When a crack appears in a wall, a drain slows or a driveway lifts, a nearby tree is the first suspect. Sometimes it is guilty, and often it is not. This guide explains what tree roots can and cannot do, how to find out whether a tree is really the problem and what to do before anyone reaches for a chainsaw.
What roots can and cannot do
Tree roots are generally not strong enough to crush a foundation or a sewer pipe. Where trees affect buildings, it is mostly in two ways: roots can grow under a shallow foundation or slab and lift it, or they can pull water out of the soil, which in clay soils makes the ground shrink. Clay soils can also shrink on their own in dry weather, so a cracked foundation near a tree does not prove the tree caused it. A Montreal nature agency makes a similar point: trees do not usually cause foundation problems, and prolonged summer dry spells that dry out clay are the main culprit.
Sewer lines
Sewer problems are a different story. A University of Georgia horticulturist notes that the damage he typically sees is roots that grow alongside a pipe and thicken with age, pressing on joints and causing leaks, and that if there is a leak, roots can enter the pipe. University of Missouri Extension calls silver maple notorious for plugging sewer lines and lifting sidewalks. Warning signs include slow drains, gurgling and repeated clogs. A plumber can run a camera through the line to see what is in it.
How far roots spread
Roots spread far beyond the canopy, mostly in the top foot or so of soil. Some forestry engineers say the root systems of certain species can reach two or three times the tree’s height. That is why a tree you think is far from the house can still be in the same soil as the foundation, the sewer lateral and the driveway.
Driveways, sidewalks and patios
Shallow, fast-growing trees are the usual culprits for lifted pavement. Surface roots thicken each year and raise the slab above them. Options include shaving or grinding a raised edge, installing a ramp, replacing the pavement with a different design that goes around roots and, in some cases, removing the tree. Cutting a large root to fix a sidewalk can harm or destabilize the tree, so talk to an arborist first.
Find out before you cut
- For foundation cracks: ask a structural engineer or foundation specialist what is causing them, including whether the soil is shrinking and swelling.
- For drains: have a plumber camera the line and confirm roots are in it.
- For the tree: ask a consulting arborist or a certified arborist about the species, size and distance.
Cutting down a healthy tree that was not the cause removes shade and value and may not fix the problem.
Cutting roots safely
Do not cut large roots near the trunk. They hold the tree up and take up most of the water. If roots must be cut, an arborist can advise on how far from the trunk, how many and how to protect the tree afterward. Call 811 before digging, since roots and utility lines often share the same ground. See tree trimming in Salina KS and hazardous tree assessment in Salina KS.
Protecting your foundation, pipes and pavement
- Plant new trees well away from the house, sewer lateral and pavement, based on their mature size.
- Water trees deeply at the drip line, so roots are not forced to hunt for water near the house.
- Consider root barriers when you plant near pavement.
- Avoid species known for aggressive or shallow roots near buildings and pipes.
Weak roots and storm failure
Roots matter for stability too. A tree with damaged or decayed roots can fall in wind even if the crown looks healthy. On June 8, 2026, a 113 mph gust at Salina Airport brought down trees across the city, and lifted soil at the base of a tree is a warning sign. See leaning or split tree in Salina KS and drought-stressed trees in Salina KS.
Common questions about tree roots
How close is too close for a tree near a house?
There is no single number, because it depends on the species, its mature size and the soil. Large trees need far more room than small ones. An arborist can advise for your yard.
Should I cut down a tree if my foundation is cracking?
Not before you know the cause. Get an engineer or foundation specialist to diagnose it first. The soil may be drying and shrinking regardless of the tree.
Can I put a root barrier in myself?
Barriers are easiest to install when planting a new tree. Putting one in near an established tree can cut roots, so ask an arborist before trying it.
Need a tree looked at in Salina KS?
If you want a professional opinion, request a free tree service quote in Salina KS. Describe the tree, where it stands and what worries you, and send photos if you can. Print the tree check checklist for Salina KS homeowners to walk your property first, or read the tree service FAQ for Salina KS.
