The grind decides whether your floor holds.
Diamond grinding takes your slab down to clean, open concrete so the coating bites in. Our own grinders, with the dust pulled at the tool.
Insured and bonded · 5 years · every slab ground by the owner
Free quote on your slab
Photos of the slab and rough square footage get you a real number.
Resin is only as good as what it sticks to.
People shop for a floor by color. Nobody sees the grind once the floor is down, and it decides whether the floor is still holding in ten years.
Concrete gets troweled smooth when it is poured. That tight top layer, plus everything that has landed on it since, is a terrible thing to bond to. Sealer, paint, curing compound, oil and tire dust all sit right there. A coating poured over that bonds to the contamination, and when the contamination lets go, the floor goes with it.
Diamond grinding fixes that mechanically. Heads fitted with diamond tooling cut the top of the slab away until what is left is clean, open concrete with a texture the resin can key into. It is loud and dusty, and it is most of the labor on any floor we do. It is also the one step we will never shorten.
That is why we own our grinders and dust extractors instead of renting them by the day. A rented machine on a clock is a machine somebody wants to return early. Ours stay on the slab until the slab is right.
A dark, blotchy garage slab looks rough on the morning we show up. By the end of the first day it is pale, open concrete, and that is the only kind of surface we pour on.
Slabs caught halfway through the job.
None of these are pretty, and they are not supposed to be. Patches of old adhesive left behind by whatever flooring used to be down come off in the grind along with everything else, and the diamond tooling pads are what does the cutting.
A slab that is done grinding and ready for coating is pale, dusty and open. The vacuum hose comes out next, because getting every bit of that dust off is its own job. Dust left on the concrete is one more layer sitting between the resin and the slab.
Taking a slab back to bare concrete.
Coatings that already failed
Old paint, failed sealer, and most previous coatings come off in the grind. That includes the peeling store-kit floors a lot of people call us about. The failure comes off first, and the new floor starts from concrete.
Stains
Grinding removes the stained top layer of the slab, which takes care of most oil marks. Oil that has soaked deep can ghost back through, so a heavily stained garage gets a degreasing pass first and sometimes a primer.
Cracks and pits
The grind exposes things. Slabs on sandy coastal plain soil shift a little, and the hairline cracking that comes with it is normal around here. Cracks get chased out and filled before the coating goes down, so they do not telegraph through the finish six months later.
Dust
Every grinder runs into a dust extractor at the tool, so the dust gets captured right where it is made. There is still some. It is a lot less than people picture when they hear the word grinder.
How the grind day runs
Grinders, dust extraction and material come off the trailer first thing. The grind, the crack repair and the cleanup fill day one. The pour and topcoat come on day two, which is the fast half. You can walk on the floor the next morning, and vehicles go back on at day three or four depending on how warm it is.
Why the slab gets tested before you get a number.
A lot of the slabs around Wayne County went down without a vapor barrier under them, because for years that was normal practice. Those floors push moisture up through the concrete every day. A water table that moves with the season and eight months a year of real humidity do not help.
That vapor has to go somewhere. If it meets a coating that cannot breathe, it collects underneath and lifts it. That is the bubbled, peeling floor people describe a year after the work was done.
A grind opens the concrete. It does not dry it out. So the test comes first.
So we test before we quote. If your slab is wet, we tell you and price a system that can handle it. If it is bad enough that no coating belongs on it, we tell you that too. It is a shorter conversation than the one that happens after a floor fails.
Where the kit from the hardware store goes wrong.
Store kits fail for one reason more than any other. They go over sealed concrete with no mechanical prep. An acid etch does not open the slab the way a diamond grinder does, so the coating sits on top of the concrete instead of keying into it, and it waits for something to pull it loose.
When we get called to one of those floors, the job starts the way every job starts. The grinder comes off the trailer, and the old kit comes off the slab.
Dudley is a short haul from our base in Goldsboro, and it sits in Wayne County, which is home for us. Grinding is the first day of every floor we put down there. These are the Dudley pages for what goes on top of it, plus the countertop work Beto pours too. The full concrete grinding page covers every town we work in, and the Dudley page has the rest. Ready to find out what your slab needs? Send photos of the slab.
Grinding questions, answered plainly.
Can you grind off a floor coating that is already peeling?
Usually, yes. A coating that is already lifting tells us something about the slab, so we find out why it failed before the grinder comes out. If the cause was poor prep, a proper grind takes care of it. If the cause was moisture, the system that goes on top has to change too.
Why grind instead of acid etching?
Two reasons. Acid cannot cut through sealer or curing compound, so a coating over an etched slab still bonds to whatever was sitting on top. And a grind takes the surface down far enough to expose the cracks and pits that need filling, which is a repair an etched slab never gets.
Will the dust get into the rest of the house?
Very little of it. The extractor catches most of it at the grinder and the rest gets vacuumed off before anything is poured. Keeping the door between the garage and the house shut on grind day takes care of most of what is left.
Do I have to clear the room out completely?
Yes, completely. We grind the whole slab from wall to wall, so the room has to be empty the morning we start. That means boxes, shelving and anything stored in the corners. Clearing it the weekend before goes a lot better than clearing it that morning.
Can grinding fix the cracks in my slab?
Yes, as part of the same prep day. The grind opens up cracks that were hiding under dirt or an old coating, and pits get patched flat along with them, so the finished floor reads as one even surface. If a crack is wide or looks like it is still moving, we point it out when we come look at the slab.
How loud is the grinding?
It is loud. A floor grinder is a heavy machine cutting concrete, and there is no quiet way to do that. The noise belongs to the prep day. The pour and topcoat day that follows is a lot calmer, and the house gets its quiet back.
Want to know what your slab needs?
Send photos of the slab and the rough square footage. We will tell you what the grind has to take off, then come look at it.
Call and you get Beto Ponce. Or look through the gallery and see what goes on top of a good grind.
(919) 440-1333