5.1 Substructure and ground-bearing floors

Also see:

5.2

5.1.8 Infill up to 600mm deep

Infill beneath ground-bearing floors shall be a maximum of 600mm deep.

Ground-bearing slabs are not acceptable where infill exceeds 600mm in depth.

Where the design requires in excess of 600mm of infill at any point within a self-contained area, the floor construction over the whole of that area is required to be independent of the fill and capable of supporting:

  • self-weight
  • non load-bearing partitions
  • other imposed loads.

Generally this should be achieved with the use of a suspended slab. See Chapter 5.2.

Last updated: 2nd January 2024

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