Waffle Raft Slab Building Codes & Rules

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

Sand Blinding

Edge Beam

Pier

Waffle Pod

AS 2870:2011, 3.4.1

≤ 1.09m^{AS 2870:2011, 3.4.1}

Vapour Barrier

Finished Concrete Floor Level

Timber Frame

Waffle Pod

AS 3660.1:2014, 4.4

≥ 75^{AS 3660.1:2014, 4.4}

AS 2870:2011, 3.4.2

110^{AS 2870:2011, 3.4.2}

AS 2870:2011, 3.4.1

≥ 300^{AS 2870:2011, 3.4.1}

AS 2870:2011, 3.4.1

20^{AS 2870:2011, 3.4.1}

AS 2870:2011, 3.4.1

D^{AS 2870:2011, 3.4.1}

Masonry Veneer

Loadbearing Wall

Full Sarking

Clad Frame

Flashing

Soil

- copy

Soil

Loadbearing Wall

AS 2870:2011, 3.4.2

150^{AS 2870:2011, 3.4.2}

AS 2870:2011, 3.4.1

≤ 1.09m^{AS 2870:2011, 3.4.1}

≥ 450

AS 2870:2011, 3.4.1

85^{AS 2870:2011, 3.4.1}

AS 2870:2011, 3.4.2

110^{AS 2870:2011, 3.4.2}

Pier

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

Pier RULES

NCC 2022 V1

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)

Footings & Slabs to comply with NCC Part D1H1, 4.2 & AS 2870
Piers added for moderately (M) or highly reactive (H) sites & without Structural Design requirement if^{AS 2870:2011, 3.4.5}
Single storey construction, &
Clad Frame or Masonry Veneer Walls
Placed under intersection at each 3rd internal Beam^{AS 2870:2011, 3.4.5 (a)}
N12 additional Top Bar^{AS 2870:2011, 3.4.5 (b)}
Shear Fitments not mandatory^{AS 2870:2011, 3.4.5 (b)}

AS 2870:2011, 3.4.5 (a)

AS 2870:2011, 3.4.5

For M or H Sites^{AS 2870:2011, 3.4.5 (a)}
Each 3rd internal Beam intersection^{AS 2870:2011, 3.4.5}

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 V3

All Building Classes

NCC 2022, 4.2.10 [2019 3.2.3.1]

May 2023

NCC 2022 HP, 4.2.10

Construction of Footings & Slabs to comply with NCC Part 4.2, AS 2870, & AS 3600
Concrete to AS 3600^{NCC 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

N20 Grade to AS 1379^{NCC 2022 HP, 4.2.10 (a) (i)}
≥ 20 Mpa strength at 28 days^{NCC 2022 HP, 4.2.10 (a) (ii)}
≤ 20mm aggregate size^{NCC 2022 HP, 4.2.10 (a) (iii)}
100mm slump^{NCC 2022 HP, 4.2.10 (c)}
Properly compacted^{AS 2870:2011, 5.3.1}

Masonry Veneer

Concrete Benchmark

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)

Construction of footings and slabs to comply with NCC Section F1D7, Part 4.2 and AS 2870
Material
0.2mm thk Polyethylene Film^{AS 2870:2011, 5.3.3.2 (a)}
Medium impact resistance Vapour Barrier^{AS 2870:2011, 5.3.3.2 (a) (i)}
High impact resistance Damp Proofing Membrane^{AS 2870:2011, 5.3.3.2 (a) (ii)}
Installation
Underlay entire bottom surface of Slab & Beams^{AS 2870:2011, 5.3.3.4 (b)}
≥ 200mm lap at all Joints^{AS 2870:2011, 5.3.3.4 (a)}
Taped or lapped around close-fitting Sleeve of penetrations^{AS 2870:2011, 5.3.3.4 (c)}
Where punctured, fully seal with more Polyethylene film & tape

AS 2870:2011, 5.3.3.3 (c)

AS 2870:2011, 5.3.3.4 (a)

Continuous under Beams & Pods^{AS 2870:2011, 5.3.3.3 (c)}
Turn up to Ground Level at Slab Edges^{AS 2870:2011, 5.3.3.4 (a)}
Protect from & repair any punctures^{AS 2870:2011, 5.3.3.4 (a)}

