Clearing Sewer Blockages and Repairing Damaged Underground Drainage Systems
Our team attended a property in Gladesville after a blocked toilet indicated a deeper issue within the sewer system. When toilets back up, it often points to a restriction further down the line rather than a simple fixture issue.
For this project, Pure Plumbing Professionals carried out a full Blocked Drains investigation using CCTV Drain Inspection, followed by high-pressure clearing and excavation works to repair the damaged section of sewer pipe.
This type of job highlights how sewer problems are often a combination of blockage and underlying pipe damage that needs to be properly addressed.
Why Sewer Lines Become Blocked
Sewer systems are designed to carry wastewater away from the property, but they can become restricted over time.
Common causes include:
- Tree root intrusion entering pipe joints
- Build-up of debris and waste
- Cracked or misaligned pipe sections
- Ageing drainage infrastructure
Tree roots are one of the most common causes of recurring sewer blockages. Once they enter the pipe, they continue to grow and trap debris, eventually restricting flow.
This is a common issue in areas like Gladesville where mature trees and older pipework are present.
Using CCTV Drain Inspection to Locate the Problem
To identify the cause of the blockage, our team carried out a CCTV Drain Inspection.
This process involves inserting a specialised camera into the sewer line to:
- Locate the exact position of the blockage
- Assess the internal condition of the pipe
- Identify any structural damage or root intrusion
During inspection, the blockage was located within the sewer line and signs of tree root intrusion were identified.
In some sections, access was limited due to multiple bends in the pipe, which is common in older drainage layouts.
At Pure Plumbing Professionals, CCTV inspections are used to guide both clearing and repair work, ensuring accurate diagnosis before excavation begins.
Clearing the Sewer Line with High-Pressure Jetting
Once the blockage was identified, high-pressure Drain Cleaning was carried out to restore flow.
This method uses water at high pressure to:
- Break apart root masses
- Remove built-up debris
- Flush the line clear
After jetting, all fixtures were tested to confirm that drainage had been temporarily restored.
However, because roots had already entered the pipe, further repair work was required to prevent the issue from returning.
Excavating the Driveway to Access the Sewer Line
To repair the affected section of pipe, excavation was required within the driveway area.
This involved:
- Removing and safely storing pavers for reinstatement
- Cutting through the concrete slab (approx. 120mm thick)
- Using jackhammering equipment to access the pipe
- Excavating a trench to expose the damaged sewer line
Excavation allows direct access to sections of pipe that cannot be repaired internally.
This is often necessary when pipe damage is too severe for non-invasive methods.
Removing and Replacing the Damaged Pipe Section
Once the pipe was exposed, the defective section affected by tree roots was cut out and removed.
Our team then:
- Installed a new PVC junction
- Added an inspection opening for future access
- Reconnected the new section to the existing sewer line
Installing modern PVC pipework improves durability and reduces the likelihood of future root intrusion.
Adding an inspection opening is a key part of professional Sewer Repairs, as it allows future maintenance without additional excavation.
Confirming Repairs with CCTV Inspection
After installation, a second CCTV Drain Inspection was carried out.
This ensured that:
- The new pipework was correctly installed
- There were no remaining defects
- The internal line was clear and free-flowing
CCTV confirmation is an important step in ensuring long-term success of the repair.
Backfilling and Site Reinstatement
Once the repair was complete, the excavation area was reinstated.
This included:
- Backfilling with blue metal aggregate for drainage and support
- Reinstating the concrete slab
- Relaying driveway pavers
Proper backfilling protects the pipe and restores the structural integrity of the surface.
All waste materials were removed, and the site was cleaned upon completion.
What Most Homeowners Don’t Realise About Sewer Blockages
Many homeowners think clearing a blockage solves the problem, but in many cases the underlying issue remains.
Tree roots can:
- Re-enter the pipe if not fully addressed
- Continue to grow within joints
- Cause repeated blockages over time
This is why Blocked Drains often require both clearing and repair.
At Pure Plumbing Professionals, we focus on identifying and fixing the cause, not just the symptom.
When Sewer Repairs and Excavation Are Required
Excavation and pipe replacement are typically required when:
- Tree roots have damaged the pipe structure
- Pipes have collapsed or cracked
- Blockages continue to return after clearing
- CCTV inspections reveal structural defects
Addressing these issues early helps prevent further damage and more extensive repairs.
Drainage Plumbing Services in Gladesville
Properties in Gladesville often require professional drainage services due to ageing infrastructure and tree root intrusion.
The team at Pure Plumbing Professionals provides:
- Blocked Drains clearing
- CCTV Drain Inspection
- Sewer Repairs and pipe replacement
- High-pressure Drain Cleaning
- Complete Drainage Solutions
Each project is completed with a focus on accurate diagnosis and long-term performance.
If you’re experiencing recurring blockages or suspect a problem in your sewer line, a professional inspection can identify the cause and restore proper flow.
Call 0483 915 451 to speak with our team or click Book Now to arrange an inspection.
