Drain Damage Los Angeles. An older Los Angeles home had extensive damage from roots in their drain line. Over years and years of ground movement, the clay drain pipes had cracked and broken allowing roots to enter. The Perma-Liner products are used widely in Los Angeles and all over California, so the homeowner was familiar with the Perma-Lateral process. The only question the homeowner had was regarding the size difference of the drain pipe once the Perma-Lateral liner material was installed. Great question that we receive quite often! Although the Perma-Lateral material is 3mm thick, the flow rate is actually increased (3rd party tested) due to the liner being seamless and jointless from beginning to end. If you live in Los Angeles, fix your damaged drain pipes now!