An injection hole patch is the cement fill placed in the small drilled holes left behind after a concrete raising job, restoring a smooth, sealed surface.
In depth
Every slab-lifting method needs holes to deliver material under the concrete. The size is what varies. Polyurethane injection uses small ports around 5/8 inch, while traditional mudjacking requires holes of 1 to 2 inches. Smaller holes mean less visible patchwork and less impact on the slab.
A good patch is packed tight, finished flush, and reasonably color-matched. Exact color match takes time, since new patch material starts darker and blends as it weathers. On decorative or stamped concrete, port placement itself matters, because holes drilled in grout lines or pattern joints nearly disappear.
How Acme applies it. We patch every injection port before we leave, finished flush with the surface. On stamped and decorative concrete we plan port locations to hide within the pattern wherever possible.
Related terms: Injection Port, Polyjacking, Mudjacking, Slab Lifting
Frequently asked questions
Will I see the holes after concrete raising?
You will see small patched circles at first. They weather and blend over the following months, and on patterned concrete we hide ports in joints so most are hard to find at all.
Why are foam injection holes smaller than mudjacking holes?
Foam is delivered as a thin liquid that expands under the slab, so it only needs a 5/8-inch port. Slurry is thick and needs a much larger opening to pump through.