Understanding Concrete Slab Foam Jacking Techniques

If you have a sunken, unstable, or fallen concrete slab that needs to be raised, then you have the option of investing in a traditional technique called mudjacking. This involves the insertion of a special grout underneath the slab to lift it up. While mudjacking is quite effective, you can opt for something called foam jacking. Keep reading to learn what this is and how it can be beneficial.

What Is Foam Jacking?

Foam jacking is the process of lifting up a concrete slab by using a polyurethane foam. The foam is injected incrementally and is placed in a drilled hole. This hole is formed through the concrete slab and all the way down to the subgrade underneath. Most holes are relatively big at about five-eighths of an inch. When the hole is prepared, a port is added to the opening and inserted down the length of the hole. The gun used to inject the material is then attached to the port. 

When the slab is ready, polyurethane is injected into the opening so it can reach deep into the earth and underneath the concrete slab. Once injected, the polyurethane expands. Expansion occurs quickly and only takes about 15 seconds. Once the injected material expands, more polyurethane is injected. Injection occurs until the slab is raised the desired amount. Once the process is completed, the opening in the concrete is filled in. 

What Are The Benefits Of Foam Jacking?

If you need to decide between traditional mudjacking and foam jacking, foam jacking is much easier to complete. The foam does not need to be mixed at the time of application, since it is pre-mixed and ready to use when the injection guns are utilized. Also, the foams spread easily in the earth once inserted and fill in voids and move into spots around uneven soil. This is the case due to the liquid nature of the foam. Grouts are much thicker and unable to fill in small openings like the foam can.

Also, since the foam expands quickly, contractors can be more precise about raising. Rulers and other measuring tools are often used during the process to keep track of the raising and to make sure the concrete is lifted the appropriate amount. Typically, only one raising is needed to ensure level and supported concrete.

If you have concrete on your property that is uneven, speak with a raising professional to understand how the slab can be raised.

For more information, you will want to contact a company such as Canyonlands Concrete Raising, LLC.