Flooring · definition
A wear scale (Class 1–5) for glazed tile indicating suitable traffic level. Floors need at least Class 3; high-traffic entries Class 4–5.
Source: TCNA — Tile Abrasion Testing (ASTM C1027)
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.