Your trees look great, but their roots may be causing damage to your foundation
Tree roots are always looking for water and nutrition.
Tree roots dry out the soil and cause it to shift.
Shifting soil can cause foundation cracks.
If tree roots interfere with your plumbing line, it can cause damage.
Few things add to curb appeal like a haven of lush trees in your yard. Though beautiful, trees can cause foundation damage if they’re close to your home due to their roots. But don’t worry. With the proper knowledge, you can be ready to spot and address any root-related issues before they become a bigger problem. Read on for what to know about tree roots that could cause damage to your home’s foundation and what to do about it.
Tree roots can cause damage to your foundation either directly or indirectly. Direct damage occurs when the tree roots infringe on the foundation itself, resulting in lifting or cracking. Indirect damage occurs when they grow or by changing soil conditions around and under the foundation. Typically, roots grow horizontally, not far beneath the soil surface. When roots encounter solid surfaces such as pipes, sidewalks, curbs, and foundations, they start growing down.
However, if there is a crack nearby (think leaky plumbing pipes), tree roots will exploit those voids, searching for water and nutrition. They can also displace the soil around them, causing the soil to shift and put tremendous pressure on your home’s foundation.
“We worked on a house that had standing water in the back corner of the yard and decided to plant a water-thirsty willow tree there as a way to soak it up naturally,” says Robert Tschudi, Expert Review Board member and North Carolina-based homebuilder and remodeler. “But as the tree grew, its roots reached out and found the septic system and eventually destroyed it. Now, we look for non-invasive trees and shrubs.”
Oaks, poplars, and ash trees are all prone to causing foundation damage if they’re planted close enough. They share a common trait: shallow, fast-growing roots, which can wreak havoc on a foundation if left untreated. Some other trees that can damage foundations include:
Sycamore
Silver maples
Honey locusts
Boxelder
Norway spruce
Crimean Pine
Sweetgum
Foundational problems result from tree roots sucking up water. Even the smallest roots can turn ruthless if they’re constantly reaching for hydration and nutrients. Here’s a look at some of the specific structural damage that tree roots can inflict.
Since the foundation depends on the surrounding soil for support to keep it stable, when roots grow larger or draw out moisture levels in the soil, the foundation starts settling, leaving the foundation unsupported.
Weather can also factor in the foundational damage. Roots can shrink during droughts if clay soil dehydrates, and they can expand by absorbing water during periods of heavy rain. These fluctuations can damage land structure by creating gaps below the surface.
When soil shifts, support beams shift, walls crack, and ceilings become uneven. Although concrete settling is not always a hazard, it can cause basic structural damage in older homes.
In their search for water, roots may go after your home sewer line if there are any leaks. When roots find hairline cracks in the plumbing line, they may grow into your plumbing to access the flow of water and nutrients.
There are a few telltale signs that tree roots are threatening your foundation. Here are some things to watch for.
You’ll notice cracks running across your foundation floor and walls, especially on the side that receives the most sunlight. “Having the wrong tree can ruin not only foundations but patios and even asphalt pavement,” says Tschudi. “It’s important to identify every tree and shrub on your property and find out how they affect the surrounding landscape and structures.”
You may also notice that your house leans toward a tree because the tree draws moisture out of the soil, making space for the foundation to shift or collapse.
When concrete sidewalks or pavers crack, the roots will find their way to allow pieces of the sidewalk to stick up and buckle, which may create a tripping hazard.
You may experience signs of a faulty plumbing system, such as clogged drains that don’t clear with a plunger, drain cleaner, or other treatments or changes in water pressure.
Removing a tree is often a necessary step to halt the damage being done to your foundation by the tree’s roots. You may wonder, however, if removing the tree can cause problems of its own. While removing the tree is usually the best course of action, there are a few issues that removal may cause.
In homes built on or adjacent to sloping ground, removing a tree can potentially speed up soil erosion in the area. Tree roots often provide support and structure on sloped ground, and without those roots, the soil may erode.
When a tree is removed, water that had previously been directed to the roots will now be retained in the soil. This is usually a desired result, as it helps restore soil height. But it can also cause more standing water that runs the risk of entering your foundation through the cracks caused by the roots.
If you want to keep the benefits of trees without sacrificing the foundation of your home, there are a few things you can do to prevent roots from damaging your foundation outside of just hiring someone who inspects foundations.
Avoid planting any tree closer than 10 feet from a home’s foundation as a rule of thumb. Also, avoid planting invasive trees, but if you have to, they shouldn’t be closer than 25 to 50 feet away from your foundation.
Before planting trees, install foundation barriers that can deflect roots deeper into the ground and away from foundations, pavement, and plumbing. Usually, they consist of overlapping sheets of plastic that help divert roots away from the foundation.
When picking trees to plant around your home, you must pick slow-growing trees that don’t have an invasive root system.
Avoid planting trees such as willow, elm, or silver maples unless you have a large yard. Opt for manageable-sized trees that will provide shade without compromising your foundation, such as olive trees, English holly, or Australian willow.
If you keep any trees near your home properly watered, there’s little chance of them creating problems.
While it’s important that water drains from your foundation, it’s equally important to maintain soil moisture to combat soil shrinkage consistently. Regularly watering trees within 20 to 30 feet of your house using a drip hose will add moisture slowly and ensure even hydration.
Fortunately, there are ways to repair your home’s foundation if tree roots have wreaked havoc. Here’s what to do.
In many cases, you don’t have to kill your tree if it grows into your foundation or sewer system. Instead, call a tree-trimming expert to inspect and maybe remove a portion of the tree that caused the damage.
Suppose you’ve noticed cracks or damage in your foundation or are worried about the tree roots surrounding your home. In that case, you may want to consult a local foundation repair professional to examine your property, foundation, and any potential damage.
A leaky plumbing drain can leak water into the soil, giving tree roots a source of moisture. Roots can enter and block drains with poor joints or seals. If a tree root damages your plumbing system, call a plumber to replace the pipe and install root barriers to prevent more damage.
Though it can be hard to part with a beautiful tree, sometimes, it’s the best option. If preventive methods fail, removing the tree and the root system would be the last resort to protect your foundation. For this job it’s best to call a local tree removal expert since tree removal can be dangerous and might cause damage to your property.
Tree roots don’t necessarily break through concrete on their own, but they can certainly take advantage of existing cracks, even very small ones. As roots grow, they expand the cracks, making them larger and leading to serious and costly foundation damage. It’s a good idea to have repairs on any foundation cracks you’re concerned about.
In general, trees should be planted no closer than 15 to 20 feet from your foundation. For larger trees with far-reaching roots like maples, oaks, or poplars, a good guide is to plant as many feet from your home as the tree’s height is expected to reach at maturity. Some trees, like elms and willows, should only be planted far from where their roots may encounter sewer or water lines.
Planting trees far enough from your foundation will protect your home from root damage, but if you’re dealing with existing trees, you can still guard against roots. Root barriers form a physical boundary that will prevent roots from encroaching on your foundation and can help save you from expensive foundation repair costs.
