What Is Grade On Slab?The Slab On Grade is defined as a directly laid on the earth surface for supporting the structural elements and walls.
The minimum thickness of grade on slab is depending upon the soil characteristics and porosity and generally 4 inches thickness is considered on the grade of slab. The slab on grade is also known as a floating slab.

Slab on Grade is popularly used in that area where the ground doesn’t freeze. These types of slabs may or may not use reinforcement on them and the decision of inserting or using reinforcement is depend upon the local building codes and floor loads.

For safety purposes, a layer of bitumen and gravel is laid on the earth surface before laying the concrete slab for preventing moisture into the slab.