Salt Valley Clay, Development Fill, and Water That Has to Go Somewhere
Southern Lancaster County ground is heavier than what you find north of Lincoln. Around Hickman you are in the upper Salt Creek watershed, in the country the Salt Valley flood-control reservoirs were built to manage — Wagon Train and Stagecoach are both a few minutes from town. The soils in those drainages carry more clay than the loess uplands, and clay does something concrete does not like: it swells when it gets wet and shrinks when it dries, with enough force to lift a slab in a wet spring and drop it again in a dry August.
The fix is not exotic, it is just work. We over-excavate below the slab, bring in and compact clean granular base, and moisture-condition the subgrade rather than pouring on ground that is bone dry in July. Dry clay under a new slab is a slab waiting for its first wet winter. Where a patio or a driveway sits over a lot of clay we go thicker and tighten the joint spacing, because joints are how you decide where a crack goes rather than whether one happens.
New construction adds the second problem. A Hickman subdivision lot has usually been cut, filled and rough-graded, and the strip of ground right beside the foundation is backfill that will keep settling for years. That is exactly where a patio or a stoop wants to go. Pouring across a backfill zone without dealing with it is how you get a patio that tips back toward the house inside five years, which then routes water at the foundation wall — a two-thousand-dollar mistake that turns into a much larger one. We deal with it honestly at the estimate, which sometimes means a thicker section and sometimes means a structural approach on the first few feet out from the wall.
Then the weather. Air entrainment goes in every mix, because from late November through March a slab here freezes overnight and thaws in the sun most days, and water that gets into concrete with nowhere to expand tears the surface off it. We also tell every customer the same thing about the first winter: no ice melt on new concrete, none, use sand for traction. Rural Lancaster County roads are treated, tires track it home, and new concrete has not yet developed the surface density to shrug it off.
What we pour in Hickman
- Driveways, replacements, and widening strips
- Patios, walkways, and outdoor living slabs
- Front steps, stoops, and porch slabs on proper footings
- Garage, shop, and outbuilding floors
- RV, boat, shed, and equipment pads
- Repair, resurfacing, slab lifting, and removal
