Concrete Slab Edge Rebate Building Codes & Rules

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

Earth

AS 2870:2011, 5.3.4

NCC 2022 HP, 4.2.9 (a)

≥ 20^{AS 2870:2011, 5.3.4NCC 2022 HP, 4.2.9 (a)}

Vapour Barrier

Earth

Edge Beam

Flashing

AS 3700:2018, 4.7.2

Weepholes

1.2m CTS Intervals^{AS 3700:2018, 4.7.2}

Sand Blinding

Vapour Barrier

Sand Blinding

Termite Sheet

Sand Blinding

Edge Rebate

AS 2870:2011, 5.3.4 (b)

≥ 150 to 200^{AS 2870:2011, 5.3.4 (b)}

AS 2870:2011, 5.3.4 (f)

> 400^{AS 2870:2011, 5.3.4 (f)}

AS 2870:2011, 5.3.4 (c)

≥ 150^{AS 2870:2011, 5.3.4 (c)}

DPC /

Flashing

Termite Sheet

- copy

Finished Ground

DPC /

Flashing

- copy

Bonded Zone

Fitment req'd

Edge Rebate

- copy

Finished Ground

AS 2870:2011, 5.3.4

External Wall^{AS 2870:2011, 5.3.4}

Masonry Cavity
Veneer Construction

AS 3660.1:2014, 5.3.8.2

≥ 35^{AS 3660.1:2014, 5.3.8.2}

AS 3660.1:2014, 5.3.8.2

≥ 35^{AS 3660.1:2014, 5.3.8.2}

AS 2870:2011, 5.3.4 (b)

Fitments^{AS 2870:2011, 5.3.4 (b)}

Allow reduction in horizontal thickness
R10 or N10 Cranked Bar
≤ 900mm spacing
≥ 200mm thk not required

AS 2870:2011, 5.3.4

External Wall^{AS 2870:2011, 5.3.4}

Masonry Cavity
Veneer Construction

AS 3660.1:2014, 4.4

Termite Management^{AS 3660.1:2014, 4.4}

≥ 75mm exposed Face
Sheet or Granular system

AS 3660.1:2014, 4.4

≥ 75^{AS 3660.1:2014, 4.4}

AS 3660.1:2014, 4.4

Termite Management^{AS 3660.1:2014, 4.4}

≥ 75mm exposed Face
Sheet or Granular system

AS 2870:2011, 5.3.4

External Wall^{AS 2870:2011, 5.3.4}

Masonry Cavity
Veneer Construction

AS 3660.1:2014, 4.4

≥ 75^{AS 3660.1:2014, 4.4}

AS 2870:2011, 5.3.4 (c)

≥ 150^{AS 2870:2011, 5.3.4 (c)}

AS 2870:2011, 5.3.4

≥ 50^{AS 2870:2011, 5.3.4}

AS 3660.1:2014, 4.4

≥ 75^{AS 3660.1:2014, 4.4}

AS 2870:2011, 5.3.4 (f)

≥ 200^{AS 2870:2011, 5.3.4 (f)}

AS 2870:2011, 5.3.4 (b)

≥ 150

400^{AS 2870:2011, 5.3.4 (b)}

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}

Vapour Barrier

Continuous under Beams & Waffle 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 & Waffle 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)}

Concrete Benchmark

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

AS 2870:2011, 5.3.1

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)

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

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)}