Sub-base reinstatement (S7.2)

General

S7.2.1

In a rigid road, the sub-base is deemed to be any layer of imported granular or HBM immediately below the base of the concrete road slab. Where such a sub-base exists, a similar or equivalent material must be laid to match the existing thickness subject to a minimum thickness of 150 mm.

S7.2.2

Permitted options as shown in A5 are subject to the following exceptions:

Small openings and narrow trenches

S7.2.3

A CBGM base may also be used as sub-base of 150 mm thickness in small openings and narrow trenches regardless of whether the existing sub-base is cement bound.

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