The gully next to the stack was back flowing with toilet waste
A CCTV camera was sent down the access point to establish why it had blocked.
Jetting & CCTV cameras were deployed to detect the cause of the blockage.
Our customer had observed the gully next to the stack back flowing with toilet waste. However, there was no manhole, so an access point had to be cut into the cast iron stack and jetted through to clear the pipe.
This wasnt completely successful so we jetted again and a camera was sent down the access point to establish why it had reblocked. The camera located & identified the issue and the client agreed for a repair to remedy the situation.
- We identified the location
- Excavation was carried out to gain access.
- A full repair was undertaken
- Backfill to level and then apply a concrete surface to reinstate.
Collapsed Drain: Causes, Signs, and Repairs
A collapsed drain occurs when a drainage pipe (usually underground) loses its structural integrity, causing it to crack, break, or completely cave in. This can lead to blockages, sewage backups, and even property damage if left untreated.
Common Causes of a Collapsed Drain in the UK
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Age & Material Degradation
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Older drains (e.g., clay or cast iron pipes) are prone to cracking and collapse over time due to wear and corrosion.
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Modern plastic (PVC) pipes are more durable but can still fail if poorly installed.
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Ground Movement & Subsidence
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Shifting soil, tree root intrusion, or heavy construction work near drains can cause pipes to crack or collapse.
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Clay soils (common in parts of the UK) expand and contract with moisture changes, increasing pressure on pipes.
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Heavy Loads & Traffic
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Drains under driveways or roads may collapse due to constant vehicle weight, especially if they were not reinforced properly.
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Blockages & Water Pressure
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Persistent blockages (e.g., fat buildup, debris) can increase pressure inside pipes, leading to cracks or collapses.
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Freezing temperatures in winter can cause water inside pipes to expand, weakening them.
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Poor Installation or DIY Repairs
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Incorrect pipe alignment, weak joints, or substandard materials can lead to premature failure.
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Signs of a Collapsed Drain
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Slow drainage or frequent blockages in sinks, toilets, or showers.
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Sewage smells in the garden or near drains.
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Sinkholes or depressions in the ground above the drain.
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Damp patches or mould inside the property (if the leak is under the house).
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Unusual noises (gurgling) from drains when flushing toilets.
How to Fix a Collapsed Drain
1. Professional Inspection (CCTV Survey)
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A drainage specialist will use a CCTV drain camera to locate the exact point of collapse and assess damage.
2. Repair Options
Depending on the severity, repairs may include:
a) Patch Repairs (Minor Damage)
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Resin Lining (Cured-in-Place Pipe – CIPP): A flexible liner coated with resin is inserted and hardened to seal cracks.
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Pipe Relining: A new pipe lining is inserted inside the old one without excavation.
b) Excavation & Replacement (Severe Collapse)
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If the pipe is completely crushed, digging and replacing the damaged section is necessary.
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Trenchless methods (e.g., pipe bursting) may be used to minimise disruption.
c) Drain Rerouting (If Pipe is Beyond Repair)
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In extreme cases, a new drainage line may need to be installed.
3. Prevention Measures
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Regular CCTV checks (especially for older properties).
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Avoid planting trees near drainage lines.
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Proper waste disposal (no fats, wipes, or non-flushable items).
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Reinforce weak pipes before they fail.
Who is Responsible?
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Homeowners: Responsible for drains within their property boundary.
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Water Companies (UK): Responsible for shared sewers (usually outside the property boundary).
If you suspect a collapsed drain, contact Yorkshire Drains for an assessment. Ignoring it can lead to costly structural damage or environmental hazards.