You don’t level a warehouse slab for appearance—you level it to meet ASTM E1155 FF/FL tolerances that match your forklifts, racks, and automation. FF controls short-wavelength bumpiness; FL controls long-wavelength slope, and an intentional grade can still pass. When slabs settle, crack, spall, or dust, you lose wheel-track continuity, increase vibration, misalign racks, and drive downtime, wear, and claims. Laser profilometry quantifies risk, and the right jacking or overlay plan restores compliance—next you’ll see how.