How Tree Roots Intrude Pipes and What to Do Tree roots don’t usually “attack” pipes on purpose—they respond to conditions. When underground plumbing offers moisture, nutrients, or a pathway through damage, roots can grow toward it, eventually entering via cracks, joints, or aging infrastructure. Root intrusion is a common cause of clogged drains and sewer backups , particularly in older neighborhoods where pipe materials, installation methods, and repair histories vary. Once roots enter, they can snag on surfaces, continue expanding, and further narrow the flow. Why roots target pipes Trees grow toward water, and leaking lines provide a steady supply. Even if the main pipe isn’t actively leaking, damp soil around joints can attract roots. In many cases, a combination of small leaks, condensation, or wet backfill creates a “watering” hotspot underground. Roots also seek oxyge ... Read more »

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