Reinforcement

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

Chair RULES

NCC 2022 V1

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)

Footings & Slabs must comply with NCC Part 4.2 & AS 2870
≤ 800mm CTS spacing^{NCC 2022 HP, 4.2.11 (7) (e)}
Wire, Concrete, or Plastic^{NCC 2022 HP, 4.2.11 (7) (a)}
Securely connected to Reinforcement^{NCC 2022 HP, 4.2.11 (7) (b)}
Fit Baseplate where required to protect membrane / support^{NCC 2022 HP, 4.2.11 (7) (b)}

Waffle Raft Reinforcement RULES

NCC 2022 V3

All Building Classes

NCC 2022 4.2 [2019 3.2]

May 2023

AS 2870:2011, 3.4.3

Construction of Footings & Slabs to comply with NCC Part 4.2 & AS 2870
Top & bottom Bars of the same size & specification^{AS 2870:2011, 3.4.3}
Waffle Raft Beams with
> 150mm Stem Width, to add Reinforcement according to Table below (Additional Reinforcement)^{AS 2870:2011, 3.4.3}

NCC 2022 HP, 4.2.11 (7) (e)

NCC 2022 HP, 4.2.11 (7) (a)

AS 2870:2011, 3.4.3

≤ 800mm Bar Chair spacing^{NCC 2022 HP, 4.2.11 (7) (e)}
Top & bottom Bars of equal size & specification^{NCC 2022 HP, 4.2.11 (7) (a)}
Fix Ties to prevent movement^{AS 2870:2011, 3.4.3}

Edge Rebate

Concrete Cover

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

Concrete COVER

NCC 2022 V3

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)

Concrete must comply with the NCC
Cover for standard Formwork & compaction as per table^{AS 3600:2018, 4.10.3.2}
Add thickness where cast against ground
Embedded elements must be protected from corrosion or deterioration^{AS 3600:2018, 4.3.1 (c)}

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)

≥ 30mm over membrane^{NCC 2022 HP, 4.2.11 (5) (b)}
≥ 40mm unprotected ground^{NCC 2022 HP, 4.2.11 (5) (a)}
≥ 20mm internal surface^{NCC 2022 HP, 4.2.11 (5) (c)}
≥ 40mm external exposure^{NCC 2022 HP, 4.2.11 (5) (d)}

Termite Management

Where Termite risk is identified
≥ 75mm Wall exposure between ground level & Termite Sheet, to allow visual 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 (a)

NCC 2022 HP, 3.4.3 (b)

NCC 2022 HP, 3.4.3 (c)

NCC 2022 HP, 3.4.3 (d)

Permanently fixed to the Building^{NCC 2022 HP, 3.4.3}
Located conspicuously, such as on a Meter Box or the like^{NCC 2022 HP, 3.4.3}
Must indicate
Termite Management System used^{NCC 2022 HP, 3.4.3 (a)}
Date of installation^{NCC 2022 HP, 3.4.3 (b)}
Life expectancy, as listed on approved label^{NCC 2022 HP, 3.4.3 (c)}
Manufacturer's recommendations of future inspections^{NCC 2022 HP, 3.4.3 (d)}

Termite RISK

NCC 2022 V1

All Building Classes

NCC 2022, H1D3 & 3.4.1 [2019 3.1.4.2]

May 2023

NCC 2022 HP, 3.4.1 (1) (a)

NCC 2022 HP, 3.4.1 (1) (b)

NCC 2022 HP, 3.4.1(2)

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

Termite MANAGEMENT

NCC 2022 V3

All Building Classes

NCC 2022 H1D3 & 3.4.2 [2019 3.1.4.3]

May 2023

NCC 2022 HP, 3.4.2

AS 3660.1:2014, 4.4

Termite Management compliance to the NCC

Inspection Zone^{NCC 2022 HP, 3.4.2AS 3660.1:2014, 4.4}

≥ 75mm exposed Concrete Face
Off form, 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

Where Termite risk is identified
≥ 75mm Wall exposure between ground level & Termite Sheet, to allow visual detection of Termites^{AS 3660.1:2014, 4.4}