A rock saw attachment will do things no other skid steer tool can — cut a clean, narrow trench through granite bedrock, slice through a 20-inch concrete slab, or open a utility corridor in winter-frozen Prairie hardpan. It's also one of the most hydraulically demanding attachments on the market. If your machine doesn't have high flow, this conversation is short.
Also called a wheel saw or pavement saw, the rock saw attachment mounts to the skid steer's quick-attach plate and runs a large-diameter cutting wheel — typically 48 to 60 inches — driven by a high-torque hydraulic motor. The wheel carries industrial cutting teeth: either diamond segments bonded to the wheel face or replaceable carbide-tipped teeth, depending on the intended material.
The cutting wheel spins at high RPM and is lowered into the material using the skid steer's loader arms. You drive forward slowly — measured in feet per minute, not yards per minute — and the wheel cuts a clean slot. Depth control is hydraulic. Most units also offer a side-shift mechanism that lets you offset the cut 24 inches or more from the machine centreline, which matters when you're working close to a curb, wall, or existing structure.
The result is a precise, clean-walled trench or cut joint — something a bucket, breaker, or trencher chain simply cannot produce. When a municipality spec says "saw cut expansion joint" or "neat line cut for utility corridor restoration," this is the attachment doing that work.
The naming creates confusion. Here's the practical distinction:
| Feature | Rock Saw | Asphalt / Pavement Saw |
|---|---|---|
| Blade diameter | 48–60 in | 24–36 in |
| Max cutting depth | 18–24 in | 6–12 in |
| Hydraulic flow needed | 30–45 GPM (high flow required) | 20–30 GPM (some mid-range machines) |
| Weight | 1,800–2,400 lb | 1,200–1,500 lb |
| Best material | Bedrock, reinforced concrete, frozen ground | Asphalt, road base, light concrete |
| Cutting speed | Slow — feet per minute | Faster — more productive on pavement |
If the job is cutting asphalt pavement for road repair or shallow utility work in an urban corridor — the asphalt saw is the right tool. It'll run on machines that can't support a full rock saw and will move faster on road-grade pavement. But if you're cutting through bedrock or a thick concrete foundation, an asphalt saw will destroy its blades trying to do what a rock saw is built for. Get the right one for the material.
This is the key spec that eliminates most casual buyers. Rock saws require high-flow hydraulics — typically 30–45 GPM at 2,500–3,000 PSI operating pressure. Standard skid steer auxiliary flow tops out around 22–25 GPM. That's not enough.
High-flow skid steers — like the Bobcat T870, Case TR340, Cat 299D3, or Deere 333G with the high-flow option — deliver 30–45 GPM and are the right platform for this attachment. Compact track loaders generally make better rock saw platforms than wheeled skid steers; the tracks provide better traction and stability when pushing through hard material.
Before renting or buying a rock saw attachment, confirm your machine's actual high-flow aux output. Not the standard flow. The high-flow circuit. They're different connectors (typically high-flow machines have a separate coupler pair), and not every machine has it even if the base model supports it as an option.
Two cutting technologies, two different use cases:
Diamond segments are bonded to the wheel and cannot be individually replaced — the whole blade (or blade segments) is replaced when worn. They excel at cutting hard, consistent materials: granite, dense limestone, reinforced concrete with high compressive strength. Diamond cuts cleaner and lasts longer in these materials than carbide.
The tradeoff: diamond blades don't like variable or soft materials. Clay, sandy aggregate, and mixed debris load the blade differently and can cause uneven wear. Diamond is also far more expensive to replace. A full diamond blade for a 48-inch rock saw can run $1,500–$4,000+ CAD depending on diameter and segment count. You're buying precision cutting performance and longevity for the right application.
Carbide teeth are bolted to the wheel in fixed holders and can be replaced individually as they wear. More forgiving on varied material, easier to maintain in the field, and much cheaper to keep running. A set of replacement carbide tips runs $500–$1,500 CAD depending on wheel size and tooth count. If a tooth gets damaged, you replace that tooth — not the whole blade assembly.
