4 Things You Need to Know
Worried that tree roots might crack your foundation? You’re not alone—and you’re not entirely wrong, either. But the relationship between trees and foundations is more complex than most homeowners think. In this post, we’ll clear up the myths, explain what really causes damage, and share expert tips to keep your trees—and your home—safe.
Do Tree Roots Really Damage Foundations?
The short answer: Not directly—at least, not most of the time.
Contrary to popular belief, tree roots don’t have the power to drill through solid concrete. What they can do is exploit existing weaknesses. More commonly, roots cause indirect damage by affecting the soil beneath your home.
Here’s how:
- In expansive clay soils, roots draw out moisture, causing the ground to shrink and shift.
- Uneven soil movement can lead to foundation settling or cracking.
- In rare cases, large roots can lift or heave walkways or shallow slabs.
- Warning Signs of Root-Related Foundation Problems
Not every crack is caused by roots—but these signs are worth watching:
- New or widening cracks in walls or the foundation
- Uneven or sloping floors
- Windows and doors that suddenly stick
- Visible tree roots growing close to the house (within 10 feet)
2. Trees That Pose the Highest Risk
Some tree species are more aggressive than others when it comes to root spread and moisture demands. Trees to be cautious with near foundations include:
- Willows
- Poplars
- Maples
- Elms
- Katsuras
These species have fast-growing, invasive root systems that can stretch far beyond the canopy.
3. How to Prevent Foundation Damage from Trees
Prevention is key—and the right decisions early on can save you thousands later. Here’s how to protect your home:
Choose the right species for your soil and lot size
Plant at the right distance—at least 15 to 20 feet from structures
Install root barriers during planting or retroactively to redirect roots
Have your trees professionally assessed every few years
Manage Irrigation: Shallow irrigation encourages tree roots to grow near the soil surface, where water is consistently available. These surface roots can extract moisture from the soil beneath and around home foundations—especially in clay soils—causing shrinkage and uneven settling. This can lead to foundation cracks, wall damage, and uneven floors. Additionally, roots can enter existing cracks or disrupt compacted soils beneath foundations. Deep, infrequent watering and proper tree placement help reduce these risks.
4. What to Do If You’re Concerned
If you’re already seeing cracks or have large trees planted near your home, don’t panic—and don’t remove the tree just yet.
Here’s what we recommend:
- Get a tree risk assessment from an ISA Certified Arborist
- Consider a soil test or foundation inspection
- Look into root pruning or non-invasive barrier installation
Every situation is different, and a professional evaluation is the best way to avoid unnecessary damage—or unnecessary removals.
Need Help? Call the Experts.
At Sperry Tree Care, we’ve been helping homeowners in Lane and Benton Counties care for their trees—and protect their homes—since 1990. As ISA Certified Arborists and the only TCIA-Accredited tree company in Lane County, we’re uniquely qualified to diagnose root-related issues and recommend the safest, most cost-effective solution.
