Foundation problems rarely show up as one dramatic event. They creep in. A door that used to close on its own starts sticking. A hairline crack above a window gets a little longer each summer. A corner of the slab feels lower than it did. On their own, any one of these is easy to write off. Together, they are often the house telling you the ground underneath it has moved.
In Acadiana, the ground moves a lot. Our soil is heavy clay, and clay is the reason so many homes here deal with foundation and slab issues that houses in other parts of the country never see. Understanding what is happening under your slab makes it much easier to catch a problem while it is still small and cheap to address.
Why Acadiana soil is hard on foundations
Clay soil holds water and changes size depending on how much of it there is. In the wet months, the clay under and around your foundation swells as it soaks up water. In a dry stretch, it shrinks and pulls away. That cycle of swelling and shrinking puts constant pressure on a concrete slab, and it does not push evenly. One side of the house might sit over wetter soil than the other because of how water drains across your lot, so the slab gets lifted in some spots and left unsupported in others.
Over years, that uneven movement is what cracks slabs, separates brick, and racks door frames out of square. It is not a sign the house was built badly. It is the normal result of building on expansive clay, and it is why base prep and drainage matter so much here. A slab that was poured over well-compacted base with good drainage will ride out these cycles far better than one that was not.
Add in our high water table and heavy summer rains, and you have soil that stays active most of the year. The homes that hold up best are the ones where water is kept away from the foundation and the soil moisture stays as steady as possible.
The signs worth paying attention to
Start with your doors and windows. They are the most sensitive part of the house and usually the first thing to react when a foundation moves. A door that suddenly sticks, drags on the frame, or swings open on its own points to a frame that is no longer square. Windows that get hard to open or that show a gap at one corner are telling you the same thing.
Look at the walls next, inside and out. Cracks that run diagonally from the corners of doors and windows are the ones to take seriously. A thin vertical crack in drywall is common and often just settling. A diagonal crack that steps down through brick or block, or a crack wide enough to slide a coin into, suggests real movement. On the outside, watch the mortar joints in brick. When they start to separate in a stair-step pattern, the foundation under that section has likely dropped.
Then look at the floors. Walk the house slowly and feel for spots that slope, bounce, or dip. A ball or a round pencil set on the floor that rolls to one side on its own is a quick way to spot a slope you might not notice underfoot. Gaps opening up between the floor and the baseboard, or between the baseboard and the wall, are another clue that part of the slab has moved.
Finally, check where the house meets the outside world. Look for gaps around the frames of exterior doors, separation where a porch or a slab addition meets the main house, and cracks in the concrete of your driveway, patio, or garage floor that line up with problems inside. Concrete outside the house sits on the same moving clay as the slab under it, and it often shows trouble first.
What is normal and what is not
Not every crack means your foundation is failing. Houses settle, especially in the first few years, and small cosmetic cracks come with that. Fine cracks in drywall, hairline cracks in a slab that are not moving, and small nail pops are usually nothing to lose sleep over.
The difference is in size, direction, and change over time. Cracks wider than about a quarter inch, cracks that run diagonally from openings, cracks that keep growing, and problems that show up in more than one place at once are the ones that warrant a closer look. The single most useful thing you can do is track whether a crack is getting worse. Mark the end of a crack with a pencil and a date. If it grows past that mark over the next few months, the movement is active and worth having looked at. If it stays put, you are probably watching old settling that has already stopped.
What causes it to get worse
A few things speed foundation movement along, and most of them come back to water and drainage.
Poor drainage is the biggest one. If your yard slopes toward the house, or if downspouts dump rainwater right next to the foundation, you are soaking the clay in that spot every time it rains. That patch swells more than the rest, and the uneven moisture drives uneven movement. Getting water away from the house is the cheapest, most effective thing most homeowners can do to protect a foundation.
Large trees close to the house work in the other direction. Their roots pull moisture out of the soil during dry spells, shrinking the clay on that side and letting the foundation drop. Plumbing leaks under or near the slab are another hidden cause, keeping one area of soil constantly wet while the rest dries out.
Long droughts followed by heavy rain are hard on every slab in the area, because the soil swings from fully shrunk to fully swollen in a short time. There is not much you can do about the weather, but keeping drainage and soil moisture as steady as you can softens the blow.
When to call someone
If you are seeing one small cosmetic crack and nothing else, keep an eye on it. If you are seeing several of the signs above at once, a sticking door plus stair-step cracks in the brick plus a sloping floor, it is worth having the foundation looked at rather than waiting. Problems that are caught early are almost always cheaper to deal with than ones that have been moving for years, because the longer a slab shifts, the more of the house has to be corrected along with it.
At Royal Builders, we have worked Acadiana homes for more than 25 years, and we know how this clay behaves. We can look at what your house is doing, tell you whether it is old settling or active movement, and be straight with you about whether it needs work now or just watching. If concrete has cracked or sunk past repair, we break it out, fix the base and drainage problem that caused it, and pour it back the way it should have gone in.
If your house is showing some of these signs, call us at (337) 399-1790 for a free estimate. We would rather take a look and tell you it is nothing than have you wait on something that gets worse.