Sinking Foundation Repair Marble Falls, TX.
Where the Edwards Plateau meets the Llano Uplift, a settling foundation is rarely about clay alone. GroundLock reads the pattern of the drop first, then drives galvanized steel to solid rock.
How we diagnose and stop a sinking foundation here
Map the drop to 1/64 inch
A free elevation survey accurate to ±0.01 in. across the whole footprint shows exactly which corners have settled, by how much, and in what shape.
Read the pattern
The survey map tells us whether we're looking at uncompacted rock fill, a drainage channel washing out fines, or seasonal clay movement, each needs a different fix.
Drive galvanized steel to refusal
Piers are pushed hydraulically until they hit competent strata, limestone, dense granite, or deep caliche, well below the active zone, then locked off.
Lift, then manage the water
We raise the settled section on a planned lift sequence and correct the grade or moisture that caused it, so the movement doesn't simply start over.
Why Marble Falls ground sinks the way it does
This stretch of Burnet County sits on a geological seam, granite bedrock, fractured limestone, and clay-filled solution pockets all within a few feet of each other. The soil profile is often shallow and discontinuous: thin loam over decomposed granite grus, interrupted by limestone ledges, and in many neighborhoods underlain by imported rock fill left over from older road and site grading. That layered unpredictability is the whole reason a sinking foundation here deserves a site-specific look instead of a stock repair.
The most common failure doesn't start with expansive clay at all. It starts with irregular bearing. When a slab or pier-and-beam home is set over fill, decomposed granite, limestone rubble, engineered rock base, those loose particles keep compacting under the weight of the house for months or years. Rain makes it worse fast: water infiltrates the fill, carries the fine material downward, and leaves the coarse aggregate in a progressively looser arrangement. One part of the foundation drops relative to another, and that's differential settlement.
There's a second pathway that's sharper and scarier. Rock fill placed during grading but never properly compacted can void out below the slab, leaving an unsupported span. The concrete bridges that gap until it cracks through, and then the foundation can drop suddenly rather than creeping. Telling that apart from slow clay movement is exactly what the elevation map is for, and it's why foundation repair around here begins with measurement, not a sales pitch.
Rock fill under a slab does not heal itself
Once fines migrate out and a void opens beneath the concrete, it only gets larger with each wet season. Piers driven to load-bearing strata transfer the home's weight past that failing fill entirely.
Concrete pressed piers that stop inside the six-to-ten-foot active zone stay vulnerable to the same movement. Galvanized steel driven to refusal doesn't.
Signs your Marble Falls foundation is settling
A few of these together is worth a free survey, catching differential settlement early keeps the pier count, and the cost, down.
- Diagonal cracks running about 45 degrees from the corners of window and door openings, the clearest early tell.
- Cracks that are wider at the top than the bottom, which points to the far edge of the slab dropping away.
- Doors and windows that suddenly stick or rack in their frames after a wet or drought season.
- Grade that's flat or slopes back toward the house instead of falling six inches over the first ten feet away from it.
- Sprinkler heads or beds sitting right against the slab, saturating granular fill and washing fines downward.
- A hollow or drummy sound underfoot in one area of a slab, a possible sign of a void from rock fill below.
Marble Falls foundation questions, answered
How much does sinking foundation repair cost in Marble Falls?
My cracks are diagonal at the window corners, is that the ground moving?
Why steel piers instead of concrete ones for a home over rock fill?
Do you handle pier-and-beam, or only slabs?
Will you fix what's causing it, or just jack the house up?
How does pier depth vary across my property?
How soon can you start once I approve the plan?
Book your free
foundation inspection.
Tell us where you are and what you’re seeing. A GroundLock structural advisor confirms within one business hour.
All foundation services in Marble Falls
Every GroundLock service, available throughout Marble Falls and the surrounding area:
Get your free foundation inspection.
A licensed inspector measures your slab elevation to ±0.01 in. (1/64 in.) and gives you a written, engineer-backed plan with zero pressure.