Answers to Common Questions About Slab Lifting

We get a lot of calls from property owners or managers with slab issues after their internet searches lead them to our website. What follows are the most common questions we hear from property owners or managers interested in slab lifting, along with the most accurate answers.

1. How strong is your slab lifting foam?

The AP Lift Foam we use can support up to 14,000 lbs per sq ft. That’s in a free rise state. Underneath a slab it will be many times stronger than that.

2. Have these types of products been specified by DOTs?

Yes. In the later 1990s various Departments of Transportation started testing high density foams underneath bridge approach slabs. These polymers have proven to hold up and are now used by just about every DOT in the United States to support highway loads.

3. How long will the installed foam last?

Polyurethanes are made from derivatives of oil and natural gas. Their lifespan is similar to that of plastics. They have high chemical resistivity and should last a hundred years.

4. What if you over lift?

The lifting is done in a very controlled manner, moving the slab millimeters at a time. A trained slab lifter is usually able to get within one eighth of an inch tolerance.

5. Can the foam lift a very thick slab or a slab with a piece of equipment on it?

Yes that is not a problem. If you run the math and apply PSI (pounds per square inch) over square feet you’ll realize that it doesn’t take very much pressure to lift something heavy.

6. Is the foam safe for the environment?

The polyurethane foam we use does not shrink, degrade, or leach anything into the environment. Some are even NSF certified for contact with drinking water.

7. How is the foam used in a warehouse or industrial facility?

In industrial facilities or warehouses, polyurethane foam is used to stabilize rocking slabs, to lift sunken slabs, to fill voids beneath slabs both in and outside the building, and to fill massive voids that occur right behind loading dock walls.

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