methods
Choosing a Concrete Cutting Method: Slab, Wall, Core or Wire
Slab sawing, wall sawing, core drilling and wire sawing each solve a different geometry problem. This decision guide explains what each method does best, where it struggles, and how to match the method to your cut.
Concrete cutting is not one technique — it is a family of them, each built around a different geometry problem. The right method for your job is usually obvious once you frame the question correctly: Is the surface horizontal or vertical? Do you need a round hole or a straight cut? How thick is the concrete, and how much room does the equipment have to work? This guide walks through the four workhorse methods — slab sawing, wall sawing, core drilling and wire sawing — so you can arrive at a request already speaking the same language as the crew.
Start with the geometry
Start with the geometry
Before comparing tools, answer four questions about the cut itself. These four answers point you at the method faster than any specification chart:
- Orientation — is the concrete flat on the ground, or vertical like a wall?
- Shape — do you need a round hole (a core) or a straight-line cut (an opening or removal)?
- Depth — how thick is the concrete you are cutting through?
- Access — can equipment reach the cut, and is there room for a saw, a track, or a wire system?
Slab sawing (flat sawing)
Slab sawing (flat sawing)
Slab sawing uses a walk-behind saw with a rotating diamond blade to cut horizontal surfaces — floors, slabs on grade, pavement, bridge decks. It is the default for any straight cut on a flat surface: trench lines for utilities, control and expansion joints, and the perimeter cuts that let a section of slab be removed. Slab saws are fast and efficient within their depth range, and because the operator walks the machine along a chalk line, they produce long, straight, accurate cuts. Their limit is depth and orientation: blade diameter caps how deep they reach in one pass, and they only cut down into a horizontal surface. Learn more on the slab sawing service page.
Wall sawing (track sawing)
Wall sawing (track sawing)
When the cut is vertical — or on any surface a walk-behind saw cannot ride — wall sawing takes over. A track is anchored to the surface and a saw head travels along it, cutting precise straight lines regardless of orientation. This is the method for doorway and window openings in walls, for cutting elevated slabs from below or on steep surfaces, and for any straight cut that needs to be dead-accurate on a vertical face. Wall saws reach greater depths than slab saws and can make plunge cuts, which makes them the go-to for doorway openings and window openings. See the wall sawing service page for details.
Core drilling
Core drilling
Core drilling makes round holes. A cylindrical diamond-tipped bit rotates into the concrete and removes a solid core, leaving a clean, precise circular opening. It is the method for penetrations — plumbing and conduit runs, HVAC lines, floor drains, anchor and dowel holes, and test cores for material sampling. Diameters range from small conduit holes to large penetrations, and cores can be drilled vertically, horizontally or at an angle. Where a straight saw cut cannot make a round hole, coring is the only clean answer. Explore the core drilling service and applications like plumbing penetrations and core sampling.
Wire sawing
Wire sawing
Wire sawing is the heavy-duty specialist. A diamond-beaded cable is looped around the concrete and driven at speed, slicing through mass that is too thick, too irregular, or too heavily reinforced for a blade. It has effectively no depth limit — the wire simply wraps whatever it needs to cut — which makes it the method for massive foundations, bridge components, thick columns and large structural members. It is also the quietest and lowest-vibration option, useful near sensitive structures. Wire sawing takes more setup than a slab saw, so it is reserved for cuts the other methods cannot make. See the wire sawing service page.
Rule of thumb
Flat and shallow → slab saw. Vertical and straight → wall saw. Round hole → core drill. Massive or wildly reinforced → wire saw.
Method comparison
A side-by-side view of what each method does best. Depths are typical trade ranges, not fixed limits — a crew confirms reach for your specific equipment and cut.
| Method | Best for | Orientation | Typical depth reach | Notes |
|---|---|---|---|---|
| Slab sawing | Straight cuts in floors, pavement, joints, trench lines | Horizontal only | Shallow to mid (single-pass by blade size) | Fast, straight, efficient |
| Wall sawing | Openings and straight cuts in walls or elevated slabs | Any, incl. vertical/overhead | Deeper than slab saws; plunge-capable | Track-guided, precise |
| Core drilling | Round penetrations and test cores | Any angle | Depth by bit length; deep possible | Only method for clean round holes |
| Wire sawing | Massive or heavily reinforced concrete | Any | Essentially unlimited | Most setup; low vibration/noise |
How to decide
How to decide
Most jobs sort themselves quickly: a trench in a warehouse floor is slab sawing, a new doorway is wall sawing, a conduit penetration is core drilling, a thick foundation section is wire sawing. Complications come from combinations — a deep floor cut near the reach limit of a slab saw, or an opening that needs both saw cuts and cores. In those cases, a crew often blends methods, and the scanning step decides how much reinforcement they are working around. Two adjacent guides help: slab sawing vs. core drilling drills into that specific choice, and GPR scanning before cutting explains why the reinforcement question comes first.
Not sure which bucket you fall into? Request pricing with a description and photos, or upload plans and let a crew recommend the method during the takeoff.
Frequently asked questions
- Can one method do everything?
- No. Each method solves a different geometry: slab saws cut flat surfaces, wall saws cut vertical and elevated ones, core drills make round holes, and wire saws handle massive or heavily reinforced concrete. Many jobs use a combination.
- When is wire sawing worth the extra setup?
- When the concrete is too thick, too irregular, or too heavily reinforced for a blade — deep foundations, large columns, bridge members — or when low vibration near sensitive structures matters. For routine cuts, faster methods are more economical.
- How do I know how thick my slab is?
- Original construction drawings are the best source. If those aren't available, a crew can confirm thickness on site, and scanning can also indicate depth and reinforcement before any cut is made.
- What if I need a round opening larger than a standard core bit?
- Large round or shaped openings are sometimes made by scoring a series of cores or by combining coring with saw cuts. A crew will recommend the most efficient approach for the diameter and location.
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