Large Stump Grinding — 36 Inches and Above Requires Serious Equipment Most Companies Do Not Have

You have a large stump in your yard — 36 inches across, maybe 48 inches, maybe even bigger. You called a couple of stump grinding companies and they either declined the job, quoted an outrageous number, or told you they would need to bring in special equipment they do not actually own. Or maybe you went the rental route, spent a full day wrestling with a 20 HP grinder from the hardware store, and barely made a dent in the surface. Either way, you are here because that stump is still in your yard and you need someone who can actually handle it.

That is exactly what we do. Our 100 HP Rayco commercial stump grinder is designed for the stumps that other equipment cannot touch. We have been grinding large stumps across Hampton Roads — Norfolk, Virginia Beach, Chesapeake, Hampton, Newport News — for over 14 years, and oversized stumps are where our equipment and experience make the biggest difference. With a 5.0 Google rating and over 70 reviews, we have the track record to back up our capability. If the stump is in the ground, we can grind it.

Why Most Stump Grinders Cannot Handle Large Stumps

The stump grinding industry has a dirty secret: most equipment on the road today is undersized for large stumps. The majority of stump grinding companies in Hampton Roads operate machines in the 25 to 40 HP range. These are perfectly adequate for average stumps — an 18-inch pine, a 12-inch crepe myrtle, the kind of routine work that makes up the bulk of residential stump grinding. But when you put one of these machines in front of a 36-inch oak stump with a root flare that is five feet across, the math stops working.

Horsepower determines how much material the cutting wheel can remove per pass. A 25 HP grinder taking a pass across a 36-inch hardwood stump is going to remove maybe an eighth of an inch of material before the machine bogs down and the operator has to back off. At that rate, a large oak stump could take six to eight hours of continuous grinding — assuming the machine does not overheat, assuming the cutting teeth do not wear out, assuming the operator has the stamina to keep at it. In practice, many companies with smaller equipment will simply decline the job rather than commit to that kind of abuse on their machine.

Rental grinders are even worse. The machines you can rent from home improvement stores typically range from 13 to 25 HP. They are designed for homeowner use on small, soft stumps — think 8 to 14 inches of pine or birch. Put one of these machines on a 36-inch oak or maple stump and you will accomplish almost nothing. The cutting wheel chatters across the surface, the teeth skip and bounce off dense heartwood, and after an hour of noise and frustration you have created a shallow dish in the top of the stump that is nowhere close to below grade. We get calls from homeowners in exactly this situation at least twice a month.

What Our 100 HP Rayco Does Differently

Our 100 HP Rayco commercial grinder is in a completely different class of machine. To put the power difference in perspective: our grinder has four times the horsepower of a typical professional-grade machine and up to eight times the power of a rental. That is not a marginal advantage — it is a fundamental difference in capability.

The cutting wheel on our Rayco is larger and carries more teeth than smaller machines, and each tooth is carbide-tipped for maximum durability on dense hardwood. The hydraulic sweep mechanism covers a wider arc per pass, which means we remove more material with every movement of the wheel across the stump face. Where a smaller machine takes a quarter inch per pass, our machine takes an inch or more, even on oak and other hardwoods.

The result is that we can grind a 36-inch hardwood stump in roughly the same time a smaller machine spends on an 18-inch stump. A 36-inch oak stump that might take a 25 HP machine all day — if it could finish at all — takes our 100 HP Rayco about two hours. A 48-inch stump might take us three hours. We have ground stumps over 60 inches in diameter for commercial lot-clearing projects in Virginia Beach and Chesapeake, and while those are full-day jobs, they are jobs that no other equipment in the area could even attempt.

Horsepower is not just about speed, either. More power means cleaner cuts, less vibration, and more consistent grinding depth. Our machine does not chatter or bounce on hard wood — it cuts through it steadily and deliberately. The end result is a cleaner hole, more uniform chips, and a finished grade that is smooth and even rather than rough and uneven.

