Stiffened Raft Slab Building Codes & Rules


- Stiffened Raft Tools™ simplifies the National Construction Code (NCC) with interactive graphics, including deemed to comply & best practices.


NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

DNCC 2022 HP, 4.2.14AS 2870:2011, 3.2.3

Soil Class A, S or M Only

Masonry Veneer

Beam Spacing

Edge Rebate

AS 2870:2011, 3.5.4

Construction Joint

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

< 1mNCC 2022 HP, 4.2.14AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

300NCC 2022 HP, 4.2.14AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

500NCC 2022 HP, 4.2.14AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

100NCC 2022 HP, 4.2.14AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

150NCC 2022 HP, 4.2.14AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

DNCC 2022 HP, 4.2.14AS 2870:2011, 3.2.3

Brick

Veneer

Loadbearing Wall

Slab Thickening

Internal Beam

Loadbearing Wall

Timber Frame

Brick Veneer

Fully Sarked

Slab on Ground

Vapor Barrier

Edge Beam

Reinforcement


  • ≤ 800mm Bar Chair spacing[1]
  • Top & bottom Bars of equal size & specification[2]
  • Fix Ties to prevent movement[3]


Chair RULES


NCC 2022 V3


All Building Classes


NCC 2022, 4.2.11 [2019:3.2.3.2]


May 2023



NCC 2022 HP, 4.2.11 (7) (e)

NCC 2022 HP, 4.2.11 (7) (a)

NCC 2022 HP, 4.2.11 (7) (b)

NCC 2022 HP, 4.2.11 (7) (b)

NCC 2022 HP, 4.2.11

Reinforcement RULES


NCC 2022 V3


All Building Classes


NCC 2022 HP 4.2.11, HP 4.2.14 [2019:3.2.3.2]


May 2023



NCC 2022 HP, 4.2.14

NCC 2022 HP, 4.2.11 (4) (c)

NCC 2022 HP, 4.2.11 (4) (c)

NCC 2022 HP, 4.2.11 (4) (a)

NCC 2022 HP, 4.2.11 (4) (b)

NCC 2022 HP, 4.2.11 (4) (c)

NCC 2022 HP, 4.2.11

NCC 2022 HP, 4.2.14

NCC 2022 HP, 4.2.11 (7) (e)

NCC 2022 HP, 4.2.11 (7) (a)

AS 2870:2011, 3.4.3

Concentrated Load


  • Centred beneath steel Column[1]
  • SL72 reinforcement[2]


Localised Thickening RULES


NCC 2022 V1


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)

NCC 2022 HP, 4.2.20 (b)

NCC 2022 HP, 4.2.20 (c)

Beam Layout


  • Integral structural grid form[1]
  • Reinforcement for Edge & Internal Beam [2]
  • Varies based on Site Class (A, S, or M)


Beam Layout RULES


NCC 2022 V4


All Building Classes


NCC 2022 HP4.2.14


May 2023



NCC 2022 HP, 4.2.14

NCC 2022 HP, 4.2.14

AS 2870:2011, 5.3.9

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

NCC 2022 HP, 4.2.14

NCC 2022 HP, 4.2.14

Concrete Cover


  • ≥ 30mm over membrane[1]
  • ≥ 40mm unprotected ground[2]
  • ≥ 20mm internal surface[3]
  • ≥ 40mm external exposure[4]


Concrete COVER


NCC 2022 V5


All Building Classes


NCC 2022 4.2.11 [2019 3.2.3.2]


May 2023



AS 3600:2018, 4.10.3.2

AS 3600:2018, 4.3.1 (c)

NCC 2022 HP, 4.2.11

NCC 2022 HP, 4.2.11 (5) (b)

NCC 2022 HP, 4.2.11 (5) (a)

NCC 2022 HP, 4.2.11 (5) (c)

NCC 2022 HP, 4.2.11 (5) (d)

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]


Durable Notice RULES


NCC 2022 V1


All Building Classes


NCC 2022, 3.4.3


May 2023



NCC 2022 HP, 3.4.3

NCC 2022 HP, 3.4.3

NCC 2022 HP, 3.4.3 (a)

NCC 2022 HP, 3.4.3 (b)

NCC 2022 HP, 3.4.3 (c)

NCC 2022 HP, 3.4.3 (d)

Termite RISK


NCC 2022 V3


Class 1 & 10


NCC 2022, H1D3 & HP3.4.1 [2019 3.1.4.2]


May 2023



NCC 2022 HP, 3.4.1(2)

NCC 2022 HP, 3.4.1 (1) (b)

NCC 2022 HP, 3.4.1

  • Termite Management System Required ifNCC 2022 HP, 3.4.1(2)
  • Location is identified at Risk of Attack, &
  • Any Primary Building Element is susceptible
  • Primary Building Elements areNCC 2022 HP, 3.4.1 (1) (b)
  • Any member designed to take Loads
  • Wall, Roof, Ceiling, Floor, Ramp or Stair Framing
  • Any bracing or other framing members
  • Materials not susceptible to attackNCC 2022 HP, 3.4.1
  • Metals
  • Concrete
  • Masonry
  • Fibre-reinforced Concrete
  • Naturally resistant Timber
  • Preservative-treated Timber

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

Concrete Slab


  • Under Slab R ≥ 2.0[1]
  • Slab Edges R ≥ 1.0[2]


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)

NCC 2022 HP, 13.2.6 (5) (b) (ii)

NCC 2022 HP, 13.2.6 (5) (b) (i)

AS 2870:2011, 3.2.3

AS 3660.1:2014, 4.4

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

AS 2870:2011, 3.2.3

NCC 2022 HP, 4.2.14

AS 2870:2011, 3.2.3

Articulated Brickwork

Recessed Slab


  • Recess depth Slab thickness
  • ≥ 400mm lap length[1]
  • Recess depthSlab thickness
  • ≥ 400mm Steel mesh overlap[2]


Recess Depth RULES


NCC 2022 V3


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)

NCC 2022 HP, 4.2.22 (1) (a)

NCC 2022 HP, 4.2.22 (1) (b) (i)

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