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It largely depends on what the hardcore is for. If you are laying a damp proof membrane on top to then pour a slab, a nominal 50mm sand blind on top of the compacted hardcore is usually required - this is to ensure no sharp stones in the hardcore punctures the membrane. What is the hardcore...

Plastic sections are more than suitable for this application. I am currently in the process of a self build and despite carrying out rigorous utility checks, when we opened the ground for footings we discovered a 160mm (internal diameter) salt glaze pipe some 100 years old running across the...