third of the slab

The correct answer is: Center to upper one-third of the slab

In concrete slabs on ground floors, reinforcement should be positioned in the center to upper one-third of the slab. This placement is crucial because it offers optimal tensile strength and helps mitigate cracking due to shrinkage or temperature changes. Placing the reinforcement in the upper portion of the slab ensures better performance under bending stresses, as this is where tension forces are most likely to occur when the slab is subjected to loads. The positioning also allows for immediate support during the concrete curing process, as it remains within the effective zone of load distribution. Additionally, this arrangement accommodates potential vertical movements and supports uniform load distribution, significantly contributing to the structural integrity of the floor. By anchoring the reinforcement in this area, the slab can effectively channel stress away from weaker points, promoting longevity and resilience in residential building floors.