Maximum spacing of reinforcement

For slabs less than 200 mm thick the following maximum spacing rules apply:

■ For the principal reinforcement: 3h but not more than 400 mm

■ For the secondary reinforcement: 3.5h but not more than 450 mm

The exception is in areas with concentrated loads or areas of maximum moment where the following applies:

■ For the principal reinforcement: 2h but not more than 250 mm

■ For the secondary reinforcement: 3h but not more than 400 mm Where h is the depth of the slab.

For slabs 200 mm thick or greater the bar size and spacing should be limited to control the crack width and reference should be made to section 7.3.3 of the Code or Chapter 2, originally published as Getting started5.

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