Perimeter Drainage Building Codes & Rules

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

Foam Joint

Fall

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Fall

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AS 4654.2:2012, 2.1

Floor Waste

Sump, Inlet Pit, Grate or Cage installed to minimise debris blockage^{AS 4654.2:2012, 2.1}
Install level or below finished floor level

Fulgo Drain

Intermediate Floor Slab

Sleeved Dowel to Engineer's Detail

Fall

Spoon Drain

AS/NZS 3500.3:2021, M.12 (a) (i)

1:60^{AS/NZS 3500.3:2021, M.12 (a) (i)}

AS/NZS 3500.3:2021, M.12 (a) (i)

1:60^{AS/NZS 3500.3:2021, M.12 (a) (i)}

Basement Perimeter Wall

Sealant with Backing Rod

Drain Pipe

AS/NZS 3500.3:2021, 6.3.4

≥ 1:100^{AS/NZS 3500.3:2021, 6.3.4}

Drip Groove

Downpipes

Compatible materials^[1]
Securely attached^[2]
Spacing depending on material^[3]
As close as possible to supporting structure^[4]
Clearance from any electrical, gas pipes & pipeworks^[5]
Access provided^[6]
Clear of any structural elements^[7]

Downpipes INSTALLATION

NCC 2022 V2

All Building Classes

NCC 2022 F1D3, H2D2, H2D6, & Part 7.4

[2019 F1.1, 3.1.3.0 - 3.1.3.1, 3.5.1 - 3.5.5]

May 2023

NCC 2022 Vol 1, F1D3

NCC 2022 Vol 2, H2D2

NCC 2022 Vol 2, H2D6

NCC 2022 HP, 7.4

AS/NZS 3500.3:2021, 4.5.6 (a)

AS/NZS 3500.3:2021, 4.5.6 (b)

Drainage Systems compliance to the NCC^{NCC 2022 Vol 1, F1D3NCC 2022 Vol 2, H2D2NCC 2022 Vol 2, H2D6NCC 2022 HP, 7.4}
Location^{AS/NZS 3500.3:2021, 4.5.6 (a)}
Should not interfere with windows, doors, or any access of the building
As close as possible to supporting structure
≥ 100mm clearance from any electrical or gas pipes
≥ 50mm clearance from any pipework or service
Access^{AS/NZS 3500.3:2021, 4.5.6 (b)}
Provide access for inspection
Installation complying with manufacturer recommendation
Seams and joints watertight
Clear of any structural elements
Not concealed in any dry wall to maintain structural integrity of the wall

Water & Air TESTING

NCC 2022 V3

All Building Classes

NCC 2022 F1D3, H2D2, H2D6, & Part 7.4

[2019 F1.1, 3.1.3.0 - 3.1.3.1, 3.5.1 - 3.5.5]

May 2023

AS/NZS 3500.3:2021, 9.4.1

AS/NZS 3500.3:2021, 9.4.2

NCC 2022 Vol 1, F1D3

NCC 2022 Vol 2, H2D2

NCC 2022 Vol 2, H2D6

NCC 2022 HP, 7.4

Drainage Systems compliance to the NCC^{AS/NZS 3500.3:2021, 9.4.1AS/NZS 3500.3:2021, 9.4.2NCC 2022 Vol 1, F1D3NCC 2022 Vol 2, H2D2}

Water test^{NCC 2022 Vol 2, H2D6}

Head of water ≤ 3m
Seal all openings except the top
Fill with water to the highest level of the section
Maintain water at level
10 minutes for clay drains
5 minutes for other materials

Air test^{NCC 2022 HP, 7.4}

30KPa pressure to the drain for 3 minutes
Measure the time it takes for the pressure to drop from 25KPa to 20KPa

Metal or PVC Pipes PROS & CONS

NCC 2022 V1

Metal pipes
Durable but can corrode over time
UV resistant
Heavy weight
Expensive
PVC Pipes
Light weight
Easier to work with and replaceable
Non-durable since they deform permanently with extreme weather changes
Less costly

Metal or PVC Pipes PROS & CONS

NCC 2022 V1

Metal pipes
Durable but can corrode over time
UV resistant
Heavy weight
Expensive
PVC Pipes
Light weight
Easier to work with and replaceable
Non-durable since they deform permanently with extreme weather changes
Less costly

Metal or PVC Pipes PROS & CONS

NCC 2022 V2

Metal pipes
Durable but can corrode over time
UV resistant
Heavy weight
Expensive
PVC Pipes
Light weight
Easier to work with and replaceable
Non-durable since they deform permanently with extreme weather changes
Less costly

Downpipes SUPPORT

NCC 2022 V3

All Building Classes

NCC 2022 F1D3, H2D2, H2D6, & Part 7.4

[2019 F1.1, 3.1.3.0 - 3.1.3.1, 3.5.1 - 3.5.5]

