Waffle Raft Slab Building Codes & Rules


- Learn how to build efficient concrete slabs on poor-quality soils with these expert tips on reinforcement, drainage, and slab joints, all simplified with Tools™


Pier

Waffle Pod

Vapour Barrier

Sand Blinding

Edge Beam

Finished Concrete Floor Level

Timber Frame

Waffle Pod

Full Sarking

Clad Frame

Flashing

Concrete Benchmark

Masonry Veneer

AS 2870:2011, 3.4.1

≥ 300AS 2870:2011, 3.4.1

Slab Edge Reinforcement



Slab Edge Reinforcement


NCC 2022 V1


NCC 2022 HP, 4.2.11 (7) (e)

NCC 2022 HP, 4.2.11 (7) (a)

NCC 2022 HP, 4.2.11 (7) (d)

Soil

- copy

AS 2870:2011, 3.4.2

110AS 2870:2011, 3.4.2

Soil

Loadbearing Wall

AS 2870:2011, 3.4.1

≤ 1.09mAS 2870:2011, 3.4.1

AS 2870:2011, 3.4.1

85AS 2870:2011, 3.4.1

Industry Recommendation

≥ 450Industry Recommendation

AS 2870:2011, 3.4.1

DAS 2870:2011, 3.4.1

Waffle Pod

AS 2870:2011, 3.4.1

20AS 2870:2011, 3.4.1

Masonry Veneer

Loadbearing Wall

AS 3660.1:2014, 4.4

≥ 75AS 3660.1:2014, 4.4

Soil Classification

Vapour Barrier


  • Continuous under Beams & Pods[1]
  • Turn up to Ground Level at Slab Edges[2]
  • Protect from & repair any punctures[3]


Moisture Control


NCC 2022 V1


All Building Classes


NCC 2022, F1D7 & Part 4.2.8 [2019 F1.10, 3.2.2.6]


May 2023



AS 2870:2011, 5.3.3.2 (a)

AS 2870:2011, 5.3.3.2 (a) (i)

AS 2870:2011, 5.3.3.2 (a) (ii)

AS 2870:2011, 5.3.3.4 (b)

AS 2870:2011, 5.3.3.4 (a)

AS 2870:2011, 5.3.3.4 (c)

NCC 2022 HP, 4.2.8

NCC 2022 Vol 1, F1D7

AS 2870:2011, 5.3.3.4 (a)

AS 2870:2011, 5.3.3.4 (a)

AS 2870:2011, 5.3.3.3 (c)

Edge Rebate

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)

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 Mix


  • N20 Grade to AS 1379[1]
  • ≥ 20 Mpa strength at 28 days[2]
  • ≤ 20mm aggregate size[3]
  • 100mm slump[4]
  • Properly compacted[5]


Concrete Mix RULES


NCC 2022 V4


All Building Classes


NCC 2022, 4.2.10 [2019 3.2.3.1]



May 2023



NCC 2022 HP, 4.2.10

  • Concrete to comply with NCCNCC 2022 HP, 4.2.10
  • Mixing & Delivery
  • ≤ 1 ½ hrs complete discharge from Concrete truck upon Cement hydration unless a retarder is used
  • Compaction by vibration
  • To remove air pockets
  • Improve contact with Reinforcement & Formwork
  • Enhance durability
  • Avoid over-vibrating
  • Slab Edges
  • Proper finishing & curing of edges improves resistance to moisture damage
  • Chemical Curing
  • Determine if surface finish adhesive to be used is compatible with chemical curing methods

NCC 2022 HP, 4.2.10 (a) (i)

NCC 2022 HP, 4.2.10 (a) (ii)

NCC 2022 HP, 4.2.10 (a) (iii)

NCC 2022 HP, 4.2.10 (c)

AS 2870:2011, 5.3.1

AS 2870:2011, 3.4.2

AS 2870:2011, 3.4.2

AS 2870:2011, 3.4.1

Pier


  • For M or H Sites[1]
  • Each 3rd internal Beam intersection[2]


Pier RULES


NCC 2022 V3


All Building Classes


NCC 2022 H1D4 & 4.2 [2019 3.2]


May 2023



AS 2870:2011, 3.4.5

AS 2870:2011, 3.4.5 (a)

AS 2870:2011, 3.4.5 (b)

AS 2870:2011, 3.4.5 (b)

NCC 2022 Vol 2, H1D4

AS 2870:2011, 3.4.5 (a)

AS 2870:2011, 3.4.5

Concrete Slab Insulation


  • Under Slab ≥ R2.0[1]
  • Slab Edges ≥ R1.0[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)

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 Mesh Overlapping RULES


NCC 2022 V1


AS 2870:2011, 5.3.2 (c)

  • Proper Overlap Trench mesh (Mesh A & B)AS 2870:2011, 5.3.2 (c)
  • Acceptable Overlapping
  • ≥ 2 bars staggered overlap
  • Avoids weak spot & distributes load better
  • Unacceptable Overlapping
  • Overlapped exactly on top of each other with matching bar ends & joints
  • Causes stress concentration at one point & can lead to failure

Reinforcement RULES


NCC 2022 V4


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)

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