Gemini said How Class and Sheen Affect Your Project’s Cost and Timeline

Choosing a deeper grind (like Class D) or a mirror-like finish (Level 4) isn’t just a stylistic choice—it significantly impacts the labor, tooling, and time required for your project.

1. Labor and “Passes”

The deeper the grind, the more “passes” the machine must make over the floor.

• Class A might only require two or three steps with fine-grit diamonds.

• Class D requires starting with extremely aggressive, heavy metal-bond diamonds to eat through the top layers of concrete. This can add days to a project as the crew must carefully ensure they reach a uniform depth across the entire slab.

2. Tooling and Diamond Consumption

Diamond segments are expensive consumables. Grinding down to Class C or D wears out these diamonds much faster than a surface-level cream polish. Additionally, reaching a Level 4 High Gloss requires progressing through every single grit level (from 40 up to 3000), meaning more sets of diamond pads are used per square foot.

3. Edge Work

This is the hidden cost of deep-grind projects. Large planetary grinders cannot reach the last two inches against a wall. If you choose a Class D finish, the crew must use hand grinders to match that deep aggregate exposure along every wall and in every corner. This is painstaking, dusty, and time-consuming work.

4. The “Flatness” Requirement

For a high-gloss (Level 3 or 4) floor to look good, the concrete must be incredibly flat. If the slab has “waves,” a high-shine finish will highlight those imperfections like a funhouse mirror. Achieving a deep, uniform aggregate exposure on a wavy floor often requires extra grinding to “level” the high spots before the actual polishing begins.