A Practical Guide to Equipment Types, Blade Selection, and Real Jobsite Applications
When it comes to cutting expansion joints, trenches for utilities, or performing road and slab demolition, contractors typically rely on two types of professional equipment: wall saws and floor saws (joint cutters).
Wall saws are powerful and extremely precise, but they're also more expensive and less mobile. Floor saws, on the other hand, are more affordable, compact, easy to transport, and ideal for most horizontal cutting work.
This guide focuses specifically on floor saws — how they work, how to choose the right model, and how to select the correct diamond blade for concrete vs asphalt. For a deeper understanding of how concrete composition affects blade performance, see How Concrete Composition Affects Diamond Blade Performance and Concrete Cutting Mechanics.
What Is a Floor Saw?
A floor saw (also called a joint cutter) is a walk-behind cutting machine designed for concrete, asphalt, stone, industrial slabs, and road surfaces. Floor saws are built to cut straight, deep, controlled lines using a large water-cooled diamond blade.
Types of Floor Saws
Floor saws can be compared using three key categories: engine type, blade size / cutting depth, and drive type (manual vs self-propelled).
1) Engine Types
Gas (Petrol) Floor Saws
Gas saws are the most common option for outdoor work.
Best for: roadwork, sidewalks and parking lots, slab cutting, utility trench prep, demolition cuts.
Typical power range: 3 to 19 kW (approx.)
Max cutting depth: just over 12 inches (30+ cm)
Why contractors like them: mobile, no power cord, works anywhere.
Diesel Floor Saws
Diesel models are built for heavy industrial cutting. Best for: deep slab cutting, industrial and infrastructure jobs, large-diameter blades, high production work.
Electric Floor Saws
Electric models are ideal for indoor use where emissions are a concern. Best for: interior slabs, warehouse floors, enclosed spaces, noise-sensitive environments.
2) Blade Size and Cutting Depth
Floor saw blades typically range from 12" to 36" in diameter. Larger blades allow deeper cuts but require more powerful machines. Always match blade diameter to the saw's rated capacity.
3) Drive Type
- Manual push — lighter, lower cost, suitable for shorter cuts
- Self-propelled — reduces operator fatigue on long cuts, more consistent feed rate
Choosing the Right Diamond Blade for Your Floor Saw
Blade selection depends on the material being cut:
- Concrete — use a segmented diamond blade rated for hard or medium concrete
- Asphalt — use a blade with softer bond to handle the abrasive, flexible material
- Green concrete — use an early-entry blade to prevent raveling. See Can You Dry Cut Wet Concrete? Risks, Speed & Blade Wear.
- Reinforced concrete — use a blade with high diamond concentration and durable segments
Browse the Distar USA Diamond Blades for Concrete, Tile & Stone collection to find the right blade for your floor saw application. For a full selection framework, see How to Choose the Right Diamond Blade for Your Job.
Safety on the Job
- Always use water cooling when wet cutting to control silica dust
- Wear P100 respirator, eye protection, and hearing protection
- Inspect blade for cracks or damage before each use
- Never exceed the blade's rated RPM
Further Reading
- How Concrete Composition Affects Diamond Blade Performance
- Concrete Cutting Mechanics
- Can You Dry Cut Wet Concrete? Risks, Speed & Blade Wear
- Groove Cutting with an Angle Grinder vs. Wall Chaser
- Dry Drilling in Concrete – When Is It Possible and When Is It Not?
- How to Choose the Right Diamond Blade for Your Job
- Wet vs. Dry Diamond Blade Cutting: Which Should You Use?
