Short answer

Even minor slab deviations cause high-reach forklift instability, automated system misalignment, and safety hazards. We use high-pressure structural polymer injection to fill sub-slab voids and lift sunken concrete, restoring the precision-level surface required for narrow-aisle logistics and heavy equipment.

Dive deep

In a modern logistics center, the floor is industrial equipment. High-reach forklifts and narrow-aisle (VNA) vehicles operate to millimeter tolerances. A half-inch sink over a void can tilt a 30-foot mast dangerously, cutting picks-per-hour and creating immediate safety risk.

Slab sinking almost always traces to sub-grade failure—poorly compacted backfill or pumping from high water tables in the Kent Valley and Everett areas. Voids form under the slab; point loads from racking and machinery snap the unsupported concrete downward.

On site we survey floor elevation, probe for voids, and assess sub-slab moisture. Rip-and-replace is rarely the first answer. Structural poly-leveling injects high-density closed-cell polymer through small ports; it expands to fill voids and lift the slab with roughly 90% load-bearing capacity in under 30 minutes—unlike mudjacking, the material is waterproof and lightweight. Pouring self-leveling topping over a void without stabilizing the base only adds weight and accelerates failure.

When it applies

  • Warehouse or logistics floors with measurable settlement or trip hazards
  • High-reach forklift or VNA operations requiring tight flatness tolerances
  • Sub-slab voids from erosion, poor compaction, or hydrostatic pumping
  • Facilities needing repair with minimal operational downtime

When it does not

  • Minor surface cracks with confirmed continuous sub-grade support
  • Slabs requiring full replacement due to widespread structural failure
  • Above-grade platforms with no sub-slab void mechanism

What we do next

We map voids, lift and stabilize the slab, and address drainage if water caused the sub-grade loss. For warehouse floor leveling, see our commercial restoration company in Seattle.