The Texas Summer Foundation Talk Every DFW Homeowner Should Have With Themselves
Every year in late June we have a version of the same conversation, usually three or four times in a single week. A homeowner calls and says some combination of: the front door is sticking, there's a new crack in the drywall above the bedroom doorway, the garage floor has a line that wasn't there last summer.
And every year we have to say the same thing back. "Yeah. Welcome to Texas in July. Let's talk about what's actually happening under your house, because the news isn't terrible — but the next ninety days matter."
If you live in DFW and your home sits on a concrete slab — which is the vast majority of homes built here in the last forty years — your foundation is moving right now. Not catastrophically. Probably not even visibly yet. But the soil under your slab is shrinking, and the question isn't whether your foundation is shifting this summer, it's how much and what you're doing about it.
This is the foundation conversation we wish every Fort Worth homeowner would have with themselves once a year. The good news is, the most important thing you can do about it costs almost nothing and takes about twenty minutes a day.
What Is Actually Happening Under Your House
The soil across most of DFW — Trinity Clay, Eagle Ford Clay, Houston Black Clay, the "black gumbo" stuff that turns rock-hard in August and sticky in March — is what geologists politely call "expansive." Less politely: it's the worst soil in the country to build a house on, and we built a metro of eight million people on top of it anyway.
When this clay is wet, it expands. When it dries out, it shrinks. The technical numbers are wild — Trinity Clay has a plasticity index of 51.9, which is about as high as residential soil shrink-swell gets. Eagle Ford can move vertically as much as seven inches across a single dry-to-wet cycle. Seven inches. Under a slab that was poured to be perfectly flat.
In a wet spring like the one we just had, the soil is plump with moisture and your slab is sitting evenly on it. Then July arrives, the rain stops, the temperature pegs to 100 for two weeks, and the clay under your house begins to dry. It shrinks. It pulls away from the perimeter of your slab. Gaps form. Voids open up.
If the soil dried out perfectly evenly across your entire lot, your house would just settle down a quarter inch and you'd never know. But it doesn't. The shade under the big oak tree dries differently from the sunny side of the yard. The flowerbed by the front porch dries differently from the strip of grass next to the driveway. The area where your downspout dumps water dries differently from the corner that gets no runoff at all.
That uneven drying is what cracks foundations. The slab doesn't sink — it twists. One corner drops a half inch while another corner holds steady, and somewhere in the middle of the house, a doorframe stops being a rectangle.
The Warning Signs You Should Be Walking Around Looking For Right Now
Take twenty minutes this weekend and walk your house. Inside and out. Here's the checklist.
Doors. Every interior door. Open and close each one. Does any of them stick? Catch at the top? Refuse to latch where they latched in March? A door that no longer fits its frame is one of the earliest and most reliable signs of slab movement.
Drywall corners around door and window openings. Look up at the top corners of every doorway and window inside the house. Are there cracks angling diagonally up and out from the corner? Stair-step cracks running along the seams? Most homes have a few hairline cosmetic cracks from normal settling. The ones to flag are wider than the edge of a credit card, growing visibly over weeks, or running through trim and not just paint.
The brick or stone exterior. Walk around the outside. Look for stair-step cracks in the mortar — the diagonal zigzags that follow the brick joints. Look at the gap between the trim around your windows and doors and the masonry. Gaps that weren't there before are a real sign.
Floors. Take a level into a few rooms. Or just put a marble on the kitchen floor. If it rolls noticeably and consistently in one direction, that's not "an old house." That's slab movement.
Around the perimeter of your slab. Walk the outside of your house and look at the dirt right against the foundation. Is there a visible gap between the soil and the concrete? That gap is the soil pulling away. The soil should be in contact with the concrete. When it isn't, you have an open invitation for water — when it does eventually rain — to run straight down against the foundation and do its own damage.
A few of these signs together, especially if they're getting worse over a few weeks, is the moment to call a foundation engineer for an honest assessment. Not a "free inspection" from a foundation repair company — those are sales calls. A licensed structural or geotechnical engineer charges a few hundred dollars for an independent opinion and is worth every penny.
