What should you do about the sunken concrete in your driveway?

If you’re noticing cracks or sagging in your concrete slab, do not lose heart, thinking that your only option is an expensive new pour. A new slab may also not address any underlying issues.

Let’s take a look at the methods that are available to fix this issue.


Mudjacking, also known as slab jacking or pressure grouting, uses a finely crushed limestone aggregate mixed with water to form a slurry. Once mixed, it is poured through 2-inch holes in the slab and essentially fills any voids under the slab that have been created through erosion or soil compaction. Once filled, more mixture is pumped to “lift” the concrete at a proper level.

Unfortunately, because of its heavy consistency, there is no guarantee further settling won’t take place in the future. There is also a long cure period before the cement can be made of use.

Foam Injection

Polyurethane foam injection is a closed cell polymer, meaning unlike an open-cell foam (i.e sponge which is porous) this is closed-cell, which closes gas pockets, essentially sealing from one another and preventing water from being soaked up.

The process is the same as mudjacking, but the entry-points are much, much smaller: the size of a dime. The foam expands under the slab, filling every possible void, and the cement lifts.

It’s lighter than a mud-mixture, not disturbing the soil underneath, and thereby prevents further settling. Any foam that escapes sets quickly, sealing that hole. It cures within 15 minutes and the slab is ready for use in as little as 30 minutes.

There are many benefits to choosing Polyurethane Foam Injection over mudjacking: 

·      Foam retains its shape and volume for an indefinite period of time.

·      Shorter cure-time (30 minutes).

·      Much smaller entry-points (dime-sized).

·      Expands into voids much smaller than with mudjacking.

·      Lighter than mud, therefore less disturbing to underneath soil.

Regardless of the option you think is best, it’s always wise to seek the opinion of a trusted professional. We at Streamline pride ourselves on the work we do when it comes to leveling concrete. We specialize in the polyurethane foam option and guarantee it to be a better long term solution in repairing your sunken concrete. Give us a call today for your free estimate!

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