Lone Tree Mudjacking

Two ways to raise a sunken slab, and most Lone Tree homeowners have already picked one before we've seen the concrete. Somebody's brother-in-law swears by foam. A neighbor got a mudjacking quote and it was half the price. Neither of those is a diagnosis.

Here's how we approach it. Mudjacking pumps a wet mix of sand, cement, and water through holes drilled in the panel until the slurry fills the cavity underneath and hydraulic pressure walks the slab back up to grade. It's an old method and it works, but it isn't the right answer everywhere, and the deciding factors have nothing to do with what a salesman told you. They're about what's under the slab, how much weight that soil can carry, and whether the concrete on top is still worth the effort.

How a slurry lift actually works

We drill ports through the panel, usually a hair over an inch and a half across, spaced so the pressure spreads evenly rather than bowing the middle of the slab. Then the pump goes to work. The slurry travels the path of least resistance, so it fills the low spots and washouts first, and only once the cavity is packed does the pressure start doing the lifting. That's the part people misunderstand. Filling comes first. Lifting is the last inch.

Our crew watches the panel with a level and a string line the entire time and calls the pump off in small increments. Rushing a lift cracks concrete, and a cracked panel is a replacement conversation you didn't need to have. When the grade's right, we plug the ports with a stiff mortar mix and cut the drips. The patches show. Anyone who tells you otherwise is selling.

Slurry, foam, or tear it out

Where slabs drop around town

Settlement follows water and it follows backfill. In RidgeGate and Montecito, where the houses are newer, we spend most of our lift days on the strip of walk or patio that sits over the foundation backfill. That ground was dug, replaced, and compacted in a hurry, and it keeps consolidating for years while the rest of the yard sits still. One panel drops. The one beside it doesn't. Classic.

Heritage Hills, Carriage Club, and the Fairways bring us longer runs. Big front walks, side approaches, wide drives, and the failures there usually trace to a downspout dumping at the slab edge or an irrigation line that ran wet for a season before anybody noticed. Fix the water first. We'll happily lift a panel, but if the same gutter keeps washing soil out from under it, you're buying the same repair twice.

Seasons, frost, and when we say wait

Lift season on the Front Range runs from thaw to hard freeze, roughly April into November. We need the ground unfrozen because frozen soil can hold a slab up temporarily and give a false reading, and we need the slurry to cure without freezing in the cavity. Fall is our favorite stretch. Soil moisture has settled out of the summer storms, so what we lift in October tends to stay put.

Winter, we'll come look and we'll tell you the truth. If the drop is a genuine trip hazard at a doorway, there are grinding and temporary ramp options that get you through until spring. If it's a patio you won't use until May, wait. We'd rather book you for a good lift in April than take your money for a marginal one in January.

People fixate on the holes. Honestly, the ports are the easy part. The skill is knowing when to stop pumping, because the last quarter inch of lift is where you either land it perfectly or crack a panel that was fine when you got there.Straight from the crew

Included on every slurry lift

• Grade shot across the whole run so we lift to a plan, not by eye
• Port layout mapped before the drill comes out, kept off visible sight lines where we can
• Cavity filled completely before any lifting pressure goes on
• Panel monitored with a level through the entire lift
• Ports plugged with stiff mortar and struck flush
• Joints between lifted and neighboring panels cleaned and resealed
• Downspout and grading problems pointed out in writing so the fix holds