Tree Root Barrier - 30 inch - Standard DutyTree Root Barrier 30 Heavy Duty Maximum protection for large trees and critical infrastructurewhen deeper is better. Why It Works Engineered from 80 mil (2 mm) recycled HDPE with proven 155 lb puncture strength (ASTM D 4833)perfect for large mature trees like oak, maple, and pine. At 30 deep, this barrier provides superior root control, redirecting even aggressive root systems away from critical infrastructure. The flexible, continuous roll design