Carbide is well-suited to asphalt, frozen ground, mixed rock and soil, and applications where the material varies. Less suited to very hard granite or high-strength concrete, where diamond will outperform it on both speed and blade life.
Most contractors doing utility work in Canada use carbide teeth as the default, switching to diamond blades only when they consistently work in hard granite or high-PSI concrete. The maintenance simplicity of individual tooth replacement makes carbide more practical for general-purpose work.
The rock saw / wheel saw occupies a specific niche. Outside of that niche, something else (trencher, breaker, bucket) is almost certainly better. Inside it, nothing compares.
Alberta, Saskatchewan, and Manitoba have ground that freezes 4–6 feet deep in a serious winter. A trencher chain struggles — badly — in frozen Prairie hardpan. A hydraulic breaker excavates it, but slowly and with poor trench wall quality. A rock saw cuts a clean slot through frozen ground at a pace that actually makes a utility corridor job feasible in February. Gas and water utilities in Prairie cities use rock saws regularly for exactly this reason.
Municipalities across Canada require saw cuts at specific intervals on new concrete paving, at expansion joints, and when removing pavement sections for maintenance. The rock saw / pavement saw produces the straight, plumb cut that asphalt and concrete work requires. A bucket edge doesn't. Neither does a cold planer.
Parts of BC (interior, northern) and most of the Canadian Shield in northern Ontario and Quebec put bedrock at or near the surface. Running a water or gas line through Shield terrain means cutting rock, period. Mini excavators with hydraulic hammers are one option. A rock saw attachment on a skid steer is often faster and produces better trench geometry, particularly for shallow-to-mid-depth utilities (6–18 inch depth).
Before removing a concrete slab or foundation section, saw cutting the perimeter makes the break cleaner and protects adjacent material. A skid steer with a rock saw attachment can score a demolition line around a building pad, then a grapple or breaker removes the scored sections. More controlled than just hammering from above.
Rock saw attachments weigh 1,800–2,400 lb. That's the attachment weight before you factor in the material resistance on the blade. Your machine's rated operating capacity (ROC) must comfortably handle the attachment weight — verify with the stability chart in the operator's manual, with the attachment in the lowered and raised positions.
Practically: mid-large skid steers (Cat 289D3, Bobcat T770, Case TR310+, Deere 333G) with the high-flow option are the minimum viable platform for a full rock saw. Smaller machines in the 50–70 HP / 2,000–2,500 lb tipping load range don't have the hydraulic output or structural capacity.
For lighter pavement saw work (asphalt, shallow concrete), mid-size machines with high-flow option (Bobcat S650, Cat 259D3) may be sufficient. Check the specific attachment's weight and flow spec against your machine's actual output.
This is not a cheap attachment. New rock saw attachments from established brands run $18,000–$35,000+ CAD depending on width, depth capacity, and manufacturer. Asphalt/pavement saws in the 24–36 inch range are considerably less — $8,000–$18,000 CAD new.
Used units appear on Ritchie Bros. and Iron Planet auctions in Canada periodically. They're worth considering for established contractors with known high-use applications. Inspect blade condition carefully — a worn diamond blade that needs replacement adds $2,000–$4,000 to the effective purchase price.
Rental is the right answer for most one-off or occasional applications. Equipment rental companies serving municipal contractors in Alberta and Ontario typically have rock saw / pavement saw attachments available. Day rates vary widely ($400–$900 CAD/day), and availability in smaller markets can require advance booking. Call ahead.
When the goal is cutting rock or concrete, operators in Canada typically choose between three approaches:
In practice, many utility contractors use all three at different stages of a job or in different conditions. The rock saw earns its rental cost when the material genuinely demands it.
Looking for ground-cutting attachments available in Canada? Browse the skid steer trencher catalog and auger catalog for verified product pages on real models sold through Canadian dealers.