Sinking Foundation Repair Bulverde, TX.

A foundation that drops in Bulverde tends to do it quietly at first, a hairline at a door corner, a marble that won't sit still on the kitchen tile, and then all at once after a wet spring. The reason sits a foot or two under your slab. North of San Antonio the Edwards Plateau limestone rides close to the surface, and the thin mantle of residual clay and rock-fill over it behaves nothing like the deep Blackland soils east of the Balcones Escarpment.

That changes what "sinking" even means out here. The usual culprit isn't shrink-swell heave but uneven bearing: one footing rests on solid stone while another spans a fracture pocket filled with clay or loose rubble. Pin down where that support disappears and the fix becomes straightforward, anchor the structure to rock that isn't going anywhere.

What's actually moving under a Bulverde slab

The limestone beneath most Bulverde lots is heavily jointed and weathered along its bedding planes, which means bearing capacity can swing dramatically over the span of a few feet. A footing over a solid outcrop carries load very differently than one bridging a seam of clay infill or fractured rubble. The slab feels the difference long before you do, and it shows up as one low corner rather than a whole edge settling evenly.

Newer subdivisions add a second layer to the problem. A lot of these lots were cut-and-fill graded, with imported rock-fill or decomposed caliche placed beneath the slab edges. That material consolidates slowly under the weight of a house and erodes easily when irrigation or roof runoff finds the seam between fill and native ground. The result is slow, progressive settlement that lurches after heavy rain and stalls in dry spells, easy to shrug off until the interior finishes tell the whole story.

Because the cause is differential support over irregular rock, a visual crack survey alone won't size the job. The shape of the movement, whether a single zone has dropped or a whole side has rotated, is what dictates where piers go and how deep they need to reach.

How we read your slab before touching it

Every Bulverde project opens with a free elevation survey accurate to ±0.01 in. (1/64 in.), taken across the full perimeter and the interior load-bearing points. That produces a topographic map of the slab exactly as it sits today, showing the magnitude and the shape of the movement, center drop, edge drop, or a localized zone.

We pair that map with the lot's grading history. If your home sits on imported fill of unknown compaction, that's not a footnote; it directly changes pier spacing and depth. You leave the visit with a written, engineer-backed plan and a measured scope, not a ballpark. Most Bulverde steel-pier projects land between $4,500 and $14,000 depending on pier count, access, and drainage, and the survey costs nothing whether or not you hire us.

Lasting results usually mean fixing the water, too. Where it protects the foundation, we'll fold in drainage correction and erosion control so the fill zones stop getting soaked after the piers are in.

Signs worth a survey on a Bulverde home

Over fractured rock and fill, these patterns tend to show up before any dramatic exterior cracking, catch them early and the repair stays smaller:

• Slab cracks that widen after heavy rain, then partially close once the ground dries, a tell of fill consolidation or clay infill cycling in the rock fractures.
• A single low corner or a floor that pitches noticeably to one side while the rest of the house stays put.
• Interior doors that bind at the latch or top of the frame, plus diagonal cracks running off door and window corners.
• Stair-step cracks in exterior brick or block, often concentrated near the settling end of the house.
• Gaps opening where walls meet trim or ceiling, and cracks at the garage slab where edge fill is shallowest.
• Irrigation or downspouts discharging tight against the foundation, concentrating moisture exactly where the fill is most vulnerable.

Bulverde sinking foundation questions