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If your using Type 1 below paving I've always believed 100mm thickness as the minimum usually required.
Increased amount required due to compaction will be effected by whether you are originally buying in loose by weight or in bulk bags by volume. I'd personally allow an extra 20% to be on the safe side and always factor a contingency in the amount of materials required into the quotation.
It's artificial lawn base. I would usually factor in contingency but need to be as tight as possible/near exact!! on this one