Massive Maple Roots at the Foundation: Real Risk or Not?

Old Maple 12 Feet from House: Roots Touching the Foundation

A huge, old maple (partly on city property) has visible surface roots touching the house base. The district arborist says no foundation risk, but the owner doubts it and worries about pipes.

Expert Perspective

• Roots spread 1.5x branch width. Large roots can damage slab foundations; crawl-space foundations are less vulnerable.
• An old tree's roots have likely adapted and turned away from the foundation.
• Water pipes are sealed—roots can't penetrate unless there's a leak.
• Septic lines (unsealed) are at risk.
• Prune limbs that rub the house; that's the more immediate hazard.

The arborist is likely correct, but keep limbs off the structure.