Footing Slab Building Codes & Rules
- Footing Slab Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.
Slab Thickening
Vapour
Barrier
Edge Rebate
Slab Thickening
NCC 2022 HP, 4.2.11 (5) (b)
NCC 2022 HP, 4.2.11 (5) (c)
NCC 2022 HP, 4.2.11 (5) (d)
NCC 2022 HP, 4.2.11 (5) (a)
Concrete Cover
- ≥ 30mm over membraneNCC 2022 HP, 4.2.11 (5) (b)
- ≥ 40mm unprotected groundNCC 2022 HP, 4.2.11 (5) (c)
- ≥ 20mm internal surfaceNCC 2022 HP, 4.2.11 (5) (d)
- ≥ 40mm external exposureNCC 2022 HP, 4.2.11 (5) (a)
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
AS 2870:2011, 3.3 (b)
Unreinforced Edge Footing
Loadbearing Wall
Loadbearing Wall
Brick Veneer
Fully Sarked
Brick Veneer
Slab on Ground
Vapour Barrier
Concrete to concrete contact between Footing & Slab
AS 2870:2011, 3.3 (b)
- Edge beam support not tied to the SlabAS 2870:2011, 3.3 (b)
Engaged Pier
AS 2870:2011, 3.3 (a)
Unreinforced Footing SlabAS 2870:2011, 3.3 (a)
- Ideal for flat sites, no connection between Footing & Slab
- For Class A sites
- Dune sands may require compaction
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
NCC 2022 HP, 4.2.16 (b)
NCC 2022 HP, 4.2.16 (a)
NCC 2022 HP, 4.2.16 (e)
NCC 2022 HP, 4.2.16 (d)
NCC 2022 HP, 4.2.16 (c)
Site Class A & S suitable for
- Articulated Masonry VeneerNCC 2022 HP, 4.2.16 (b)
- Clad FrameNCC 2022 HP, 4.2.16 (a)
- Full MasonryNCC 2022 HP, 4.2.16 (e)
- Articulated Full MasonryNCC 2022 HP, 4.2.16 (d)
- Masonry VeneerNCC 2022 HP, 4.2.16 (c)
Soil
Alternative Edge Beam Treatment
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
AS 2870:2011, 3.3 (b)
Concrete Benchmark
Termite Management
- Termite control required for Ground Level floor junctions
- ≥ 75mm slab exposure above the external finished floor level to allow easy detection of termites[1]
Termite MANAGEMENT
NCC 2022 V5
Class 1 & 10
NCC 2022 H1D3 & HP3.4.2 [2019 3.1.4.3]
May 2023
NCC 2022 HP, 3.4.2
AS 3660.1:2014, 4.4
NCC 2022 Vol 2, H1D3
- Termite Management compliant to the NCCNCC 2022 HP, 3.4.2
- Inspection ZoneAS 3660.1:2014, 4.4NCC 2022 Vol 2, H1D3
- ≥ 75mm exposed Concrete Face
- Smooth surface, free of Ripples or Honeycombing
- Tiling, Render, Vapour Barrier, Flashings, Structures & the like, not allowed to bridge this Zone
AS 3660.1:2014, 4.4
- Termite control required for Ground Level floor junctions
- ≥ 75mm slab exposure above the external finished floor level to allow easy detection of termitesAS 3660.1:2014, 4.4
AS 3660.1:2014, 4.4
Concentrated Load
Localised Thickening RULES
NCC 2022 V3
All Building Classes
NCC 2022, 4.2.20
May 2023
NCC 2022 HP, 4.2.20 (b)
NCC 2022 HP, 4.2.20 (c)
NCC 2022 HP, 4.2.20 (a) (i)
NCC 2022 HP, 4.2.20 (a) (ii)
- Centre Slab Thickening beneath steel columnNCC 2022 HP, 4.2.20 (b)
- SL72 reinforcement with ≥ 50mm concrete coverNCC 2022 HP, 4.2.20 (c)
- Concentrated load (see Table for Tiled or Timber Floor & Metal Roof)NCC 2022 HP, 4.2.20 (a) (i)NCC 2022 HP, 4.2.20 (a) (ii)
NCC 2022 HP, 4.2.20 (b)
