When you’re looking into lifting concrete, there are going to be a few different options for repair, and polyurethane foam injections are going to be one of the best ways to accomplish this. That’s because it’s a mix of different elements that, when combined, expand to substantially more than their initial mass, then harden very quickly. At their core, polyurethane foam injections work well because they don’t need a lot of time to set but they’ll still maintain a lot of weight. You don’t have to worry about whether they’re “as effective” as more invasive options like slabjacking or mudjacking. They’re at least this effective, and in many cases, they’re more effective.