Tree roots are naturally attracted to the moisture inside a drainage pipe. If you use perforated corrugated pipe, the roots will find the holes and fill the pipe in months. At Basement Expert, we manage root intrusion by using solid PVC with precisely drilled holes and wrapping the entire system in a high-grade geotextile filter fabric. This fabric allows water in but keeps silt and roots out, ensuring your exterior drainage remains clear for decades in the lush Seattle landscape.