How much gravel do you put under concrete?

A minimum thickness is 4-6 inches of well compacted gravel should be your target. Any more depth of gravel is ok with the proviso that it be well compacted.Click to see full answer. Then, how many inches of gravel do you need for a concrete slab?Excavate the soil to a depth of 8 inches, allowing 4 inches for the gravel base and 4 inches for the concrete slab. what is the best base for concrete slab? Subgrade and subbase are the foundation of a concrete slab and play critical role in its performance. According to the ACI Code, the subgrade is a compacted and improved natural soil or brought infill whereas subbase is a layer of gravel placed on the top of the subgrade. Similarly, you may ask, what kind of gravel do you put under concrete? It should also compact easily and be evenly compacted before the concrete is poured to provide strength and stability. Recycled gravel is suitable for use beneath a concrete driveway as long as it is clean and uniform.Can you pour concrete over gravel?Laying a concrete driveway over an existing gravel one is possible, but it is not generally recommended. However, if the gravel in your driveway is small enough, it is possible to create a cement driveway over the existing one.

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