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Things to know about interlock installation

• What is the correct depth to excavate for a interlock project?
  This is a tricky question to answer because there are a few key factors that contribute to what the correct depth of excavation should be.



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).

Things to know about flagstone installation

For example, if we were to install an interlock project for pedestrian traffic only onto a clay foundation, the steps are as follows:

1. The area is first marked out and then excavated approximately 11 inches.
2. Approximately 7 inches of ¾ inch crushed limestone base material is installed into the excavated area, compacting every 2 inches to ensure stability.
3. Then approximately 1 - 1½ inches of fine crushed limestone (screening) or sand is installed as a levelling base.