I'm looking to lay a slab of concrete up to 9 inches thick for a summer house, can someone let me know what depth the hardcore/scalpings needs to be under this layer. The thickness of the concrete is determined by a raised patio onto which the summer house doors open.
for a concrete base that thick, you will need reinforcing mesh to stop it from cracking, not a lot of hardcore is required unless the ground is constantly wet, 50mm thick will do, but it must be well compacted, so hire a plate compactor for the job.
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