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How tree roots get into pipes #3
Tree roots grow into cracks in the joints of sewer pipes that may have been there even before the pipes were used.
Hard to believe but envisage this.
Your friendly plumber has dug a trench, laid the new earthenware pipes, cemented all the joints, then proceeded to back fill the trench.
The very process of backfilling the trench is enough to put pressure and fine cracks in the cement joints.
That is just enough to let the tree roots know that warm condensation is nearby.