Generally, the degree of accuracy in calculations depends upon the rate of the item of work: Items of work with high rates shall be measured more accurately than items of work - with lower rates.
(a) The dimensions shall be taken to the nearest 0.01 m except for
- thickness of slab which shall be measured to the nearest 0.005 m.
- woodwork to the nearest 0.002 m,
- structural steelworks to the nearest 0.001 m, and
- thickness of roadwork (where the thickness is less than 200 mm) to the nearest 0.005 m.
(b) Areas shall be worked out to the nearest 0.01 sq m. For steelworks, areas excluding cross-sectional measurements shall he worked out to the nearest 0.001 sq m.
(c) Cubic contents shall be worked out to the nearest 0.01 cu m except for woodwork, which shall be worked out to the nearest 0.001 cu m.
(d) Weights shall be worked out to nearest 1.0 kg.
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