is a method of concrete lifting using foam injection lifters. This is an alternative method to mud jacking for raising concrete. Instead of injecting a grout mix (referred to as slurry) into the slab, this lifting method injects polyurethane foam to lift and level the concrete. Both processes of concrete raising are respectable methods, and each have their advantages and disadvantages.
The main ingredients of polyurethane are isocyanates and polyols. The EPA lists these as toxic substances, and both of these are byproducts from petroleum, or crude oil. Because of this fact, Polyurethane is not accepted at recycling centers, and must be disposed of at a toxic waste facility, which can incur additional costs and expenses.