Cutting Tree Roots With a Chainsaw (Chain Care)
A chainsaw should cut only a fully exposed, clean root, never soil or hidden debris. Before starting, check for utilities, stones, tension, and effects on tree stability. Use the bar and chain approved for your saw, wear full protective gear, and stop to inspect after any ground strike, bind, or unusual vibration.
A stump root can look like a simple cut, but dirt and stones can damage a chain in seconds, while cutting a major root may make a standing tree unsafe. The safest approach is to expose and clean a small root fully, then decide whether a chainsaw is truly the right tool. If you cannot keep the chain clear of soil, use a hand saw or reciprocating saw instead.
In my field work, a frequent source of chain trouble is a cut made before the root is clean and fully visible. A short pause to check the whole cut path can prevent a damaged chain, a pinched bar, or an unstable tree. The steps below focus on protecting you, the saw, and the tree.
Equipment Setup and Safety Preparation
Root cutting with a chainsaw means cutting only a visible, soil-free root with a saw and chain approved for that machine. A chainsaw is not a digging tool. Before cutting, confirm the root is safe to remove, clear of utilities and embedded objects, and not holding dangerous tension.
Decide whether the root is safe to cut
A structural root is a large root that helps support or feed a standing tree. Cutting one near the trunk can weaken the tree, affect its health, or make it more likely to fail. There is no single distance or root diameter that makes a cut safe for every tree.
Do not cut major roots close to a standing tree without an assessment by a qualified arborist. If the tree leans, has a damaged trunk, sits near a home or power line, or may shift when the root is cut, stop and get professional help. For stump removal, confirm the tree is already down and the stump cannot roll or move.
Look for underground services before digging. Contact your local utility-locate service and follow its instructions; markings may not identify every private line, such as wiring to a shed or irrigation pipe. Also check for fencing, nails, rocks, and other objects that could be buried in or beside the root.
Match the saw and wear protective gear
Use a sharp, serviceable saw with a bar and chain combination permitted by the saw maker. A shorter bar and adequate power can be easier to manage, but no engine-size-to-bar-length ratio makes root cutting safe on its own. Follow the saw manual for the approved setup and operation.
Wear a helmet, eye and face protection, hearing protection, chainsaw-rated leg protection, gloves, and sturdy boots. Follow ANSI Z133 practices; OSHA 1910.266 applies to covered logging work. Keep bystanders out of the work zone, plan a clear way to step back, and keep both hands on the saw. Never cut while holding a loose root or standing in an unstable excavation.
| Check before cutting | What to confirm | Stop if… |
|---|---|---|
| Tree and root | The cut will not remove a major support root | The tree may shift or its stability is unclear |
| Cut path | Root is exposed and clean on all sides of the cut | Dirt, stone, wire, or fencing remains |
| Saw setup | Bar mount, pitch, gauge, and drive-link count match | Any part does not match the manual |
| Work area | Footing, exit path, and bystander clearance are adequate | The root or soil may collapse or move |
Field Root-Cutting and Landscaping Operation
A clean cut begins with preparation, not throttle. Expose the root enough to see the full cut path, remove soil and debris by hand, and check for pinch points. If you cannot keep the chain out of the ground for the entire cut, switch to a hand saw or reciprocating saw.
Expose, clean, and inspect
Dig around the root with hand tools, not the chainsaw. Clear the area where the chain will travel, including the underside if you can reach it safely. Do not place your hand under a root that could settle or roll. If the root is trapped, loaded, or likely to spring when cut, stop and have it assessed.
Check the chain for damage and correct tension, along with the guide bar, chain brake, chain catcher, and fasteners. Fill the bar-oil reservoir with purpose-made bar-and-chain oil. Verify oil reaches the chain as the manual directs; oil flow depends on the saw design and conditions, so use the maker’s check rather than a universal rate.
Start the saw on stable ground using the manufacturer’s procedure, with the chain brake engaged as directed. Confirm the chain stays still at idle. If it moves at idle, stop and follow the manual or arrange service. Use the maker’s specified idle and maximum speed settings; there is no safe universal RPM, and carburetor adjustment by guesswork can be unsafe.
Make a controlled cut
Set your footing before starting the cut. Keep a firm two-handed grip, the bar clear of the ground, and your body out of the chain’s path. Make a controlled cut only where the root is visible and will not pinch the bar. Do not force the saw if the chain slows, binds, or stops.
Stop immediately if the root shifts, the cut closes on the bar, the saw vibrates unusually, or the chain contacts soil or stone. Switch off the saw before inspecting it. A chain can be dulled or damaged by ground contact, and a pinched chain can stop abruptly, kick back, or derail.
Illustrative field scenario: A homeowner exposes a surface root but leaves packed soil beneath it. The saw begins cutting cleanly, then touches grit near the end of the cut. The right response is to stop, shut off, and inspect, not to finish the cut with a contaminated chain. Cleaning the root further or changing to a hand saw is the safer next step.
| Root condition | Preferred approach | Why |
|---|---|---|
| Fully exposed, clean, small root; no tension | Chainsaw may be suitable if the manual permits the setup | The full cut path can stay clear of soil |
| Root partly buried or packed with grit | Hand saw or reciprocating saw after safe exposure | Keeps the chainsaw chain away from contamination |
| Large root near a standing tree | Pause for an arborist’s assessment | Cutting may affect tree stability or health |
| Root under tension, trapped, or moving | Stop and seek qualified help | Movement can pinch the bar or release stored force |
Chain, Bar, Sharpening, and Saw Maintenance
A chain that cuts poorly may be dull, damaged, too loose, or mismatched to the bar. Soil and stones can quickly harm cutting edges. After contamination or unusual vibration, stop and inspect the chain, guide bar, sprocket, and brake before restarting.
