Polyurethane Foam is specifically formulated, designed and manufactured for lifting concrete. The manufacturers provide different densities of foam to allow for the best application of polyurethane foam injection.
We use a 2 part Polyurethane Foam that is injected at around 1,300 psi and begins expanding in 8 seconds. Our foam can expand up to 24 times its size in volume and lift at a rate of 50 lbs per square inch...All in 15 seconds!
Mud Jacking is an art not a science. Meaning that with Mud Jacking you are lifting with a liquid so it is not always predictable. You may be planning to lift in a specific area but if there is a low area somewhere else under the concrete then that is the area that will build up pressure and lift first.
With Polyurethane Foam you have to create more smaller diameter holes but this allows you to lift at the exact place that is needed. This material also expands in 15 seconds to this allows you to better control the amount of lift.
So Polyurethane Foam Injection is a Science not an art.
Polyurethane Foam Injection is a shallow system, thus it is not a long-term repair because you are still bearing the load of the concrete in the active zone of the soils. If you are planning on supporting heavy loads, then a deep foundation system should be utilized like Helical Piles or Concrete Piles.
If your residence or building has been lifted with a deep system and you still have sagging interior floors, then polyurethane foam can work to lift the concrete.
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