Pipe Lining Denver. There is a growing market for pipe lining in Denver. Pipe lining is the most popular method of trenchless pipe rehabilitation and continues to grow in the Denver area. The older Denver neighborhoods experience heavy root intrusion between the joints of their clay pipes. Pipe lining is a permanent solution as the Perma-Liner materials are jointless and seamless making it impenetrable to roots! If you live in the Denver area and are interested in becoming a pipe lining installer or need pipe lining installed on your Denver property, please call Perma-Liner.