Blocking Neighbor's Tree Roots from Foundation

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Root Barriers: Trifluralin-impregnated fabric (Biobarrier) installed in trench—stops roots without killing tree.
Cut & Treat: Dig trench at property line, cut roots, paint cuts with glyphosate (Roundup). Kills roots on your side; may cause minor canopy dieback.

Rock salt damages soil, kills desirable plants, and may not stop roots effectively.

Trees: Dealing with Tree Roots in the Lawn: Removal and Prevention; Tree Roots Lifting Pavers: Switch to Gravel or Raise Patio; Ash Tree Surface Roots: Cover, Don't Cut; Mystery Blob at Mulberry Base: Fungus or Harmless Slime Mold?; West Indies Mahogany Surface Roots Near Sidewalk: Root Barriers Better Than Cutting; Cottonwood Tree Too Close to House: Root Damage Risks; Neighbor's Cypress Roots Damaging Driveway and Foundation; Willows Yellowing in NM Drought: Water, Not Ants; Willow 25 m from House: No Subsidence Risk; Grinding Cottonwood Surface Roots: A Risk to Tree Stability

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