Liquidambar Root Threat to Neighbor’s Foundation: Assess Distance

Root Spread vs. Foundation Risk

Mature liquidambar (sweetgum): 60–75 ft tall, 40–50 ft spread. Roots extend 1.5× branch spread.

Risk Factors

• Slab foundation within branch spread = high risk.
• Crawl space = low risk (outer roots are small).
• Your house closer than neighbor’s but no damage suggests soil/structure differences.

Next Step

Hire a consulting arborist or state forester for on‑site evaluation. Root barriers (Biobarrier®) can be installed at property line if needed.