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According to the Florida Building Code, when should the moisture treatment be applied to the soil in construction?

  1. Before laying the slab

  2. At the time of reviewing plans

  3. After the foundation is poured

  4. During excavation and filling

The correct answer is: During excavation and filling

Moisture treatment is applied to the soil during the excavation and filling process to ensure proper soil compaction and to mitigate issues related to moisture retention, which can affect the stability of the foundation. This step is crucial as it prepares the site for the construction of a robust and lasting structure. Treating the soil at this stage helps to minimize potential issues related to moisture, such as settlement or heaving, which can lead to structural complications later on. Applying moisture treatment before laying the slab or after the foundation is poured does not take advantage of the opportunity to address moisture issues effectively during the ground preparation phase. Similarly, reviewing plans is an administrative step that does not directly pertain to the physical treatment of the soil. Therefore, the most effective timing for moisture treatment is indeed during the site preparation activities such as excavation and filling.