What concrete surface preparation covers
Surface preparation is the work done to the concrete before any coating goes down. It means grinding or shot blasting the slab to open the pores, testing for moisture, and repairing cracks, spalls, and joints so the coating bonds and lays flat. Prep is not optional — it is the single biggest factor in whether your floor lasts five years or fails in one.
How the work goes
Here is what concrete surface preparation includes, step by step.
- 1
Inspect the slab for cracks, spalls, oil stains, and old coatings or sealers.
- 2
Test for moisture vapor emission and calcium chloride to flag high-moisture slabs.
- 3
Diamond grind or shot blast the surface to open the concrete pores and remove laitance and old sealer.
- 4
Repair cracks, spalls, and joints with the right filler, then shave flush so the surface is flat.
- 5
Vacuum and clean the slab so no dust or debris is left before the primer goes down.
Why this step matters
Epoxy bonds to the surface of the concrete, not to the dirt, sealer, or laitance on top of it. If the slab is not ground open, the coating sits on a weak layer and peels. If moisture is not tested, a high-moisture slab can blister the coating months later. If cracks are not repaired, they telegraph through and crack the new floor. Prep is the difference between a floor that lasts and one that fails.
What goes wrong when this step is skipped
These are the failures we see when this work is done wrong or not at all.
Coating over a sealed or laitance-covered slab — the epoxy peels in sheets within a year.
Skipping moisture testing — a high-moisture slab blisters and delaminates months later.
Coating over moving cracks and joints without filling — the cracks telegraph through and split the floor.
Leaving oil stains in the slab — oil keeps bleeding up and softens the coating from underneath.
Not vacuuming dust — dust gets trapped under the primer and weakens the bond.
What it costs in Columbus
Surface preparation in Columbus typically runs $1.50 to $4 per square foot, depending on the slab condition and what has to come off. A clean slab that just needs a grind is at the low end; a slab with old coatings, oil, or heavy damage is at the high end. Prep is usually priced into the full floor quote. These are estimates — your real cost depends on the slab.
What moves the price
Slab condition — cracks, spalls, and oil stains add repair cost.
What is on the slab now — bare concrete vs old coatings or sealers to remove.
Moisture testing — required on most slabs, adds a small cost.
Square footage — bigger floors cost less per foot to prep.
These are estimates only. A real price comes after a free on-site walk-through.