Polished Concrete Sheen: Levels, Gloss and What to Specify

Polished concrete sheen is how sharply a floor reflects the room above it, and the industry sorts it into four levels, from flat to highly polished. The level comes from how fine the diamond abrasives go during grinding. It does not come from a glossy coating on top. If you are planning a floor, the useful move is to name a level and ask the contractor to measure it.

Below, we explain what each level looks like, which numbers matter, why a floor can look shiny and still be poor, and which level suits a Texas garage.

TL;DR

• There are four sheen levels in the Concrete Polishing Council (CPC) chart: flat/ground, satin/honed, polished and highly polished.
• Sheen is measured, mainly as Distinctness of Image (DOI), with gloss as an optional second reading and haze as the quality check.
• Real sheen comes from stepping through diamond grits and densifying. A topical sealer can fake a shine that fades.
• For most home garages, a mid-level sheen with a durable protective system is more practical than a mirror finish.
• Put the level, the aggregate exposure and the measuring method in your written estimate.

Table of Contents

• The four sheen levels, side by side
• DOI, gloss and haze: the three readings
• Where real sheen comes from
• The false shine problem
• Which sheen level suits a garage?
• When polishing is not the right answer
• Our perspective: prep decides the sheen
• How to specify polished concrete in writing
• Maintaining the sheen
• Looking at your garage floor?
• FAQ
• Sources

The four sheen levels, side by side

The CPC appearance chart dated February 2026 defines four levels. The numbers below are the chart’s average values.

All levels aim for a haze index under 12. Haze is the milky cloudiness inside a reflection.

Two things stand out. The levels are bands, not single points, so two Level 3 floors can look a little different. And the gloss column overlaps between levels, which is one reason DOI is the primary measure.

Level 1: flat or ground

This is concrete that has been ground enough to open the surface and then stopped. It looks like a clean, honest slab. It suits workshops and back-of-house spaces. In a house it is rarely the final look, because the surface still takes stains unless it is densified and sealed.

Level 2: satin or honed

Level 2 is a soft sheen. You can tell the floor is smooth and cared for, but you cannot read a window or a ceiling light in it. It hides tire marks and scuffs better than the higher levels, and that makes it a sensible match for working garages.

Level 3: polished

This is the level most people picture when they say “polished concrete.” Overhead lights show up as defined shapes, and the floor looks finished without feeling like a showroom. It asks for finer resin-bond grits and a bit more time on the machine.

Level 4: highly polished

At Level 4 the floor reflects like a lightly clouded mirror. It looks dramatic in a living space and shows every footprint, wheel scuff and chemical etch. It costs more in labor because every earlier grit has to be done perfectly.

DOI, gloss and haze: the three readings

The sheen conversation gets muddy because people use “gloss” for everything. They are separate measurements.

DOI (Distinctness of Image) is how sharp the reflection of an object is, sometimes called image clarity. The CPC treats it as the main yardstick. It is measured to ASTM D5767, and a hazy floor can post a decent number here and still look off to the eye.

Gloss is how much light bounces back at a set angle. The CPC chart lists it as optional. A floor with a gloss reading but poor DOI looks shiny and blurry at once.

Haze is the cloudiness, measured to ASTM D4039. It is the number homeowners overlook most, and it is the one that catches shortcuts. The American Society of Concrete Contractors explains how to use CPC classes and levels in a specification, and it makes the case for measuring against a defined result rather than an ambiguous “shiny.”

A practical way to say it in an estimate

Instead of “high gloss polished concrete,” ask for wording like this: “Level 3 sheen per the CPC chart, measured for DOI and haze before any topical sealer is applied, on a defined number of test spots.” It is not complicated, and it turns a taste question into a deliverable.

Where real sheen comes from

Polished concrete is a progression. Diamond tooling starts coarse, with metal bonds that open the surface and expose the cream or aggregate, and then moves to finer resin bonds. Each step removes the scratches of the one before.

