Blocked drains are often caused by a buildup of foreign objects, materials, or substances in your drain pipes. Some common causes include: tree roots, silt, grease and fat.
In broken pipes the water cannot flow freely and it may collapse, causing the drain to block. The most common causes of broken pipes are poor installation, age, tree roots and DIY attempts to clear a blockage.
Over time, wear and tear to ageing pipes will begin to increase and get worse. If nothing is done to repair the system, this can lead to the drain collapsing.
Pipes can collapse due to freezing temperatures, frequent blockages, subsidence, leaking or poor maintenance. When a pipe collapses, wastewater can't leave the property and seeps out into the surrounding areas.
Tree roots are naturally drawn to the moisture in drainage pipes, another common blocked drain cause. Over time, they can grow and expand, causing blockages and even breaking the pipes.
Leaking drainage systems can lead to subsidence by washing away the soil that supports your home's foundations, weakening the structure leading to cracks in walls, extentions pulling away from the original structure or the property leaning to one side.