Spray foam can be used in geotechnical stabilisation
Spray foam can be used in geotechnical stabilisation behind concrete block walls as a lightweight way to fill voids, reduce water movement, and improve soil support. When sprayed behind a wall, expanding polyurethane foam can bind loose soils and increase their stiffness, helping to reduce lateral pressure on the wall. This can improve overall wall stability, limit bulging or cracking, and provide a faster, less invasive alternative to traditional re-compaction or drainage repairs. However, its effectiveness depends on proper application and site conditions, and it is generally used as a targeted remediation method rather than a full replacement for structural wall design or drainage systems.