Uneven and sloping floors in Cibolo, TX

What the ground under Cibolo does to a floor

The USDA soil survey records Tinn for Cibolo, with a linear extensibility of 9.8 percent and a very high shrink-swell rating. Tinn is creek bottom clay. Low ground soaks water up quickly and lets it out slowly, so it carries its swell deep into the year. When a dry stretch finally pulls that water back out, the ring of soil around the slab shrinks before the soil trapped underneath it can, and the perimeter settles while the middle stays where it was. A floor is only as flat as the ground holding its edges, which is why that difference reads as slope rather than as a crack. Houston Black is mapped in the area as well and loses volume the same way. We will not tell you which one sits under your particular lot, because map unit lines run through back yards and nobody can call that from a street address. What matters to your floor is the behavior the two share. Both hold a lot of water through the wet months, both hand that volume back in drought, and the slab resting on them follows. The background on that ground is on our Texas clay soil page.

How a slope develops across one season

A slope does not arrive one afternoon. It accumulates. In a wet spring the clay around the slab is near full volume and the floor sits roughly where the builder left it. Through a dry summer the perimeter soil loses moisture first, because it is the part exposed to sun, wind and thirsty roots, while the soil under the middle of the slab stays damp with nowhere to evaporate to. That difference is the entire mechanism. The edge drops, the center does not, and the floor tilts outward by a fraction you cannot see but can eventually feel. The next good rain swells the perimeter back and some of the tilt disappears, which is why homeowners tell us the floor seemed to fix itself. Each cycle tends to leave a little behind, and that leftover is the slope you finally noticed when a chair started rocking.

The drought corner, and why one is always worse

Perimeter drying is not even. One corner nearly always moves further than the rest, and on bottomland clay that gets dramatic, because soil that was wettest has the most volume to lose. The corner that bakes through the afternoon, the one with a big tree pulling water out of the root zone, or the one that soaked up roof runoff all storm season and then went dry, is the corner that swings the furthest. Geometry makes it worse. A corner is supported on two sides instead of four, so the same soil shrinkage tilts more floor there than it would mid-wall. On the finished elevation map the low point sits at a corner far more often than anywhere else. Sometimes the right first move is not a repair at all but steady perimeter moisture through the dry months, which is what foundation watering on Texas clay is for.

Why the elevation survey settles it

Feel is a poor instrument. Rooms are long, floating floors flex, and a sloping ceiling line can convince a person the floor is tilting when it is not. The free inspection replaces all of that with a 40-point floor elevation map read in tenths of an inch by an ICC-certified inspector. The map shows where the low area is, which direction the floor falls, and whether the low spot lands under the corner you already suspected. Just as useful is what it rules out. Close to a third of our inspections come back with nothing to repair, and that verdict gets dated and written down exactly like any other, so a second reading next year actually means something. The general version of this, including pier-and-beam homes and the thresholds we measure against, lives on our national page for foundation repair for uneven floors.

What the repair looks like when the map justifies it

When the readings show genuine settlement, the fix is support under the low sections. We set steel and hybrid piers only, about $600 to $1,000 per pier installed, and how many you need is read off the elevation map rather than picked out of the air. The warranty on the piers is lifetime and transferable to the next owner, and we re-read the floor at a performance follow-up inspection every year to confirm the correction held. The full pricing math sits on the cost guide.