I am working on a one-story structure on concrete-slab floor in California. A portion of the foundation and the concrete-slab floor has settled and some of the walls have developed cracks. We are planning to raise the foundation and the concrete-slab floor (approximately 2 inches) to stabilize the foundation. In the past we have retrofitted this type of projects using "Compaction grouting" method, which uses actual cement grout. The contractor has proposed using "POLYURETHANE FOAM " instead of "cement grout". I did some research on the foam and some people were not happy with it. Is the "POLYURETHANE FOAM" as good as the traditional "cement grout" for densification of the soil and stabilization of the foundation?
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