Polished concrete - Levels & Classes Explained
Introduction: What is Polished Concrete?
Polished concrete has become a popular flooring solution in industrial, commercial, and even residential spaces due to its durability, low maintenance, and sleek appearance. The process involves grinding, honing, and polishing the concrete surface using progressively finer abrasives to achieve different levels of sheen and aggregate exposure.
Understanding the distinctions between sheen levels (1-4) and aggregate exposure (A-C) is crucial for selecting the right finish based on aesthetic preference, functionality, and maintenance needs.
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Polished Concrete Sheen Levels (1-4)
The sheen level of polished concrete refers to how much light reflects off the surface, impacting its glossiness and appearance. The level is determined by the grit of the final polishing step.
Level 1 – Matte Finish (100-200 Grit)
🔹 Minimal light reflection, a soft and subtle sheen.
🔹 Surface appears smooth but retains a natural concrete look.
🔹 Best for industrial settings or areas where slip resistance is a priority.
🔹 Typically achieved using a 100-200 grit resin-bond diamond tool.
Level 2 – Low Sheen (400 Grit)
🔹 Slightly more reflective but still has a satin/matte finish.
🔹 Some light diffusion occurs but doesn’t create a high gloss.
🔹 Ideal for warehouses, garages, and commercial settings looking for a balance between aesthetics and function.
🔹 Achieved with a 400-grit polishing process.
Level 3 – Semi-Gloss Finish (800 Grit)
🔹 Noticeable light reflection and a soft mirror effect.
🔹 Common in retail, offices, and residential applications where a higher-end look is desired.
🔹 Offers good stain resistance with proper sealing and densification.
🔹 Achieved by polishing up to 800 grit.
Level 4 – High-Gloss Finish (1,500-3,000 Grit)
🔹 Maximum light reflectivity, creating a true mirror-like shine.
🔹 Popular in showrooms, high-end retail, and commercial spaces.
🔹 Provides a luxurious, high-end appearance with excellent durability.
🔹 Achieved using 1,500-3,000 grit polishing pads.
Aggregate Exposure Levels (A-C)
Aggregate exposure refers to how much of the underlying concrete material (stones, sand, and cement) is revealed through grinding. This depends on the depth of the initial grinding step and contributes significantly to the final aesthetic.
Class A – Cream Finish (Minimal to No Aggregate Exposure)
🔹 The surface is lightly polished without deep grinding.
🔹 Retains the natural cement color with little to no visible stones.
🔹 Smooth and contemporary look, ideal for retail and modern spaces.
🔹 Works best on well-placed, high-quality concrete slabs.
Class B – Fine Aggregate Exposure
🔹 Slightly more grinding reveals fine sand and small stone aggregates.
🔹 Creates a subtle speckled appearance.
🔹 Offers a mix of durability and decorative appeal, common in commercial settings.
Class C – Large Aggregate Exposure
🔹 Heavy grinding exposes the deeper layers of large aggregate stones.
🔹 Highly decorative with a terrazzo-like effect.
🔹 Often used in high-end architectural designs and statement floors.
Our Polished Concrete Process
At Floor Logic Pro, we follow a meticulous step-by-step process to ensure the best results:
Grinding & Surface Prep – We begin by mechanically grinding the concrete using industrial-grade diamond tooling to achieve the desired aggregate exposure.
Joint Filling & Crack Repair – We fill control joints and cracks with high-quality polyurea or epoxy joint fillers to create a seamless, long-lasting surface.
Honing & Densification – We apply a densifier to harden the surface, increasing resistance to wear, stains, and moisture penetration.
Polishing & Sheen Enhancement – We progress through finer grits (up to 3,000) to achieve the desired sheen level, ensuring a smooth, reflective surface.
Optional Staining & Sealing – For added color and protection, we can apply concrete stains and sealers.
Burnishing (if required) – A final high-speed burnish can enhance the gloss and longevity of the floor.
Why Choose Polished Concrete?
✅ Durability – Resistant to heavy traffic, impacts, and wear.
✅ Low Maintenance – Easy to clean with minimal upkeep costs.
✅ Cost-Effective – Long lifespan compared to other flooring options.
✅ Aesthetic Appeal – Customizable with different sheen levels and aggregate exposure.
✅ Eco-Friendly – No harsh chemicals needed, and it improves light reflectivity, reducing energy consumption.
Get the Perfect Polished Concrete Floor with Floor Logic Pro
Whether you need a high-gloss polished concrete floor for a showroom or a matte finish for an industrial space, we have the expertise to deliver a flawless result.
Contact us today to discuss your project and get a custom quote!