Project Overview
RaiseRite Concrete Lifting was contacted to assess and resolve a floor settlement issue in a historic cathedral located in the Milwaukee area. The problem was discovered after a section of the interior floor—approximately 52 linear feet in length—had dropped between ¾ inch and 1½ inches. This shift left noticeable gaps between the floor and adjacent walls, raising concerns about both structural integrity and aesthetics.
Problem Diagnosis
Upon investigation, RaiseRite determined that the settlement was likely caused by compromised subgrade conditions. A leak originating in the cathedral’s roof had traveled down a structural pillar and infiltrated the subgrade in the affected area. This water infiltration appeared to have weakened the soil beneath the slab, leading to the uneven settling of the floor.
Solution and Approach
RaiseRite’s experienced team concluded that polyurethane foam injection would be the most effective method for addressing the issue. The benefits of polyurethane over traditional methods—such as its lightweight nature, rapid curing time, and precise control during lifting—made it particularly well-suited for a sensitive and historic structure like a cathedral.
A detailed proposal outlining the scope of work and the polyurethane leveling process was prepared and promptly accepted by the cathedral’s management.
Execution
RaiseRite mobilized shortly after proposal approval. Technicians drilled ⅝” holes through the concrete floor at strategic locations along the affected span. Using specialized equipment, they injected high-density polyurethane foam beneath the slab. As the foam expanded, it gently lifted the floor slab, effectively closing the gaps between the wall and the floor without causing damage to the surrounding structure.
Results
Duration: The entire project was completed in just one day.
Effectiveness: The floor was successfully lifted to its original elevation.
Impact: The gaps between the floor and walls were fully closed.
Usability: The floor was ready for full use immediately after the repair.
Conclusion
This project is a prime example of how RaiseRite Concrete Lifting delivers efficient, minimally invasive solutions for complex structural issues—even in historic buildings. The use of polyurethane foam not only resolved the floor settlement issue but also preserved the integrity and function of a treasured architectural space.
