A Documented Slab Repair in the Northeast Bexar Clay Corridor

This walkthrough describes how a slab foundation project moves from a homeowner’s first phone call to a documented completion. The property, the readings, and the scope below are illustrative and composited from the kind of work we do in the northeast Bexar corridor. They are not the record of one specific customer’s home, and we have labelled it that way deliberately rather than presenting a constructed example as documented proof.

What is accurate is the process: what gets measured, what gets decided, and what the homeowner ends up holding at the end. It is the same sequence we follow on every foundation repair project in San Antonio, whatever the foundation type turns out to be.

The Call

A single-story brick ranch, roughly 1,850 square feet, built in the early 1990s in the corridor between Converse and Schertz. The owner had noticed a stair-step crack running up from the corner of a front window, maybe three feet of it, and the front door had become progressively harder to latch over about eighteen months. A second, finer crack had appeared inside above the hallway door frame.

Two things in that description mattered before anyone visited. The first was “progressively” rather than “seasonally.” Sticking that comes and goes with humidity behaves differently from sticking that gets steadily worse. The second was the pairing: exterior masonry cracking and interior door operation changing together points in a more consistent direction than either on its own.

We booked an evaluation. We also said on the phone what we say to everyone: the visit might well conclude that nothing needs doing yet.

What the Evaluation Found

The elevation survey ran room by room across the whole plan. Plotted out, it showed a clear pattern rather than a scatter of numbers: the front-left corner of the house sat measurably lower than the rest, with the deflection increasing steadily toward that corner. The rear half of the house was comparatively flat.

That shape is informative. A uniformly low house has usually settled uniformly, which rarely damages anything. A house with one corner dropping is experiencing differential settlement, and the structure has to absorb that difference somewhere. In this case it was absorbing it at the front window corner and at the hallway door frame, which is exactly where the cracking had appeared.

The exterior walk added context. The affected corner had a downspout discharging directly at the slab edge with no extension, a flower bed built up about four inches above the brick ledge, and a mature live oak roughly twelve feet from that corner. The opposite side of the house had none of those things.

Nothing in that combination proves causation on its own. Together, they describe a corner that is wetter than the rest of the house through a rainy period and drier than the rest during a drought, which is the classic driver of shrink-swell movement in expansive clay.

The crawlspace question did not arise; this was slab-on-grade. We checked the slab type and found a conventionally reinforced slab rather than post-tensioned, which meant interior pier placement was an available option without tendon-location work.

The Recommendation and the Conversation

The findings summary said, in plain terms: measured differential settlement concentrated at the front-left corner, consistent with moisture-driven movement, with contributing site factors present. Repair recommended. Drainage correction recommended alongside, not as an upsell but because the downspout and the raised bed were feeding the condition.

The proposed scope was perimeter piers along the affected elevation and around the corner, with a specific count and specific placements marked on a plan. Steel push piers, chosen because the depth to a competent bearing stratum in that corridor is variable and push piers can follow it rather than being limited to a preset depth.

We also stated what the scope did not include, which is the part most homeowners tell us is missing from other proposals they have seen:

• Cosmetic repair of existing cracking was excluded. The cracks were the symptom; closing them is separate finishing work.
• Landscaping beyond backfill and rough grading was excluded, with the bed rebuild identified as the homeowner’s to arrange or a separate line item.
• The irrigation line running through the work zone was flagged with a note about who would cap and reinstate it.
• Pier depth carried a stated assumption with a written variance clause, because refusal is an outcome of the ground rather than a number we control.

The homeowner asked the question everyone asks: would the cracks close up? The honest answer is that some closure is common during a lift and it is not the objective. The objective is stabilising the corner so the differential stops increasing. Any crack closure is a by-product.

The Work

Excavation exposed the grade beam at each marked pier location. Brackets were attached, and pier sections were driven hydraulically until the gauge recorded refusal pressure. Depth varied across the run, which is normal in this corridor and is precisely why the variance clause exists.

Hydraulic lifting followed, with jacks along the pier line operated together so load transferred gradually. The lift was staged over the working day rather than pushed to the maximum achievable in one pass. Readings were taken between stages.

Inside, the household heard the work and noticed the movement. A hairline relief crack appeared above a bedroom door that had previously been clean. This was expected, it was discussed beforehand, and it is what the written scope means when it excludes cosmetic repair.

Backfill went in, the perimeter was regraded to fall away from the slab, and the downspout was extended to discharge well clear of the corner.

On drainage and sequencing

The drainage correction went in as part of the same project rather than as a follow-up. Where excavation is already open along the elevation that has the water problem, digging the same ground twice makes no sense. That is a practical scheduling point, not a universal rule.

What the Homeowner Ended Up With

Document	What it establishes
Findings summary	What was observed and measured before work began
Elevation floor plan (pre-repair)	The baseline profile, with the corner deflection recorded
Written scope	Pier count, placements, method, inclusions, exclusions, schedule
Warranty terms	What is covered, what is excluded, and transfer conditions
Post-repair elevation documentation	The profile after the lift, measured rather than described

That final document matters more than people expect at the time. Years later, when a buyer’s inspector notes evidence of prior foundation work, the difference between “yes, it was repaired” and a folder containing a pre-repair profile, a scope, a warranty, and a post-repair profile is substantial.

What This Example Does Not Establish

It does not tell you what your house needs. The corner-drop pattern described here is common in this corridor, but it is one of several patterns, and a rising centre or a lifted perimeter would have led to a completely different conversation, possibly starting with a hydrostatic plumbing test rather than a pier proposal.

It also does not establish a price. Pier count, depth, access, and associated work vary enough between properties that a figure from one project tells you very little about another. Our cost guide walks through the factors that actually move the number.

If what you are noticing sounds familiar, the useful next step is measurement, not comparison to someone else’s house.

Concerned about a corner of your home dropping? — Read about slab foundation repair