Every August, the calls start sounding the same. A door that latched fine in April won’t close. A crack over the garage that was a hairline in spring is wide enough to hold a pencil. The lawn has pulled back from the slab like a low tide, leaving a gap you can slide your hand into. None of this is a coincidence, and none of it means your house is failing. It means your house is standing on Central Texas clay in a drought, and the clay is doing what clay does.
What drought actually does to expansive clay
The Blackland Prairie soil under most Waco-area homes behaves like a sponge. When it rains, it absorbs water and swells. When it bakes through a dry summer, it gives that water back to the sky and shrinks, and the shrinking is not polite. Soil that supported your foundation in May can drop away from it by August, leaving sections of the slab bridging ground that is no longer holding its share of the weight.
The damage comes from the unevenness. The soil at your sun-baked southwest corner dries fast; the shaded soil by the north wall holds its moisture longer. Add a big live oak drinking hundreds of gallons on one side of the house, and the ground under one part of your foundation is shrinking while another part barely moves. A slab is one continuous piece of concrete; when the ground under it moves unevenly, the slab bends, and the house above it shows the strain.
The symptoms that show up in a dry summer
Drought symptoms tend to arrive in a recognizable order, and the early ones are easy to dismiss:
- Gaps between soil and slab. The clearest early signal, visible along the foundation edge by mid-summer.
- Doors and windows sticking, usually on the side of the house that gets the most sun.
- Hairline drywall cracks reopening at door frames and window corners, right where you patched them last year.
- Stair-step cracks in brick or limestone, climbing the mortar joints near a corner.
- A floor that develops a lean toward the driest side of the lot.
One symptom on its own is a note to watch. Two or more, arriving together in a dry stretch, mean the soil is moving your foundation, and the pattern will repeat every summer until something changes. Our education page walks through each symptom in more detail.
What you can do right now, for free
The goal in a drought is not to keep the clay wet. It is to keep the moisture even, so no one section of soil shrinks dramatically faster than its neighbors. Three habits help:
- Water the foundation line evenly. A soaker hose a foot or so out from the slab, run in the early morning a few times a week, evens out the perimeter. Water every side, not just the one with the flowerbed.
- Mind the trees. Large trees near the house pull enormous amounts of moisture in a drought. Deep-water them separately so they drink from their own zone instead of from under your slab.
- Don’t undo it in the fall. When the rain returns, gutters and grading matter most. Water dumping at a drought-shrunken slab edge swells that soil fastest of all, and the whiplash is worse than the drought. Our drainage page covers the fixes.
Watering helps at the margins, and we recommend it. But watering is maintenance, not medicine. If the house is already showing symptoms, the soil has already moved.
Ronnie Wiethorn, The Foundation Doctor
When it’s past the soaker-hose stage
If the symptoms are stacking up, the honest next step is measurement, not guesswork. Elevation readings across the foundation show exactly which sections have dropped and how far, and that map decides everything. Early seasonal movement often calls for StableSoil treatment, which calms the clay’s shrink-swell cycle at a fraction of structural repair cost. Ground that has genuinely failed under part of the house calls for pressed piers that carry the foundation past the active clay layer entirely.
Either way, a drought is actually a revealing time to get the house looked at: the soil is at one extreme of its cycle, the symptoms are at their most visible, and the readings tell a clear story. The inspection is free, the price comes in writing, and if the honest answer is “run the soaker hose and call us if it grows,” that is exactly what you’ll hear.