Concrete leveling can last for many years, but how long it holds depends on the soil and drainage under the slab, the condition of the concrete, the method used and whether the cause of the settling has been addressed. No leveling method can guarantee that the ground will never move again.
Leveling lifts the slab and fills spaces beneath it. If the conditions that caused it to sink are still present, the slab may settle again over time.
What Helps Leveling Last
Stable soil, good drainage and a slab in sound condition give leveling the best chance of lasting. When water is directed away from the concrete and voids are fully filled, the slab has more even support.
The method and how carefully it is done also matter. Both slurry-based and foam leveling can perform well on suitable concrete when done by experienced crews.
Filling the space under the slab well is part of what gives it support, which is why experience matters.
What Can Shorten Results
Water is one of the biggest factors. Downspouts that empty under slabs, poor grading and soil that washes out can create new voids. In Michigan, freeze-thaw activity can also affect soil under outdoor concrete.
Other factors may include soft or poorly compacted soil, nearby excavation, heavy loads the slab was not designed for and concrete that is already cracked or deteriorating.
The cause of settling should not be assumed from appearance alone. A closer look at the site helps identify what may be affecting the concrete.
Trees, irrigation and changes to the yard over time can also affect moisture levels near concrete.
Protecting a Leveled Slab
Extend downspouts, check grading, seal joints and cracks where appropriate and watch for water collecting near the concrete. These steps can help limit the conditions that lead to new settling.
Watching the slab after a hard winter or heavy rain season can also show whether it is staying put.
Keeping heavy equipment, dumpsters or large vehicles off sidewalks and patios that were not built for them can also help.
When Leveling May Not Be the Best Choice
If a slab has sunk repeatedly, is badly cracked or has ongoing drainage issues, concrete replacement with a corrected base may give a longer-lasting result. A professional evaluation can help compare the options.
Asking a contractor what they expect for your specific slab, and why, is more useful than a general number.
Keeping notes on when the work was done and any changes you notice afterward can also help if questions come up later.
If you are considering leveling and want to know what to expect for your concrete, an on-site evaluation can help. Learn more about our concrete leveling work in Kalamazoo, or call (269) 404-2457.
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