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Spacing between reinforcing bars
With designs to EC2 the minimum spacing between bars should be greater than the bar size, the maximum aggregate size + 5mm, or 20mm.
With designs to BS8110 the minimum horizontal spacing between bars should be greater than the bar size or the maximum aggregate size + 5mm. The minimum vertical spacing between bars should be greater than the bar size or 2/3 of the maximum aggregate size.
Acknowledgement:
The Concrete Society
