BASE
To be flat, smooth and level to within +/- 10mm
GROUND TYPES
It is important to establish the stability of the ground to determine the thickness of the compacted hardcore.
Bases constructed of paving slabs will require a more substantial compacted hardcore base due to the increased potential of movement.
To enable identification of subsoil “ground type” the following field or site ‘Heel test’ shall be used.
HEEL TEST
Remove the top vegetated soil layer until the processed level for the addition of hardcore is reached. A full grown man is then to stand on one leg on the heel of one foot on the exposed soil layer. The man then steps off and inspects whether or not any imprint is made.
The results of the test should be compared to the following table to determine the recommended minimum thickness of compacted hardcore.
All hardcore must be compacted using a wacker plate.
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