May 2023

AS/NZS 3500.3:2021, 4.9.6.2

AS/NZS 3500.3:2021, 4.9.2

NCC 2022 Vol 1, F1D3

NCC 2022 Vol 2, H2D2

NCC 2022 Vol 2, H2D6

NCC 2022 HP, 7.4

Drainage Systems compliance to the NCC^{AS/NZS 3500.3:2021, 4.9.6.2AS/NZS 3500.3:2021, 4.9.2NCC 2022 Vol 1, F1D3NCC 2022 Vol 2, H2D2}
System^{NCC 2022 Vol 2, H2D6}
Materials compatible with Roof Drainage System
Securely attached to building structure to prevent movements
No other service attached
protected against corrosion
Spacing^{NCC 2022 HP, 7.4}
≤ 2000mm for aluminium alloys downpipes
≤ 3000mm for cast iron, ductile cast iron, copper, copper alloys, galvanized and stainless steel downpipes
≤ 4000mm for FRC & GRP downpipes
AS 2032 compliant for PVC downpipes
AS 2033 compliant for PE downpipes

AS/NZS 3500.3:2021, 2.2

AS/NZS 3500.3:2021, 4.9.2 (b)

AS/NZS 3500.3:2021, 4.9.6.2

AS/NZS 3500.3:2021, 4.5.6 (a) (iii)

AS/NZS 3500.3:2021, 4.5.6 (b) (iii) (A)

AS/NZS 3500.3:2021, 4.5.6 (d)

AS/NZS 3500.3:2021, 6.2.6

Compatible materials^{AS/NZS 3500.3:2021, 2.2}
Securely attached^{AS/NZS 3500.3:2021, 4.9.2 (b)}
Spacing depending on material^{AS/NZS 3500.3:2021, 4.9.6.2}
As close as possible to supporting structure^{AS/NZS 3500.3:2021, 4.5.6 (a) (iii)}
Clearance from any electrical, gas pipes & pipeworks^{AS/NZS 3500.3:2021, 4.5.6 (b) (iii) (A)}
Access provided^{AS/NZS 3500.3:2021, 4.5.6 (d)}
Clear of any structural elements^{AS/NZS 3500.3:2021, 6.2.6}

Substrate

Smooth, clean, dry & dust free surface^[1]

Substrate PREPARATION

NCC 2022 V3

All Building Classes

NCC 2022 F2D2, S26C3, & HP10.2.9 [2019 F1.7]

May 2023

AS 3740:2021, 4.4.1

NCC 2022 Vol 1, F2D2

NCC 2022 Vol 1, S26C3 (1)

NCC 2022 HP, 10.2.9

Building elements in Wet Areas to be Waterproof or Water Resistant to the NCC^{AS 3740:2021, 4.4.1NCC 2022 Vol 1, F2D2NCC 2022 Vol 1, S26C3 (1)}
All surfaces to be prepared for Waterproofing System adhesion^{NCC 2022 HP, 10.2.9}
Smooth, dust-free, clean & dry surface
Fill voids
Grind smooth any protrusions
Free of formwork deformity
Prime substrate to prohibit pin-holing during the membrane curing process
Moisture test & apply primer as per Manufacturer's Recommendations

Substrate PREPARATION

NCC 2022 V1

Falls formed in the substrate directing water towards FW
≥ 1 : 80 fall to shower area
Class 2 concrete finish
Well compacted
Rounded / arrised / filleted edges
No sharp edges, no back of the shovel finish, no un-vibrated areas

Substrate FALLS

NCC 2022 V2

All Building Classes

NCC 2022 F2D2, S26C3, 10.2.9, & 10.2.12 [2019 F1.7]

May 2023

AS 3740:2021, 2.3.1

AS 3740:2021, 2.3.5

NCC 2022 Vol 1, F2D2

NCC 2022 Vol 1, S26C3 (1)

NCC 2022 HP, 10.2.12

Building elements in Wet Areas to be Waterproof or Water Resistant to the NCC^{AS 3740:2021, 2.3.1AS 3740:2021, 2.3.5NCC 2022 Vol 1, F2D2}
≥ 1 : 100 fall required approaching Floor Waste^{NCC 2022 Vol 1, S26C3 (1)}
≥ 1 : 80 fall required to entire room where Shower unscreened^{NCC 2022 HP, 10.2.12}

Substrate PREPARATION

NCC 2022 V1

Substrate PREPARATION

NCC 2022 V1

Falls formed in the substrate directing water towards FW
≥ 1 : 80 fall to shower area
Class 2 concrete finish
Well compacted
Rounded / arrised / filleted edges
No sharp edges, no back of the shovel finish, no un-vibrated areas

AS 4654.2:2012, 2.5.3.1

Smooth, clean, dry & dust free surface^{AS 4654.2:2012, 2.5.3.1}