A floor grinder is a heavy machine with rotating diamond tooling used to grind concrete surfaces. It removes coatings, glue, and high spots and opens up the concrete’s pores. Grinders are the main tool for prepping floors and for polishing concrete. Professional units are paired with dust collection or water to control silica dust.
What a Concrete Floor Grinder Does
A floor grinder works like a giant orbital sander for concrete. Swappable diamond tooling underneath does the cutting, and the crew changes it from coarse to fine as the job goes on.
You’ll run into a grinder in two kinds of jobs. Before a coating goes down, grinding cleans off old finishes and roughs up the surface so the new coating can grip. You can read more about that in our guide to concrete floor coatings. For polished concrete, the grinder does the whole job, from first cut to final shine.
Floor Grinders and Dust
Grinding concrete makes fine silica dust, and breathing it over time can cause serious lung disease. Federal rules cover floor grinders specifically, and the usual fixes are wet grinding or industrial vacuums hooked to the machine.
Floor Grinder FAQ
What does a floor grinder do?
It grinds the top of a concrete slab with spinning diamond tooling. That removes old coatings, glue, and high spots, opens the surface for a new coating, or starts the polishing process. Changing to finer tooling turns the same machine into a polisher.
Can I grind concrete floors myself?
You can rent grinders, but it’s hard work with a real learning curve and real dust risk. Uneven grinding can leave swirl marks or gouges that show through a finish. For a floor you plan to coat or polish, most homeowners hire a crew.