Less Resistant Pipes
Some pipe materials are more resistant to root intrusion than others. Clay tile pipe was commonly installed by developers and private contractors until the late 1980s. This type of pipe is easily penetrated and damaged by tree roots. Concrete pipe and no-corrode pipe may also allow root intrusions to a lesser extent than clay tile pipe.
More Resistant Pipes
PVC pipe is more resistant to root intrusion because it usually has fewer joints. The tightly fitting PVC joints are less likely to leak as a result of settlement of backfill around the pipe.