The ARDEX polished concrete specification is a good picture of how a spec writer thinks about this. The rule of thumb in the industry is that each grit should be no more than double the one before. Jump from 100 straight to 400 and you leave scratches that finer pads will not remove. They show up later as dull streaks that no later step can erase.

A typical sequence, in plain terms:

1. Grind with coarse metal-bond diamonds to remove the surface layer, coatings or glue and reach the depth you chose.
2. Refine with progressively finer metal and hybrid steps to erase the previous scratches.
3. Apply a densifier so the surface hardens and stops dusting.
4. Polish with resin-bond pads, 800 grit then 1500 or 3000 depending on the sheen level you want.
5. Apply a guard or penetrating sealer for stain resistance.

The finer you stop, the lower the level. Stopping around 800 gives you a satin look. Going to 1500 or 3000 pushes toward Level 3 or 4.

What the slab itself contributes

Grit does not do all the work. Concrete mix, the water-cement ratio and curing all affect how well a slab takes a polish. The American Cement Association guidance on protective treatments for concrete points to a water-cement ratio that should not exceed 0.45 by weight for durable concrete. A weak, wet-mixed slab can reach a high sheen on paper and still wear down quickly under traffic.

Existing garage slabs are the harder case. Older builder-grade slabs often have trowel marks, patched cracks, oil spots and uneven aggregate. These show through a polish. They are why we tell homeowners early that their slab decides the achievable look.

The false shine problem

Some floors are made to look glossy with a film-forming topical sealer laid over incomplete grinding. It looks good on the day. Then traffic wears the film, scratches show, and the floor goes cloudy.

The CPC-based guidance in the ASCC article above is blunt about the fix: measure sheen before the topical sealer goes on. If the number is right without it, the polish is real. If it only works with the sealer, the grinding was not finished.

How to spot it yourself:

• Look at reflections, not shine. Stand at the far end and look at a ceiling light. A sharp edge means high DOI. A fuzzy, milky glow means haze.
• Ask what the last mechanical step was. “800 grit resin” or “1500 grit” is an answer. “We finish with a high-gloss sealer” is a flag.
• Ask for a test area. A small section finished before the full job lets you judge the look in your own lighting.

On sealing generally: concrete stays porous after polishing, so a penetrating sealer or densifier still matters for stain resistance, as the ARDEX specification above covers. It is part of the system. It is not a way to buy sheen.

Which sheen level suits a garage?

Garages are not showrooms. Cars drip oil, hot tires pull on the surface, road salt and grit get tracked in, and in Texas the slab goes through heat and humidity swings. Here is how we think about it:

The link between sheen and slip is also worth a thought. Glossier floors feel slicker when wet. If you walk across the floor in sandals after a car wash, a lower sheen or an added texture is kinder. Our page on gloss versus matte garage floors goes through that tradeoff.

When polishing is not the right answer

Mechanical polishing needs sound, clean, reasonably consistent concrete. It struggles when the slab has:

• deep oil saturation that grinding will not reach,
• heavy patching and repaired cracks that will not take a polish evenly,
• moisture moving up through the slab,
• uneven aggregate or old coatings that change how it grinds.

In those cases, a decorative coating is often the better-performing floor. The American Cement Association FAQ on decorative finishes lists polish alongside colors and textures as one option among several for concrete surfaces. Epoxy, solid-color systems and metallic finishes can give a similar look, and they handle the issues above more forgivingly. The tradeoff is that they are chemically applied, not mechanically refined, so the character is different.

We lay out the decision in more detail in when polished concrete makes sense for home garages, and compare cheaper floor options in tiles, paint or epoxy.

Our perspective: prep decides the sheen

We work on garage floors across Conroe and the North Houston area, and the pattern is consistent: floors fail or disappoint because of what happened before the finish went on, not the finish itself.

Our process starts with mechanical diamond grinding, crack and pitting repair and moisture testing. That order matters for polished concrete just as it does for a coating. If the slab is not ground evenly and the cracks are not properly repaired, no sheen level will look right, and the floor will show it under garage lighting.

