All Building Classes
NCC 2022 F2D2, S26C3, 10.2.9, & 10.2.12 [2019 F1.7]
May 2023
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)
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
Water testNCC 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 testNCC 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 NCCAS/NZS 3500.3:2021, 4.9.6.2AS/NZS 3500.3:2021, 4.9.2NCC 2022 Vol 1, F1D3NCC 2022 Vol 2, H2D2
- SystemNCC 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
- SpacingNCC 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