Soil Type: For example, if the project is to be installed onto a sandy soil area then we wouldn't have to excavate to the same depth as we would a similar project installed onto a clay foundation (Clay requires a deeper excavation because it retains water which contributes to the base heaving up during winter cycles; whereas sand filters the moisture away more efficiently).

Type of traffic: Is the area to be used for vehicles or just pedestrian traffic? A driveway for example, would require a deeper excavation than a walkway or patio. The reason for this is because a driveway used by vehicles would require more base material to ensure stability and avoid sinkage.

Note: At Highbury Stone we excavate approximately 11 inches for all pedestrian projects and 16 inches for all vehicle traffic projects regardless of the soil type, just to ensure stability for every job.