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Sub-base Thickness Guide

Sub-base Thickness/Depth Guide

Ascertaining Required Sub-base Depth

If you have not yet calculated the CBR value of your sub-base, please visit the page Assessing Ground Conditions before returning to this page to work out the required sub-base depth.

The MoT Type 3 hardcore sub-base depth will vary from project to project, dependent on the volume and weight of the traffic using the surface as well as the ground stiffness. See the table below to work out the required sub-base depth.

Sub-base Thickness Table

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