Settled Concrete: Poly or Mudjacking?
Settled concrete can be unsightly and a trip hazard. The two most common ways of resolving this problem are mudjacking and polyurethane injections. So what’s the difference between the two?
Poly injections and mudjacking both use ports to inject material to lift the concrete. Polyurethane injection ports are smaller (usually 5/8”) while mudjacking ports are larger (usually1” to 1.5”).There are less ports required for poly injections because the foam spreads, whereas mudjacking injects slurry (a mix of water, soil, sand, and cement). Slurry requires more often unsightly larger ports in order for the void to be completely filled. Once the ports are filled the curing time begins. Polyurethane cures in about 15 minutes while slurry takes several days to cure.
Once the fill has cured your settled concrete is fixed! What about follow up maintenance? Because mudjacking slurry includes soil, sand, and cement it will erode over time. It also will put quite a bit of pressure on the soil because the average amount used in the process often weigh several hundred to thousands of pounds, which could cause new voids. Polyurethane foam does not retain moisture and doesn’t erode. It also weighs less than concrete slurry which reduces chances for new voids to form.
What about cost? Polyurethane is long lasting and a sometimes a slightly more expensive fix of the two. Mudjacking, although typically less expensive, will likely require more follow up maintenance (which could cost more money in the future). If you want a long term solution to settled concrete polyurethane is the way to go!