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How Does Polyurethane Lifting Work?

Posted by Dalinghaus Construction on Nov 5, 2020 10:00:00 AM

Banner - How Does Polyurethane Lifting Work

Body - How Does Polyurethane Lifting WorkThis post is part of the Alchemy-Spetec Contractor Lens series, featuring views, news & case studies written by our customers.  This article, originally posted on the Dalinghaus Construction Blog, explains the basics of polyurethane concrete leveling.  If you're an Alchemy-Spetec customer and you'd like to discuss writing content for our blog, please send an email to today!

Lifting concrete with polyurethane is a process that takes a lot of simple physics into play.  The amount of recovery that you are able to get out of a slab of concrete is dependent on a lot of underlying factors.  Not only does the amount of area that is needing to be recovered play a role, but also the construction of the slab plays a massive role in what can actually be recovered.  Let's dive into how the process actually can lift a sunken slab of concrete.

When you are looking at a sunken piece of concrete you first have to envision of how this slab of concrete will react once you start the lifting process.  Once you do so, you can then figure out where you are going to perform you first injection.  We will then inject polyurethane through a drilled hole until we start to see movement out of the slab.  We continue drilling and injecting until the slab has been set back into place as it was when it was initially poured.

When the polyurethane is first injected through the slab it will typically fill any voids or cavities that are under the slab.  Once these have been filled the polyurethane will start to compact the soil that the slab was resting on.  It will continue to compact the soil until it gets to a point where the soil starts to become solid and the slab begins to lift.  The polyurethane will continue to compact the soil and lift the slab until the slab has been leveled to the desired elevation.  

It is a simple process if you think about it.  It is easier for the polyurethane to lift the concrete and its weight than to push and compact the soil further into the earth.  Although some looser soil requires more polyurethane to be injected, it will still eventually get to the point at which it is easier to lift the slab than to continue to push the soils downward.

Here are the steps simplified:

  1. Analyze the area to be lifted
  2. Drill a hole through the slab
  3. Install a polyurethane gun
  4. Begin injecting polyurethane material
  5. Monitor slab movement 
  6. Stop injection once recovery has been attained
  7. Remove gun and port
  8. Grout hole

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Topics: All Posts, Lift Slabs