Types of Concrete Leveling & Polishing Systems

When evaluating concrete surface preparation, subfloor restoration, and floor finishing, leveling and polishing methods are categorized by depth of cut, aggregate exposure, Sheen level, and material chemistry.

1. Types of Concrete Leveling (Subfloor Restoration & Surface Prep)

Subfloor leveling corrects unevenness, sloping, pits, and structural imperfections prior to diamond polishing or applying protective resinous coatings.

A. Self-Leveling Cementitious Overlays (SLUs)

Polymer-modified cementitious mixtures are poured over compromised or uneven subfloors to achieve a dead-level surface.

• Underlayment Levelers: Applied as a flat base layer strictly beneath secondary floor coverings like tile, luxury vinyl plank, or hardwood.
• Wear-Topping Levelers: Polishing-grade self-leveling overlays designed to act as the final decorative floor surface, which can be dyed, ground, and mechanically polished.
• Internal Link: Learn more about our specialized subfloor prep via our Self-Leveling & Concrete Overlay Services.

B. Mechanical Surface Grinding & Milling

Utilizing high-torque rotary floor grinders equipped with metal-bond diamond segments or scarifiers to physically mill down high spots, lipage, and subfloor humps.

• Internal Link: View our heavy-duty Concrete Surface Preparation & Diamond Grinding capabilities.

C. Polyurethane Foam & Slab Raising

Injecting expanding structural polyurethane foam or cement slurry beneath sunken or unlevel concrete slabs to raise them back to grade without demolition.

2. Types of Concrete Polishing (By Aggregate Exposure Level)

According to industrial standards, mechanical concrete polishing is divided into 4 distinct aggregate exposure levels depending on how deep diamond abrasives grind into the concrete matrix:

[ Cream / No Exposure ]  -->  [ Salt & Pepper ]  -->  [ Medium Aggregate ]  -->  [ Full Aggregate ]
      (0–0.5 mm)                 (1–2 mm)                (2–3 mm)                 (3–5+ mm)

Level 1: Cream Polish (Surface Polish)

• Depth: 0 – 0.5 mm
• Visual: Polishes only the ultra-fine surface cream without exposing structural sand or gravel. Delivers a smooth, cloud-like, uniform aesthetic with natural slab shading.

Level 2: Salt-and-Pepper Exposure (Fine Aggregate)

• Depth: 1 – 2 mm
• Visual: Light diamond grinding removes the cream layer to expose tiny sand grains and fine aggregate particles. Ideal for hiding everyday dust and minor wear in high-traffic zones.

Level 3: Medium Aggregate Exposure

• Depth: 2 – 3 mm
• Visual: Deepens the cut to reveal a balanced blend of fine sand and medium stone aggregates across the floor.

Level 4: Full Aggregate Exposure (Deep Grind / Terrazzo Style)

• Depth: 3 – 5+ mm
• Visual: Heavy diamond grinding exposes large structural gravel, river rock, and stones. Delivers a bold, speckled aesthetic similar to traditional cementitious terrazzo.
• Internal Link: Explore our full range of Aggregate Exposure & Mechanical Concrete Polishing.

3. Types of Concrete Polishing (By Sheen & Reflection Grade)

Polishing levels are also classified by surface gloss, dictated by the final resin-bond diamond grit size used during processing:

4. Specialty Surface Sealing & Protection

To preserve newly leveled and polished concrete floors, essential post-processing treatments are applied:

• Penetrating Densification: Applying liquid lithium densifiers to harden the concrete matrix from within, eliminating concrete dusting and boosting abrasion resistance.
• Stain Protectors & Guard Sealers: Micro-thin penetrating barriers that shield polished concrete against oil, chemical spills, and moisture drive.
• Internal Link: Protect your floor investment with AK Level & Polish Sealing & Densification Solutions.