#1 · SEATTLE
Sewer pipe lining (CIPP) builds a new structural pipe inside your existing one — a resin liner cured in place, no digging along the run. It's the go-to when a line is cracked or root-damaged but still holds its shape.
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Modern CIPP liners carry 50-year design lives and effectively become the pipe. The catch is candidacy: collapsed or badly deformed hosts can't be lined.
By a few millimeters — hydraulically insignificant, and the new smooth wall usually flows better than the rough old pipe it replaced.
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