Question

What is not a characteristic of a slab on grade?

1) Level with ground
2) Vapor barrier underneath
3) Grass and sod underneath
4) Gravel aggregate under subbase

Answer 1

The characteristic not typical of a slab on grade is having grass and sod underneath because it can lead to settling or cracking of the concrete.

Step-by-step explanation:

The characteristic that is not typical of a slab on grade is having grass and sod underneath. A slab on grade is typically a concrete slab poured directly on the ground and is used as a foundation for buildings. The standard components of a slab on grade include being level with the ground to provide a flat surface, a vapor barrier to prevent moisture from seeping into the concrete and causing damage, and a layer of gravel aggregate beneath a subbase to facilitate drainage and provide a stable base. Grass and sod would not be placed underneath a slab as they can decompose and cause the slab to settle or crack.