Plumbing Connection Winter 2022

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methods to achieve this. An unsuccessful attempt by the
industry and regulators to incorporate design guidelines for
plumbers was made in an earlier amendment of AS 3500.2.
Until now the articulation designs installed under the slab
had been left to the domain of engineers and consultants.
While they have done well to deal with this, it is only with the
publication of AS 3500.2-2021 that there is a clear guideline
on how plumbers can meet the requirements of AS 2870.
Design and installation guidance for plumbing in unstable
and reactive soil now forms part of AS 3500-2 Appendix G,
which provides a set of examples which the plumbing designer
can use directly. It addresses the following:
∫ Soil classifications.
∫ The importance of site preparation and surface water
mitigation.
∫ Protecting moisture ingress via the plumbers’ trench using
clay plugs.
∫ The installation of flexible joints (articulation) when
pipework exits the slab/footing.
∫ Protecting underground structures such as chambers,
tanks, etc.
∫ The installation of flexible joints (articulation) under the
slab.
∫ Articulation for vertical and graded risers.
∫ Applies to both Drainage and Storm Water installations.
Although Appendix G takes its cues from part 5.6 of AS
2870, there are additional details that will take the industry
several steps forward in risk-proofing the drainage system.
Plumbers should be aware of these, as there are additional
steps that they may not have installed in the past. These
include:
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DIAGRAM 2
A second swivel/knuckle joint can help
deliver full articulation.