The streets north of Ralston Road hold one of the densest runs of 1960s through 1980s ranch and split-level housing on Denver’s northwest side. Arvada has around 124,000 people, and plenty of them live in a house whose garage slab was poured fifty years ago. In that much time, somebody almost always did something to the floor.

So when we walk an Arvada garage, the first question is never what color you want. It is what is already down there and how hard it will be to get off. That answer moves the schedule more than square footage does. Here is how we read it, and how you can read it yourself.

The Three Things We Usually Find

Across Jefferson County, the old layer is nearly always one of three things. They fail in completely different ways, which is handy, because the failure tells you which one you have.

A big-box water-based epoxy kit

These are the boxed kits with a small bottle of hardener, a bag of flake, and an etching packet standing in for real mechanical prep. They look sharp for a season or two, then the bond gives up. Acid etching does not open Arvada’s older troweled slabs the way grinding does, so the coating sits on top of the concrete instead of keying into it. What you see is peeling in sheets. A corner lifts near the overhead door, water gets under it during a spring melt, and the sheet walks. Pull a loose edge and it comes up in a piece the size of your hand, clean grey concrete underneath.

Solvent-based porch and floor paint

The second most common find is straight porch and floor enamel, usually grey, occasionally that dark red. It behaves like paint, because it is paint. It does not peel in sheets. It powders. Run your hand across it and you get chalk on your fingers. Look at the two strips where the car sits and the color is gone entirely, worn to bare concrete in a pair of long ovals, while the perimeter under the shelving still looks almost new. That uneven wear is the giveaway. Paint has no real film build, so hot tires and grit take it down fast.

A concrete sealer nobody remembers applying

This one is sneaky. Plenty of Arvada slabs were sealed once, either by the builder or during a driveway job where the crew ran the sprayer a few feet into the garage. Nobody in the house remembers it. No color, no gloss, no peeling, and the floor looks like bare concrete. Then you pour water on it and the water beads. A penetrating sealer soaks into the top of the slab and makes it water-repellent, which is fine on a driveway and terrible for anything you want to bond. Coatings need to wet out and sink in, and a sealed slab pushes them back.

Two Tests You Can Do in Five Minutes

The tape test. Press a strip of duct tape down hard in three spots, one in the middle of a parking strip and two near the walls. Leave it a minute, then rip it up fast at a sharp angle. If coating comes up on the tape, the bond is already gone. Test several spots, because bond fails in patches long before it fails everywhere.

The water test. Splash a cup of water in four or five places and watch for two minutes. Concrete that is ready to accept a coating darkens and drinks it in. If the water sits in fat beads, there is a sealer or a residue up there. Check the corners as well as the middle, since spray application is rarely even.

Between those two, most homeowners can walk out of the garage knowing what they are dealing with. When we come out for a free look, we run the same tests plus a few you cannot do with kitchen supplies.

Why We Almost Never Coat Over What Is There

This is the part that surprises people, so let us be blunt. A coating system is only as good as its grip on the concrete. Put a strong new floor on a weak old layer and the new floor does not fix the old one. It inherits it. All of the adhesion is borrowed from whatever is underneath, so a kit that was already letting go now lets go with a heavier layer riding on its back.

The failure gets uglier, too. A thin failing paint film releases a chip at a time. That same film under a real coating releases in slabs, because the new material is stiff enough to hold a big piece together as it lifts. We have pulled up sections the size of a floor mat where someone coated over old paint to skip a morning of prep. Bonding to concrete means bonding to concrete, which is why our Arvada garage coatings work starts with removal rather than product selection.

What Removal Actually Involves

Everything comes off mechanically. We run diamond tooling on a walk-behind grinder with a vacuum attached, and the tooling changes with what is up there. Soft, gummy coatings load up fine tooling instantly, so those get aggressive segments that cut rather than polish. A thin worn paint may take one pass. A thick kit with two coats of topcoat may take three, with tooling swaps in between.

Some floors get shot blasted instead. A shot blaster throws steel media at the slab and recovers it, and it moves faster than grinding on wide open floors with heavy buildup. It leaves a coarser profile, which suits thick-build systems. It cannot reach walls and corners, so a blasted floor still needs edge grinding around the perimeter.

What we do not do is chemical stripping. Strippers soften the old coating into a slurry, and that slurry goes exactly where you do not want it, down into the pores. You scrape off what you can see, the slab looks clean, and a film of dissolved residue sits in the surface waiting to reject the next coat. Then you still have to grind, only now on a contaminated slab. The same logic drives the prep behind our Arvada concrete polishing work, where a clean mechanical profile is the whole foundation of the finish.

The Hidden Cost Is Time

Homeowners assume an old coating means more product. It does not. The pails cost the same either way. What a previous coating buys you is hours: more grinder passes, more tooling wear, more vacuum bag changes, more hand work around the door track and the step into the house. On a bare, never-coated slab, prep is a fraction of the day. On a two-car garage with a failing kit and a band of porch paint around the perimeter, prep eats the whole morning. That is why we want to see the floor in person before saying anything about the schedule.

When the Old Layer Can Stay

It happens. Occasionally we walk into an Arvada garage with a professionally installed coating that is dated and completely sound. Tape test clean everywhere, no peeling at the corners or the threshold, no powdering, no hollow sound when you tap it. That layer can sometimes be abraded rather than removed, giving the new system a profile to grab. It is rare, we never plan on it, and we confirm it on the floor rather than from a photo.

Moisture Gets Read After Removal, Not Before

One piece of sequencing matters more than most. Moisture moving up through a slab is a real cause of coating failure in Colorado, especially in garages on the older cut-and-fill lots around Arvada where drainage was handled differently than it is today. But you cannot read moisture through a coating. Whatever is on the floor acts as a partial vapor barrier, so a meter on a coated slab tells you about the coating, not the concrete.

The order is fixed: remove, clean the dust, then test the bare slab. If the numbers come back high, that changes what goes down, usually a moisture-tolerant primer under the build coats. Guessing early is how a floor ends up bubbling six months later. Everything we handle around town is laid out on our Arvada service page.

Common Questions From Arvada Homeowners

Can you grind off the loose parts and leave the rest?

No. Spot removal leaves two surfaces with two different bond strengths, and the seam telegraphs through the finish. Everything comes off so the new system sits on one consistent profile.

How messy is grinding off an old coating?

Less than people expect. Our grinders run to a HEPA dust extractor, so the work is close to dust-free. We seal the doorway into the house and cover anything staying in the garage.

I already tried a stripper on part of my floor. Did I ruin it?

Almost certainly not. It means extra grinder passes to cut past the residue that soaked in. We test the bare slab afterward to confirm it is taking water normally.

Does removal add a day to the job?

Usually not. Most Arvada residential garages with an old coating still finish in one day, with removal taking the morning. Heavy buildup across a three-car garage is where we schedule two days.

Can I tell what I have from a photo?

Sometimes, and we are happy to look at one. Peeling sheets read clearly in a picture. Sealer does not show up at all. The tape and water tests tell you far more.