Understanding Root Flare on Large Stumps

When we talk about a 36-inch stump, we are usually talking about the diameter at the cut — the top of the stump where the tree was felled. But the actual grinding job is often significantly larger than that number suggests, because of root flare.

Root flare is the swelling at the base of the trunk where the major structural roots begin to spread outward. On a large, mature tree, the root flare can add 50 to 100 percent to the effective diameter of the stump at ground level. A tree that was cut at 36 inches might have a root flare that is 48 or 54 inches across at the soil line. And on certain species — particularly oaks, maples, and tulip poplars — the root flare can extend even further, with major buttress roots radiating out several feet from the base.

All of that root flare needs to be ground below grade for a proper job. If you only grind the central stump and leave the root flare exposed, you end up with a ring of hard wood sticking up around the perimeter that will take years to decay and prevents you from having a smooth, usable yard. Our machine is wide enough and powerful enough to grind the full root flare in the same operation as the main stump, which is something that smaller equipment physically cannot do on large specimens.

This is one of the main reasons we always do a free on-site estimate before quoting a large stump job. The root flare is not something you can accurately assess from a photo — we need to see the stump in person, measure the full spread at ground level, and check the soil conditions and access route for our equipment. Every large stump is different, and the estimate accounts for the real scope of the work.

Cleanup and Chip Volume on Large Stump Jobs

One thing homeowners do not always anticipate with large stumps is the volume of wood chips the grinding process produces. Stump grinding does not make the wood disappear — it converts it from a solid stump into a pile of shredded wood chips. And on a large stump, that pile can be substantial.

As a general rule, grinding produces chips equal to roughly four to five times the volume of the original stump above grade, because we are also grinding below grade and including the root flare. A 36-inch stump that is 18 inches tall will produce enough chips to fill a small pickup truck bed. A 48-inch stump can produce a pile that is six feet across and two to three feet high. On the largest stumps we grind — 60 inches and above — we can generate multiple cubic yards of chips.

Our standard process is to fill the hole with as many chips as it will hold and mound the rest neatly nearby. The chips in the hole will settle over the next few months as they begin to decompose, and you may need to add topsoil to bring the area fully up to grade. We can also haul excess chips away if you prefer a completely clean site. Many homeowners use the extra chips as mulch for garden beds and around trees — they are natural, chemical-free, and break down into good soil over time.

For very large stump projects — lot clearing, multiple 36-inch-plus stumps, or commercial jobs — we discuss chip management as part of the estimate. On these jobs, having a plan for the chip volume is an important part of the project, and we work with homeowners and contractors to make sure the site is left in the condition they need.

If You Tried a Rental and It Did Not Work — You Are Not Alone

At least twice a month, we get a call from a Hampton Roads homeowner who rented a stump grinder, spent a full day and a couple hundred in rental fees working on a large stump, and ended up with a shallow divot in the surface and a very sore back. It is one of the most common paths to our phone number, and there is no shame in it. The rental companies are not going to tell you that their 20 HP machine cannot handle a 36-inch oak. They want the rental fee.

Here is the reality of rental grinders on large stumps. A typical rental unit has a 12 to 14 inch cutting wheel with maybe a dozen teeth. It is designed to take shallow passes on small, soft stumps. The operating position puts you right next to the machine in a shower of flying chips and debris. The wheels are small enough that the machine gets stuck in soft ground. And after four or five hours of operation, the teeth are dull and the machine is operating at a fraction of its already limited capacity.

Compare that to our setup: a 100 HP commercial grinder with a large cutting wheel, dozens of carbide-tipped teeth, operator controls that allow precise positioning, and the power to take full-depth passes on the hardest wood in the region. The machine runs all day at full capacity without overheating. The job that defeated your rental grinder takes us an hour or two.

If you have a partially ground stump from a rental attempt, we can absolutely finish the job. We pick up right where the rental left off, grind down to full depth, clean up, and leave you with the flat yard you were trying to achieve. Call for a free estimate and we will assess exactly what is left to do. Every stump grinding job we do comes with our full guarantee — if anything comes back, we come back and fix it.

Frequently Asked Questions