Sewer Encasements: Encasing a pipe in concrete to provide strength and protection

When building over the zone of influence of an existing sewer, a concrete encasement is a very common requirement of the Section 73 Compliance Certificate.

Encasing a pipe in concrete will provide strength to the existing asset and will provide additional protection to the pipe from unexpected external load and movement, reducing the risk of damage and consequently the need for repairs.

A lot of the existing sewer mains and pipelines around Sydney are made of clay or cast iron, and it is generally recommended that these or any deteriorating pipes, be removed and replaced with PVC pipe. The PVC pipe is then surrounded in concrete to create the sewer encasement.

Permanent or temporary building works that may adversely impact the sewer main and usually require an encasement include residential, commercial and industrial works such as:

  • Swimming pools and water tanks
  • Carports, verandahs, pergolas, and sheds
  • Decks and retaining walls
  • Driveways and pavement areas
  • Planting trees and landscaping
  • Demolition and excavation
  • Roads and civil infrastructure
We are a Sydney Water Listed Provider

All Line Plumbing are Sydney Water accredited and can provide you with sewer encasements throughout Sydney. We are also Hunter Water accredited and offer our sewer encasement services throughout the Hunter region.

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Sewer Encasements

Sewer Encasements

Sewer Encasement Process

Before you can receive a Section 73 Compliance Certificate, you will need to adhere to the Sydney Water requirements, and these may include the need for a sewer encasement. All Line Plumbing will usually liaise with a Water Servicing Coordinator (WSC) or engineer and install an approved design. The most common sewer encasement process is:

  1. Excavate the pipe
  2. Renew or replace the pipe with PVC
  3. Secure and support the underside of the pipe using concrete bags or blocks
  4. Secure and strap down the top of the pipe with timbers so the pipe does not float while installing the concrete
  5. Inspection and approval by the WSC or engineer
  6. Pour concrete per the design of the WSC or engineer
  7. Backfill and compact trench as required

Sewer Encasements

What is a Service Protection Report?

A service protection report (also commonly known as a pegout) identifies and precisely locates Sydney Water assets (such as sewer and water mains) which may be in close proximity to the proposed development. Only Sydney Water accredited personnel like All Line Plumbing, can prepare these reports for you.

Are you building a swimming pool, a deck, a granny flat, excavating property or developing over or near a sewer main in Sydney?

The sewer infrastructure in and around Sydney are an asset owned by Sydney Water and it is their responsibility to ensure that these sewer pipes are protected against any kind of damage.

More: Service Protection Reports (Pegouts)

We offer a Sydney and Hunter wide plumbing service

Please feel free to contact us if you do not find your region listed below.

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Shane Hughes
0414 252 681

Michael Furlan
0423 009 869

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