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Burnet · Burnet County

Foundation Underpinning Burnet, TX.

Burnet sits on the Llano Uplift, where granite and fractured limestone rise within a few feet of grade, terrain that bears a foundation unevenly and demands underpinning driven to verified refusal, not a guessed depth.

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Most settlement problems in Burnet come down to a single fact about the ground here: the rock isn't flat. The Llano Uplift pushes ancient granite batholiths and ledges of fractured limestone to within two or three feet of the surface, and that bedrock surface tilts, dips, and changes hardness over the span of a single floor plan. One corner of a slab may rest squarely on competent granite while the footing eight feet away bridges a soft lens of decomposed, sandy material with a fraction of the load capacity.

The result isn't the slow, uniform sinking you read about in clay-country brochures. It's differential settlement, one part of the structure holding while another drops away, and it's exactly the failure mode that hydraulically driven galvanized steel piers are built to correct. Underpinning here is less about reaching some standard depth and more about confirming, pier by pier, that each one has actually found ground that will carry the house.

Why Burnet's bedrock makes underpinning a precision job

East of the Balcones Escarpment, foundations fight deep, uniform Blackland Prairie clay with plasticity index values often in the 40 to 60-plus range. Burnet's soils are different. The clay overburden tends to run lower in plasticity, moderate rather than extreme, but it sits in a thin, uneven blanket over hard rock. That thin layer drains fast and unpredictably, so a slab can be rock-solid on one side and floating over a damp seam on the other after the same rainstorm.

The uneven rock surface introduces a risk that doesn't exist in flat clay country: a pier or drilled shaft that lands on a sloped granite face can creep sideways under sustained vertical load instead of holding. That's why we don't drive to a predetermined depth or judge bearing from the cuttings a driller pulls up. Each galvanized steel pier advances until it reaches a measured, engineer-verified resistance, refusal against ground that genuinely carries weight.

Cut-and-fill lots, common on Burnet's slopes, add one more variable. Engineered fill consolidates at a different rate than the native rock beside it, so two footings only a few feet apart can settle on entirely different schedules. Mapping where that's happening, before anyone prices a single pier, is the whole point of starting with a survey rather than a sales pitch.

How a Burnet underpinning project actually runs

01

Free elevation survey to ±0.01 in.

We map the floor plane across the entire footprint to 1/64-inch accuracy, separating real structural settlement from cosmetic movement like nail pops and tape seams.

02

Engineered pier plan

Using the survey contour, the engineer sets exact pier count, spacing, and placement against load-bearing walls, plus a lift sequence designed to protect existing finishes.

03

Drive to verified refusal, then lift

We excavate to each footing, drive successive galvanized steel pier sections through a hydraulic ram until they hit engineer-specified refusal, then raise the structure incrementally while monitoring multiple points.

04

Re-survey, document, warranty

The final floor profile is re-measured and recorded, and the steel-pier stabilization is locked in under a lifetime transferable warranty before the crew leaves.

"As close to level as practical" is on purpose

A house that's been out of plane for years has framing, trim, and finishes that adjusted to the distorted shape. Forcing it back to a perfect plane can crack things that were stable.

We coordinate lift targets with you off the survey data, raising millimeters at a time to recover elevation without introducing new damage, not chasing a number for its own sake.

Burnet foundation underpinning questions, answered

My house sits right on rock, why would it move at all?
Because the rock surface under Burnet homes is uneven and the soil over it is thin and patchy. Water collects above the stone in some spots and not others, so the slab can be firmly supported on one side and bridging a soft seam on the other. That difference is what cracks foundations here, even on lots that feel like solid ground.
What does underpinning run for a home in Burnet?
Most steel-pier projects here land between $4,500 and $14,000, driven by pier count, access, and any drainage work. The free elevation survey sets a measured, fixed scope first, so the number isn't a guess. Financing is available if you'd rather spread it out.
Why steel piers instead of the concrete pressed piers I've been quoted?
Concrete pressed piers rely on friction along a stacked cylinder, and on Burnet's irregular granite and limestone they can deflect sideways or refuse early against a shallow ledge without ever reaching consistent bearing. Driven steel piers advance to verified hydraulic refusal, confirming true load capacity at each spot.
The cracks are worst at one corner of the house. Is that normal here?
Yes, and it's a useful clue. On uneven bedrock, differential settlement concentrates stress at the re-entrant corners of the foundation, so you'll often see stair-step or diagonal cracking that widens at one end. That tells us which side has dropped before we even pull out the survey gear.
Could the live oaks near my foundation be part of the problem?
They can be. Live oaks, cedar elms, and the native junipers across the Hill Country pull soil moisture aggressively in dry summers, and because the overburden above rock is so thin, even modest drying can open voids and let a corner drop. Keeping drip-line setbacks and deep-watering during drought helps.
Will fixing the foundation help when I sell to an Austin buyer?
A documented repair generally helps. A lot of Burnet County transactions involve buyers coming from Austin who expect full disclosure of any foundation work, and a written engineer-backed repair with a lifetime transferable warranty reads as an asset rather than a red flag at the negotiating table.
Once the piers are in, am I done, or should I worry about drainage too?
The piered sections are carried on steel below the moving soil, so they shouldn't ride the seasons again. But areas that weren't piered still can, which is why we often pair the work with drainage correction and grading. Aim for six inches of fall over the first ten feet away from the slab to keep water from ponding against it.
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Every GroundLock service, available throughout Burnet and the surrounding area:

Steel Pier Foundation RepairSlab Foundation RepairHouse LevelingFoundation LevelingFoundation StabilizationFoundation Settlement RepairFoundation InspectionFoundation Repair CostSinking Foundation RepairResidential Foundation RepairCommercial Foundation Repair
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