Knowing the usages and limitations of foam is what differentiates the good slab lifting companies from the bad ones. There is a lot that goes into understanding the mechanical aspects and the foam make up. A bad mix and/or improper install can make an uneven concrete pad even worse. When trying to figure out the right company to pick for this type of work make sure they know how every component of the slab lifting trade works, not just the moving of concrete.
There can be multiple reasons why a concrete slab or pad has sunken or shifted. These could include an improper prep of the base prior to the install of the concrete, water erosion or heavy loads compressing it down. We have even seen problems because of animals tunneling under the concrete. Whatever the reason is for the problem our polyurethane lifting solution can help.
We are often asked why we don’t do the old way of lifting concrete with grout. There are a few different reasons. The first one is the weight of the product itself. A cubic foot of grout weighs approx. 108lbs. A standard lifting foam only weighs 4lbs a cubic foot- a significant difference. If the soil already had issues due to compression, then putting that much more weight on the soil could increase the sinking/settling issues.