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The Complete Guide to Sewer Backups: Causes & Fixes The sewage system may not be the most appealing feature of your property, but it is one of the most essential! The network of pipes and drains through which wastewater and solid waste leave your home and enter the main sewer is vital to your health and comfort. A common sewage network problem is a sewer backup. This is when some type of blockage prevents the flow of drainage material into the main sewer. Here we consider in more detail the causes and symptoms of sewer backups, as well as how best to fix the issue and prevent it from happening again. Causes of a Sewer Backup Sewer Pipe Condition Over time, sewage pipes inevitably start to deteriorate. Some of the variables that accelerate pipe wear include: • Weathering due to daily and seasonal temperature changes in the soil surrounding the pipe. • Changes to the soil volume and consistency surrounding the pipe. • Subsidence or soil movement causes a change in the gradient or direction of the pipe. • Erosion as a result of the action of tree or shrub roots. • Animal activity. • Pressure, vibration, or other stress due to work carried out in the property or soil surrounding the pipe – building an extension, for example, or landscaping projects, may all cause damaging stresses to be applied. The pipe's interior may also wear more rapidly if unsuitable or high volumes of waste are disposed of over time. Chemicals or hard, sharp-edged items can cause damage to the...