Garage Floor Pitting in Kenosha: The Surface Chemistry and the Fix
A field of tiny craters concentrated right under your tires is not random - it is road salt and freeze-thaw reacting with the surface in the exact spot that sees the most of both. Here is why, and the grind-fill-coat repair that actually stops it.
Pitting on a Kenosha garage floor is a surface chemistry problem, not a structural one - a reaction between road salt, trapped moisture, and repeated freezing that pops tiny craters out of the top skin of the concrete, concentrated almost exactly where your tires sit. It is the shallowest and most common surface damage a lakefront slab develops, and it responds well to a straightforward repair once you understand why it clusters the way it does. This article walks through the mechanism behind the pockmarks, how a grind-fill-coat repair actually closes the reaction down, and why simply filling the craters without grinding first is a fix that does not last.
TL;DR
Pitting is small, scattered surface craters caused by road salt soaking into the concrete and freezing repeatedly in the same spot - which is why it clusters under where you park. It is a surface reaction, not a sign the slab is failing. The fix is to diamond-grind past the reacted layer, patch each crater flush with a repair mortar, and seal the whole floor so brine can no longer reach the pores that feed the cycle. We read the pattern and depth on site, free.
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What a pit actually is, up close
Concrete near the surface is full of microscopic pores - it is not a perfectly solid material, even when it looks that way. A pit forms when water sitting in one of those pores freezes, expands, and pops a tiny bit of the surrounding paste loose, leaving a small crater behind. One event does very little. Repeated dozens of times over a winter in the same spot, those tiny losses accumulate into a visible pockmark, and a field of them side by side reads as the peppered, gritty texture people call pitting. It is shallow by definition - a few millimeters deep in most cases - which is the detail that separates it from the deeper, sheet-scale damage covered in our piece on concrete spalling.
Why the pitting clusters right where you park
The pattern is not random, and once you see it you cannot unsee it: pitting on a garage floor is almost always worst in the two strips where your tires sit and lighter everywhere else. That is because the reaction needs salt concentrated in the same spot repeatedly, and your tires are exactly what delivers it there. Every trip in off a salted road leaves a film of brine on the rubber and the wheel wells, and that brine drips onto the same patch of concrete each time you park. The salt holds the moisture against the surface rather than letting it evaporate, so that specific patch of slab goes through far more freeze cycles with standing moisture in its pores than the drier concrete along the walls. Over a season, the tire footprint accumulates the damage everywhere else is spared.
How pitting differs from a crack or a spall
Three kinds of damage get lumped together on a Kenosha floor, and they are genuinely different things. A crack is a line - a split running through the concrete, which can be shallow or can run the depth of the slab. Pitting is not a line at all; it is a scatter of individual, shallow craters, each one independent of the others until they eventually touch. Spalling is a step up in scale and depth from pitting - sheets and chips of the surface delaminating and lifting away, and it is frequently traced to something happening beneath the concrete rather than reacting with what lands on it, which our companion article on spalling covers in full. Naming which one you actually have matters, because the repair for each is different, and pitting caught early is the cheapest of the three to fix.
The grind-fill-coat repair, step by step
Fixing pitting properly is a short sequence, and skipping the first step is the most common reason a patch fails.
- Grind the whole surface. A diamond grinder takes the entire floor down past the salt-reacted skin to clean concrete, not just the craters themselves - because the pores immediately around a pit are usually just as compromised as the pit itself.
- Clear each crater. Every pocket gets vacuumed free of loose grit and dust so the patch material has clean concrete to bond to rather than debris.
- Fill flush with repair mortar. A polymer-modified patch goes into each crater and gets troweled level with the surrounding surface, closing the low spots that would otherwise catch water and grit.
- Seal the entire floor as one system. Once the patches cure, the coating goes down across the whole bay, so the repaired craters and the original concrete sit under a single continuous, bonded surface.
The grind is the step that decides whether this lasts, because it removes the reacted material a surface patch alone leaves behind. For how this fits into a bigger repair scope, see our garage floor repair page.
Floor peppered with small craters under the tires?
We read the pattern and depth in person - free, no pressure.
Why sealing the surface is what actually stops it
The reaction behind pitting needs an open, porous surface to work with. Patch the existing craters but leave the rest of the concrete bare, and next winter's brine finds a fresh set of pores to soak into - you have fixed last season's damage while this season's begins beside it. That is why the repair is not complete until the whole floor is sealed. Over the ground and patched slab we build a flexible polyurea base and finish it with a UV-stable polyaspartic topcoat, the flake system most people mean when they say "epoxy." Once that surface is bonded down, brine sits on top of it instead of soaking into anything, which takes the moisture half of the reaction away entirely - no open pores, no freeze cycle, no new pits. Our garage floor coating page covers how that build goes together, start to finish.
Wherever you're parked in the county - Paddock Lake, Twin Lakes, Salem Lakes, Somers, Bristol, Pleasant Prairie, or Kenosha proper - how far your pitting has spread is something worth seeing in person rather than guessing over the phone. Get a free on-site quote, and a licensed, insured installer will walk you through exactly what your floor needs.