Wood Destroying Organism (WDO) Home Inspection Practice Exam

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In floating slab construction, how are the foundation wall and footing related to the slab floor?

  1. They are merged

  2. They are separated by an expansion joint

  3. They are the same material

  4. They are supported by piers

The correct answer is: They are separated by an expansion joint

In floating slab construction, the foundation wall and footing are separated by an expansion joint from the slab floor. This design allows for independent movement between the slab and the wall or footing due to settling, temperature changes, or other forces acting on the structure. The use of an expansion joint helps to prevent cracks and damage that might occur if the slab were rigidly connected to the foundation. Such separation is essential in areas where soil movement may affect the stability of the structure, making it a vital consideration in foundation design. Other options, while they describe different construction methods, do not pertain to floating slab construction. For instance, merging the foundation and slab could lead to structural issues from differential movement. Making them from the same material might not address movement stresses adequately. Supporting them by piers involves a different foundational approach suited for soils with specific challenges, rather than the flexibility needed in a floating slab design.