Mechanical root cutting: auger root saws vs jetting root cutters

01 /What is mechanical root cutting?

Mechanical root cutting is the physical removal of roots from inside a sewer pipe using a blade or cutter that is pushed through the line and rotated against the root mass. It is the most common way to clear a root blockage because it works immediately, needs no chemicals, and can be done from an existing cleanout.

There are two families of equipment. Cable machines (drum or sectional augers) rotate a steel cable with a cutting head on the end. Jetters push a high-pressure hose into the line; the water either drives a spinning cutter head or blasts roots with rotating nozzles. Both have their place, and many root-prone lines benefit from one followed by the other.

02 /How does a cable root saw work?

A cable root saw is a toothed or bladed head fixed to a spinning steel cable. As the operator feeds cable into the line, the head bores through the root mass and shears roots off against the pipe. On a 100 mm (4 inch) lateral, a professional machine typically runs a cable around 16 to 19 mm (5/8 to 3/4 inch) with a cutter sized for the pipe.

1. Open flow

   The operator usually starts with a smaller spear or spade head to punch through and let standing water drain, which makes the rest of the job cleaner and safer.

2. Size up

   A root saw close to the pipe's inside diameter is run through the full length to cut the mass back toward the wall.

3. Multiple passes

   Dense masses need several passes, with the head retrieved and cleaned between them.

4. Flush and check

   Running water while cutting carries cuttings downstream. Roots on the head show how much was removed.

Cable machines are quick, portable and relatively inexpensive to run. Their weakness is that a rotating blade cuts a round path; roots in the joint gap and fine hairs along the wall can remain, giving regrowth a head start. DrainAugering.ca covers cable sizing and head selection in more depth.

03 /How does a jetting root cutter work?

A jetting root cutter uses the water flow from a high-pressure jetter to spin a cutting head or chain against the pipe wall. Some are turbine-driven cutters with blades; others are chain flails or aggressive rotating nozzles. Rear-facing jets pull the hose forward, and the water carries the cut roots downstream to the main.

Residential jetters typically run in the low thousands of psi with modest flow; truck- and trailer-mounted units produce far more flow and are used for heavy root masses and larger pipe. More flow generally does more useful cleaning than more pressure alone. SewerJetting.ca explains pressure, flow and nozzle choice.

Jetting cutters tend to leave the wall cleaner, which can lengthen the interval before roots block the line again. They also flush grease and debris the roots have collected. The trade-offs are cost, the need for good access and water supply, and the risk of damaging fragile pipe.

04 /Cable root saw or jetting root cutter: which is better?

For a first response to a backup, a cable root saw is usually the right tool because it restores flow quickly and cheaply. For a line on a maintenance cycle, or before a camera inspection or lining, a jetting root cutter usually does the more complete job.

05 /Can root cutting damage the pipe?

Yes, especially in old clay, concrete, Orangeburg or already-cracked pipe. A cutter can catch on an offset joint or a broken bell and pull a fragment loose; a jetter can blow out a weakened section or drive water and debris into voids around a failure.

• Ask the contractor whether they camera before cutting when the line has a history of breaks or when soil has come back on the cable.
• Use a cutter matched to the pipe size and material; oversized or aggressive heads on thin-wall pipe increase risk.
• Stop if the cable binds repeatedly at one distance or brings back soil, clay fragments or pieces of pipe. That points to a structural defect, and cutting harder will not help.
• Expect a professional to tell you where resistance occurred by footage, so the defect can be located later.

If you are weighing a rental machine anyway, the DIY root removal guide sets out which tools can handle a root-bound main, the steps from the cleanout, and the signs that mean stop.

06 /What does root cutting cost?

Planning estimates (2026) for typical Canadian residential work are below. They assume an accessible cleanout and a 100 mm lateral of normal length.

The root removal cost guide compares the long-run cost of a cutting cycle with lining or replacement. Use the Root Risk Calculator to see how aggressive your situation is, then request quotes.

07 /What should a good root-cutting visit include?

1. A question about history: how often, which drain overflows, any past camera footage.
2. Clearing from the main cleanout with a cutter sized for the pipe, not only a small spear head.
3. Running water throughout to carry cuttings away.
4. A note of any distance where the cable bound or brought back soil or pipe fragments.
5. Ideally a camera pass after cutting, with the recording provided to you.
6. A written invoice naming the method, head size and any defects found.

If a contractor recommends replacing the whole line after a cable job without showing you camera footage, ask for the footage first; what roots in a sewer line look like helps you read it. A repair decision should rest on evidence, and SewerQuotes.com explains how to compare competing quotes.

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