When a homeowner asks us for “the shiniest option,” we ask three things first. How do you use the garage? Has the slab had oil, paint or old coatings on it? Do you want a look that holds up, or one that photographs well for a month? Honest answers usually lead to either a modest-sheen polish done properly, or a coating system with decorative flakes and a UV-stable polyaspartic topcoat that is built for Texas conditions.

We would rather tell you a slab is a poor candidate for polishing than sell you a gloss that fades. As an owner-operated company we oversee the work directly, and our residential work carries a 15-year warranty.

— William

How to specify polished concrete in writing

Use this list when you collect estimates:

1. Sheen level. Name the CPC level (1 to 4), not an adjective.
2. Aggregate exposure. The CPC also classifies how much stone shows: cream, salt-and-pepper or rock-cut. Pick one, because it changes depth of grinding and how the floor looks.
3. Measurement. Ask how DOI and haze will be measured, and when. Before topical sealer is the right answer.
4. Last mechanical grit. Get the final resin-bond grit in writing.
5. Densifier and sealer. Ask what is used and whether it penetrates or forms a film.
6. Repairs. Ask how cracks, pits and joints will be handled and how they will look afterward.
7. Slab condition. Ask for a moisture test result, and ask what happens if it fails.
8. Curing. On a new slab, ask the contractor how long the concrete has cured. The industry guidance in the research above puts a minimum of 24 to 72 hours before polishing, and many installers wait far longer.

A contractor who answers these clearly is probably doing real work. One who keeps steering you back to “high gloss” may be planning to cover gaps with sealer.

Maintaining the sheen

Polished floors are easy to clean, but a few habits protect the look:

• Dust-mop or soft-broom grit away often. Grit is what scratches a polished surface.
• Use a pH-neutral cleaner. Acidic cleaners and harsh degreasers can etch it.
• Wipe oil and fluids soon, even though a good sealer buys you time.
• Use mats at the garage door and under parked vehicles if you want to preserve a high level.

Over years, traffic lowers sheen in the paths you use most. A light re-polish or re-guard can bring it back. A floor that was only film-sealed needs the film redone instead.

Looking at your garage floor?

If you want a polished look and want to know whether your slab can deliver it, we start with an inspection and a written estimate. We install polished concrete, metallic epoxy, solid-color and full-flake systems, with polyaspartic protection where it makes sense. See our garage floor coatings in Conroe, TX, or check published per-square-foot coating pricing, which lists garage floor coatings at $4.50 to $7.50 per sq ft.

FAQ

What is the difference between sheen and gloss in polished concrete?

Sheen is the overall look of the floor’s reflectivity, and the CPC divides it into four levels. Gloss is one measurement, the amount of light reflected at an angle. DOI, the sharpness of reflections, is the primary measure, and haze checks for cloudiness.

Which polished concrete sheen level is best for a home garage?

For a garage that parks cars daily, Level 2 or a conservative Level 3 is usually the practical choice. Both hide wear better than a mirror finish. Go higher only if the space is more of a showroom than a workspace.

Does polished concrete need a sealer?

Yes. Concrete stays porous after polishing, so a densifier and penetrating sealer are needed to resist staining and moisture, as the ARDEX specification outlines. The sealer protects the floor. It should not be what creates the shine.

What is a cheaper alternative to polished concrete?

Decorative coatings such as solid-color epoxy, metallic epoxy or flake systems with a protective topcoat can give a similar clean look. They are applied chemically rather than ground to a finish, and they often cope better with oil staining and moisture in a garage.

Sources

• CPC Exposed/Polished Concrete Appearance Chart, February 2026
• How to Use CPC Classes and Levels to Specify Polished Concrete, American Society of Concrete Contractors
• ARDEX K 520 Polished, Section 03 54 00
• Cement & Concrete FAQ, American Cement Association

Recommended

• Prep First, Not Sheen: Gloss vs Matte Garage Floors
• Don’t Skip Prep: When Polished Concrete Makes Sense for Home Garages