NCC 2022 HP, 4.2.20 (c)
- Centered under steel ColumnNCC 2022 HP, 4.2.20 (b)
- SL72 reinforcementNCC 2022 HP, 4.2.20 (c)
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
NCC 2022 HP, 4.2.16
AS 2870:2011, 3.3 (a)
AS 2870:2011, 3.3 (b)
Slab Reinforcement
- ≤ 800mm CTS bar chairs spacing[1]
- Firmly fixed & supported off the ground[2]
- Wire chairs with concrete cover & placed on flat bases [3]
Reinforcement RULES
NCC 2022 V3
All Building Classes
NCC 2022 HP4.2.16 [2019:3.2.5.5]
May 2023
AS 2870:2011, 3.3
AS 2870:2011, 3.3
- Class A & S Slab Reinforcement as followsAS 2870:2011, 3.3
- SL82 for Slab ≥ 25m & < 30m
- SL72 for Slab ≥ 18m & < 25m
- SL62 for Slab > 12m & < 18m
- SL63 for Slab ≤ 12m
- For Western Australia, with Slabs length < 25m, thickness can be reduced to 85mm with Slab Reinforcement as followsAS 2870:2011, 3.3
- SL62 for Slab ≥ 18m & < 25m
- SL63 for Slab > 12m & < 18m
- SL53 for Slab ≤ 12m
NCC 2022 HP, 4.2.11 (7) (e)
NCC 2022 HP, 4.2.11 (7) (a)
NCC 2022 HP, 4.2.11 (7) (d)
- ≤ 800mm CTS bar chairs spacingNCC 2022 HP, 4.2.11 (7) (e)
- Firmly fixed & supported off the groundNCC 2022 HP, 4.2.11 (7) (a)
- Wire chairs with concrete cover & placed on flat bases NCC 2022 HP, 4.2.11 (7) (d)
Concrete Slab
Concrete Slab on Ground RULES
NCC 2022 V7
Class 1 & 10a
NCC 2022 HP13.2.6 [2019: 3.12.1.5]
May 2023
NCC 2022 HP, 13.2.6 (5) (b) (ii)
NCC 2022 HP, 13.2.6 (5) (b) (i)
NCC 2022 HP, 13.2.6 (4)
NCC 2022 HP, 13.2.6 (6) (a)
NCC 2022 HP, 13.2.6 (6) (b) (i)
- Under Slab
- R ≥ 2.0 in climate zone 8NCC 2022 HP, 13.2.6 (5) (b) (ii)
- Slab Edges
- R ≥ 1.0 in climate zone 8NCC 2022 HP, 13.2.6 (5) (b) (i)
- R ≥ 1.0 if in floor heating or cooling system installedNCC 2022 HP, 13.2.6 (4)
- Insulation
- Water-resistantNCC 2022 HP, 13.2.6 (6) (a)
- Continuous over the vertical edges or ≥ 300mm deepNCC 2022 HP, 13.2.6 (6) (b) (i)
NCC 2022 HP, 13.2.6 (5) (b) (ii)
NCC 2022 HP, 13.2.6 (5) (b) (i)
- Under Slab R ≥ 2.0NCC 2022 HP, 13.2.6 (5) (b) (ii)
- Slab Edges R ≥ 1.0NCC 2022 HP, 13.2.6 (5) (b) (i)
Recessed Slab
- Recess depth ≤ Slab thickness
- ≥ 400mm lap length[1]
- Recess depth ≥ Slab thickness
- ≥ 400mm Steel mesh overlap[2]
Recess Depth RULES
NCC 2022 V1
All Building Classes
NCC 2022 HP4.2.22
May 2023
NCC 2022 HP, 4.2.22 (1) (a)
NCC 2022 HP, 4.2.22 (1) (b) (i)
NCC 2022 HP, 4.2.22 (1) (b) (ii)
- If ≤ 1/2 of nominal slab thickness
- ≥ 400mm lap length of reinforcing mesh from inside face of the recessNCC 2022 HP, 4.2.22 (1) (a)
- If ≥ 1/2 of nominal slab thickness
- ≥ 400mm overlap of top & bottom reinforcing meshNCC 2022 HP, 4.2.22 (1) (b) (i)
- 2 layers of SL72 bottom reinforcing meshNCC 2022 HP, 4.2.22 (1) (b) (ii)
NCC 2022 HP, 4.2.22 (1) (a)
NCC 2022 HP, 4.2.22 (1) (b) (i)
- Recess depth ≤ Slab thickness
- ≥ 400mm lap lengthNCC 2022 HP, 4.2.22 (1) (a)
- Recess depth ≥ Slab thickness
- ≥ 400mm Steel mesh overlapNCC 2022 HP, 4.2.22 (1) (b) (i)
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