What Causes Sewer Pipes To Collapse | Network Know How

Network Know How • Feb 02, 2022

Causes Behind A Collapsed Sewer Pipe

A collapsed sewer pipe is no ones friend. The whole point of a sewage system is to help your household wastewater, be it your kitchen sink, bathtub or toilet... to exit your property, ensuring safety and hygiene are maintained. The fundamentals of plumbing essentially.


Having a collapsed sewer pipe is a problem and not one that can fix itself. Unfortunately, by the time the sewer pipe has collapsed, professional intervention from a licensed plumber will be required.


But why has this occurred? Figuring out what may have contributed to the eventual demise of your sewer pipes will help you to figure out firstly, how to tackle the repair and secondly, how to avoid this happening again.                                                                                       

There are several reasons that may lead to the eventual collapse of a sewer pipe, but the two most common factors are...

Network Plumbing tree root and pvc pipe

 Misalignment

Misalignment of your sewer pipes, either through ground movement or ill fitting installation of your sewer drains.

 Foreign Matter

Foreign matter like root systems either entering your sewer system or constraining your sewer pipes to the point of collapse.


A property owner knows the important role your wastewater system plays. When you're suffering from damaged pipes, quick action needs to be taken. A damaged wastewater system is dangerous, and a health risk.


If you are currently experiencing a collapsed sewer pipe... Call Network Plumbing immediately on 9023 3232. Network plumbing has been fixing and replacing broken pipelines for more than 33 years. Our licensed plumbers are fully insured and compliant. Don't risk ill experienced plumbers when dealing with your sewer drain and wastewater.

tree root collapsed pipes

Signs Of A Collapsed Sewer Pipe

A collapsed sewer pipe will present with symptoms, indicating there is a problem lurking beneath the property. If you can identify with any of the below signs, acting before the issue becomes an emergency plumbing situation is advisable.


  • Wet patches in your yard
  • Slow to drain sinks
  • Changes in your toilet flush
  • Smell or odours coming from your drain
  • Gurgling sounds coming from your sinks or toilets
  • Cracks in your driveways or pavers
  • Sunken indentations in your yard


If there are inconsistencies in  the functioning of your drains or toilets, regardless of whether you have recently finished construction on your home or your house is an older, establish home, a collapsed sewers can happen. Paying attention to the symptoms of a collapsed sewer pipe will help you to take action quickly, minimising repair and health risks.


Causes Of A Collapsed Sewer Systems

Our licensed plumbers have pinpointed 5 main causes that may be the culprit of a collapsed sewer pipe. These factors are not necessarily mutually exclusive. Your property could suffer from more than one factor.

Natural movement of the ground

Natural ground movement does occur. Life happens. If your pipes have a poor connection to begin with, just the slightest movement will impact the alignment of your sewer pipes. If the pipes are not connected securely, water can escape and the potential collapse of the sewer pipe is possible.

Ill fitted or misaligned pipes

During the construction phase when the sewer system was installed, if your new pipes at the time where not connected properly or poorly installed, over time wastewater may be able to escape, eventually eroding the soil or ground.


The unsettling of the sub soil structure supporting the pipe often causes misalignment. Over time misaligned pipes will allow wastewater to leak out of the pipe, causing even further erosion of the supporting soil. Without any permanent solution put into place, this misalignment will lead to the pipe collapsing.


There is no time frame around how long this will take to happen, the only certainty is that it will happen.

External Forces

On the rare occasion. External forces can impact your sewer drains. If you are renovating, landscaping or taking on large projects on your property, it is advisable to have a clear understanding of your property's sewer system. This will help avoid potential damage to the existing system, safeguarding yourself, your sewer and stormwater pipelines.

Ages of piping

Older homes carry greater risk. When you purchase an older property, you're also purchasing the plumbing system, of course. What this entails... if there is an existing need for repairs on the sewers like, cast iron pipes suffering from erosion or the eventual breakdown of a terracotta pipe... you'll need to take action.


Age does play a factor. Nothing will last forever. Network Plumbing advises gathering all relevant information, like a CCVT drains inspection to pinpoint any existing issues or potential signs before a collapse occurs.   

Tree roots

A blockage and then the potential collapse of your sewers can be caused by tree roots. Once they enter your system, from even the smallest crack or misalignment, damage will begin. Tree roots will often find their way into the pipe via the rubber ring or concrete joints that are commonly found within the older earthenware pipes.


Although in some cases, these tree roots may only appear to be relatively small inside the pipe, you never know just how big the root system is outside the pipe and what kind of damage they may cause as they continue to grow.


Continual clearing not only creates more water to escape the line... encouraging further misalignment, but the tree root ball on the outside of the pipe also increases in size leading to misalignment, or even worse may cause the pipe to break and collapse. Once this stage is reached the only solution is to dig and replace the effected sewers.


The Dangers Of Broken Sewage Systems

A collapsed sewer pipe carries with it health risks as well as increasing the amount of repairs required.


Dealing with a collapsed sewer pipe means, all the waste water including sewage that should be exiting your property may not be doing that at all. Sewage may contain microorganisms... viruses and bacteria. While also creating a perfect environment for mould, mildew and wet patches in your yard. A continual wet patch could result in indentations in your yard, leading to potential trip hazards.


The longer waste water is escaping your sewer system, the more damage is being done. Not just water damage but also the knock on effect of an unresolved plumbing issue. If you're dealing with say, tree roots... the tree will continue to grow even after the sewer pipe has collapsed... potentially effecting other sections of your plumbing system.

network plumbing | sewer pipe and tree root

How To Protect Your Sewage System

Information

Knowledge is power. Knowing where your sewer waste system is and where it connects to your sewer main is power. If works or construction are untaken on your property, you'll know the areas to avoid. If you notice a wet patch that lines up with your sewer pipe plan, you'll have a pretty good indication that an issue is at play with your sewers.


As a property owner, do you know what your pipes are made out of and the associated risks? From cast iron, copper, terracotta to pvc. Pipe materials factors in.

Licensed Plumber

Always use a licensed and reputable plumber. Plumbing is a fundamental part of your home. Be selective when you enlist a plumber to perform works on your property. When you deal with a reputable plumbing company like Network Plumbing, you're in safe hands. We value our plumbing works and our clients.

Regular Maintenance Plan

Enlisting a regular maintenance plumbing plan will help you to identify issues before they become major problems. Read more about our Spring Maintenance Plumbing Tips (this can be done at any point in time).


plumber doing a dig up

Is A PVC Pipe A Good Replacement Pipe?

Yes, when a sewer pipe is in need of being replaced, here at Network Plumbing we use the highest quality PVC on the market. PVC is lightweight and easy to handle, making the process less time consuming than it might otherwise be.


As PVC pipes are available in longer continuous lengths than your traditional pipes like terracotta... there will be less joints throughout the replaced section laid. PVC can also accomodate fitting into a terracotta piped section.

What Is The Solution For A Collapsed Sewer Pipe?

Network Plumbing can assist with your collapsed sewer pipe. Once the sewer pipe has been identified as collapsed, the only solution is to dig and replace the damaged section. Unfortunately, with no structural integrity left in the old pipe, a replacement pipe is needed.


Network Plumbing are ready to help replace your collapsed sewer pipes contact us today.


We're also ready to help with plumbing maintenance in the future to help avoid this occurring further down the line.

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