Thornton Mudjacking

You can spot most of our lifting work from the car. A front walk that dips through the middle so the panel lines read like a shallow smile. An apron sitting lower than the garage floor with a dark shadow line across the joint. A porch pad that has pulled a finger-width gap away from the brick. None of that needs a tape measure.

What it means is simple: the concrete stayed put and the dirt underneath went somewhere. That's the whole diagnosis, and it's good news, because sound concrete over an empty pocket is precisely what a slurry pump exists to fix. We drill a pattern of holes, push a sand and cement grout under the panel at low pressure, fill the hollow, and float the slab back up to the line it used to hold.

What a hammer and a steel probe tell us before anything gets drilled

Reading a Thornton block from the sidewalk

Eastlake holds the oldest concrete we touch in this city, and the tell there is nearly always the front walk. Those panels went on graded native soil with no base course beneath them, and they've had plenty of winters to work with. From the curb you see a walk with a panel or two riding low and a stair-step at every joint.

Quail Valley and Hunters Glen show a different signature. The drives and aprons there are wide, and what drops is the outer edge, the one farthest from the garage, because roof runoff and sprinkler overspray have been carving at that base for decades. Stand in the street and sight down the apron. If the far corner dives, you've found the void.

North Creek Farms is newer and the settlement there is almost always trench-related. Service laterals got backfilled during construction, that soil kept consolidating on its own timeline, and any walk poured across the line rode down with it. Small hollow, tidy lift.

What has to be true before the pump comes out

• Sound concrete on top, because we raise slabs, not rubble
• Three inches of thickness at minimum, confirmed at a test core
• Ground dry enough to take extra weight without surrendering more
• A hollow we can reach, mapped by sounding instead of guessed at
• Irrigation, low-voltage runs, and sleeves located under the work
• A plan for the water that dug the hole, or we're back in a few years
• Nothing bolted rigid to the house fighting the panel upward

Weight, frost, and where slurry stops being the answer

Grout is heavy. That's both the reason it works and the boundary on where it belongs. Washed sand, portland cement, water, mixed loose enough to travel and stiff enough to stay together. A cubic foot weighs north of a hundred pounds once it sets, so filling a hollow puts real mass back into ground that was holding nothing but air a minute earlier. Over the firm clay under most of this city, no issue. Over soft, saturated, or organic soil, real issue, and we say so rather than sell a lift that goes back down.

The season question comes down to one word. Frost. Slurry has to shove aside whatever occupies the space under your slab, and frozen soil doesn't shove. Push grout against a frost lens and you either accomplish nothing or you crack the panel you came to save. So we read ground condition, not the calendar. Late summer through fall is the sweet stretch: irrigation tapering off, soil dried down, hollows at their most obvious, and the trip hazard gone before shovel season.