Blocked drains can be caused by unsuitable material, deposits, roots or defects in the pipe itself. Recurring problems often involve more than one factor. A damaged joint, for example, can catch wipes or solids that would otherwise pass through an intact pipe.
What Causes Blocked Drains
Blocked drains can be caused by unsuitable material, deposits, roots or defects in the pipe itself.
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Deposits and defects
A damaged joint or root entry can catch ordinary waste and turn a minor restriction into a recurring blockage.
Prevention
Disposal advice helps with avoidable material, but it cannot replace repair where the pipe itself is defective.
When deposits and pipe defects combine
Grease, scale or silt can narrow the bore, while displaced joints and root entry create places for material to collect. Clearing the immediate blockage may therefore restore flow without removing the condition that caused it to return.
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Preventing avoidable blockages
Wipes and sanitary products should be put in the bin, and cooking fats should not be poured into sinks. Hot water does not make grease disposal safe because fats cool and can accumulate further along the drain.
What the removed material can tell you
The material found during clearance can help explain the blockage, but it does not always show why it lodged at that point. If the same section repeatedly blocks, cleaning or camera inspection may be needed to look at the surrounding pipe condition.
What Causes Blocked Drains: common questions
Are wipes safe to flush if the label says flushable?
Water-company advice is to put wipes in the bin, including products marketed as flushable.
Will hot water stop grease blocking the drain?
No. Fats can cool and accumulate further along the pipe.
Can damaged pipework cause repeated blockages?
Yes. Displaced joints, root entry and other defects can catch material at the same point.
Can roots trap other waste behind them?
Yes. Root growth can narrow the bore and collect other material.
Can one blockage have more than one cause?
Yes. Deposits can combine with a displaced joint, root entry or another defect that catches material.