Tree roots naturally seek out moisture, and underground drainage pipes are an ideal source. When tiny root tips enter through small cracks or joints, they quickly expand inside the pipe, forming a dense mass that blocks the flow of water. This process can happen silently over several months or even years.
In London’s suburban areas-where mature trees are common-root ingress is one of the most frequent causes of drain blockages. CCTV surveys help identify root entry points early, and once removed, the affected pipe can often be relined rather than fully replaced. This modern method avoids excavation and restores the pipe to full working order.
