Case Study Concrete Slab Floor Lifting for PA Middle School

Problem

A concrete classroom floor at a Pennsylvania middle school had settled significantly over time. The difference in elevation was noticeable, with a clear drop when walking from one side of the room to the other. The uneven floor posed safety concerns and the school was committed to maintaining the building’s structural integrity as part of ongoing improvement efforts.
The middle school needed a fast and efficient solution to correct the issue during summer break while multiple maintenance projects were underway.

Solution

Utility Services Group (USG) addressed the issue using Terrathane 24-010, a dual-component polyurethane with exceptional lifting properties. The team applied a combination of deep soil injection and under-slab injection methods to ensure comprehensive support and stabilization of the slab. The polyurethane foam expanded to fill voids beneath the floor, restoring the slab to its original level.
This method was chosen for its speed and precision, allowing USG to lift and stabilize the floor without the need for extensive demolition or prolonged downtime.

Results

USG successfully lifted the floor slab back to a level grade, eliminating the uneven surface. The entire project was completed in just one day, making it an ideal solution for the school’s tight summer maintenance schedule. The process caused minimal disruption to other contractors working in the building, allowing all maintenance projects to proceed smoothly.