Check chain fit and sharpness
Chain fit depends on four things: pitch, gauge, drive-link count, and bar mount. All must match the saw and bar. For example, a 3/8-inch low-profile chain with a .050-inch gauge is not interchangeable with a standard 3/8-inch chain. Read the markings and verify them against the manuals; do not choose by appearance alone.
Sharpen cutters to the chain maker’s instructions. Depth gauges, also called rakers, control how much wood each cutter takes. A .025-inch (0.635-mm) setting is common on some chains, but it is not universal. Use the correct depth-gauge tool and the chain maker’s setting.
After a strike, look for cracked, bent, or loose parts, damaged cutters, a burred or uneven bar rail, and debris in the bar groove or oil ports. Do not run a chain or bar that is cracked, bent, loose, or otherwise damaged. If you are unsure whether a part is serviceable, have it checked before use.
Respond to a dull chain or ground strike
A chain that needs extra force, makes fine dust instead of normal chips, or cuts unevenly may need attention. Stop rather than pushing harder. For root work, a dull chain can encourage poor control and increase the chance of binding.
If the chain strikes dirt or stone, stop the saw and inspect it before continuing. Clean packed debris from the bar groove and oil ports, check the chain tension and cutters, and sharpen or replace a chain dulled by contamination. Do not assume the chain is fine because it still moves.
Illustrative field scenario: A root is clean at the top but has a stone embedded on its underside. The chain hits it and the saw begins to vibrate. Shut down and inspect the chain, bar, sprocket, and brake. If any part is damaged or the fault is unclear, do not restart the saw.
Shutdown, Storage, and Seasonal Care
Safe root work includes shutting down and checking the saw after the cut. Engage the brake, switch off the engine, and let the saw cool before handling the chain. Clean, inspect, and store it as the manual directs, then check that the remaining tree or stump area is stable.
When the cut is complete, engage the brake and switch off the saw. Let hot parts cool before touching the chain or bar. Clear debris from the bar groove and oil ports, check chain condition and tension, and clean the saw according to its manual.
If the tree remains standing, reassess it before leaving. A newly cut root may affect support even if the tree did not move during the cut. Keep people away and seek an arborist’s advice if the tree leans, shifts, or appears unstable. Backfill or secure an excavation only when doing so will not hide a hazard or place anyone at risk.
For storage, follow the saw maker’s directions for cleaning, fuel, chain tension, and storage position. Use only the fuel mix specified for that saw. Some models call for a 50:1 gasoline-to-two-cycle-oil ratio by volume, but never infer the ratio from a saw’s age or brand. Check the manual each time you are unsure.
Frequently Asked Questions
These answers cover the key choices: when a chainsaw is suitable for a root, how contamination affects the chain, and when to stop. The rule is simple: cut only a fully exposed, clean root with a correctly matched saw, and stop if the root, tree, or equipment may move or fail.
Can I cut tree roots with a chainsaw?
Yes, but only when the root is fully exposed, clean, and free of hidden objects or unsafe tension. Keep the chain clear of soil throughout the cut.
Will cutting a root dull my chainsaw chain?
A clean root may be cut with a suitable, sharp chain, but soil or stone contact can quickly dull or damage cutters. Stop and inspect after any strike.
Can I cut a root that is still partly buried?
Not with the chainsaw chain touching or likely to touch soil. Expose and clean the cut path first, or use a hand saw or reciprocating saw.
Is it safe to cut roots close to a tree trunk?
Not without an arborist’s assessment. Large roots near the trunk can help support and feed the tree, and cutting them may affect stability or health.
What chain should I use for root cutting?
Use only a chain that matches the saw and bar in pitch, gauge, drive-link count, and bar mount. Check the saw and chain manuals; visual similarity is not enough.
What should I do if the chain hits a rock?
Stop, switch off the saw, and inspect the chain, bar, sprocket, and brake. Do not restart with a cracked, bent, loose, or damaged part.
How do I know whether the chain needs sharpening?
Poor cutting, uneven cuts, or a need to force the saw can signal a dull or damaged chain. Stop and inspect it; do not push harder to finish.
Can I use regular motor oil for bar lubrication?
Use purpose-made bar-and-chain oil and follow the saw manual. Do not assume a universal oil viscosity or flow setting suits every saw.
What fuel mix should I use?
Use the ratio specified in the saw manual. A 50:1 mix applies only where the manufacturer calls for it; do not guess based on brand or age.
Should I keep cutting if the root shifts or pinches the bar?
No. Stop the saw and reassess the root and work area. Movement can create a pinch or release tension, so get qualified help if the cause is unclear.
(This article was written by one of our staff writers, Julian Barrett. Visit our Meet the Team page.)
