| The work | Grade and patch, again and again | Engineered concrete: formwork and a pour | A grader, water cart and roller binding the base you already have |
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| Out of service | Every time an area has to be repaired | Weeks, while the slab reaches working strength | Trafficable within hours of the final roll* |
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| Cost | Recurring grader and patching hours | A rate that is hard to justify across a whole yard | Indicatively 60–70% below engineered concrete* |
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| Scope | Never actually finishes the job | Minimum quantities make one or two areas uneconomic | Area by area, staged so the yard keeps trading |
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