The Twenty Minutes a Day That Saves You Twelve Thousand Dollars
Here's the part most homeowners haven't been told plainly enough.
The single best thing you can do for your DFW slab foundation in July, August, and September is water it. On purpose. Methodically. Every day.
The technique is simple. Lay a soaker hose around the perimeter of your house, about 12 to 18 inches out from the foundation — not against it. Bury it just under the surface or cover it with mulch. Run it for somewhere between 15 and 30 minutes in the early morning, five days a week through the worst of the heat. The goal isn't to flood the yard. The goal is to keep the soil along the perimeter consistently damp — not muddy, not bone dry — at a depth of six to eight inches.
Quick check on whether you're watering enough: take a long screwdriver and push it into the dirt six inches off the foundation. If it slides in to the handle without resistance, you're good. If it stops dead after an inch and a half, the soil is too dry and you need more water, more often.
A few practical notes for Fort Worth and Dallas residents. Both cities have moved to permanent twice-a-week outdoor watering restrictions: odd-numbered addresses water Wednesday and Saturday, even-numbered addresses water Thursday and Sunday, and irrigation is prohibited from 10 a.m. to 6 p.m. between April and October. Foundation watering falls under irrigation. So your soaker hose schedule has to fit those days and those hours — early morning is the smart choice anyway, because evaporation in afternoon Texas summer is brutal.
Within those two allowed days, you can water deeply on each day rather than sprinkle a little every day. The point is to deliver enough moisture to maintain stable soil conditions across the full week. Most homeowners do something like a 40-to-60-minute run on each allowed day along the foundation, plus their normal lawn watering elsewhere.
The cost of all this is some hose, an inexpensive timer, and a few extra dollars on the water bill — call it $30 to $60 a month at the peak. The cost of not doing it, if your foundation moves enough to need repair, is a slab pier job that runs $8,000 to $25,000 depending on the size of the house and the depth of the piers. Pier-and-beam repair costs are similar — $6,000 to $15,000 for a typical home. And that's before any plumbing damage the movement may have caused under the slab, which can equal or exceed the foundation repair bill on its own.
The math is not even close. Water the foundation.
What Insurance Will and Will Not Cover
This one stings. Most Texas homeowners assume their insurance has their back if the foundation goes. It mostly doesn't.
Standard homeowners policies in Texas exclude foundation damage caused by soil movement — including drought-related shrinkage, expansive clay shifting, and tree roots pulling moisture. The reasoning insurance companies use is that this isn't a sudden accidental event, it's a foreseeable consequence of the soil and climate we live in. So they don't cover it.
There's one narrow exception. If a plumbing leak under your slab causes foundation damage — a burst supply line, a leaking drain — the water damage portion of the loss is sometimes covered, and in some policies the related foundation repair may be too. But it's case-by-case, and the coverage is usually capped low.
Some carriers offer foundation endorsements as a separate add-on. They cost extra and they come with significant exclusions. Worth asking your agent about, but don't assume you have one unless you've explicitly added it and read the fine print.
The practical takeaway: foundation repair is almost always an out-of-pocket expense in Texas. Which is exactly why prevention is so important. There is no safety net.
Trees, Slopes, and the Other Variables Most People Forget
A mature oak tree pulls something like 150 to 190 gallons of water out of the soil on a hot Texas day. If a big tree is within twenty feet of your foundation, its roots are very likely under your slab right now, and during a drought stretch those roots are sucking the moisture out of the soil under your house faster than soaker-hose watering can keep up.
You don't have to take the tree down. But you may need to water the foundation more aggressively on the tree side, or install a root barrier between the tree and the house. A root barrier is a buried vertical sheet that redirects root growth — it's a several-thousand-dollar project, but it's much cheaper than a foundation repair, and on certain lots it pays for itself many times over.
Grading matters too. Your yard should slope away from the foundation in every direction — about a half-inch of drop per foot for the first six feet. If you have flat or, worse, negatively-sloped sections of yard where rainwater pools against the house, that pooling causes its own kind of foundation damage in the wet season that mirrors the drought damage in the dry one. Most yards need a regrading pass every five to ten years to keep the drainage right.
And finally: gutters and downspouts. If your downspouts dump rainwater right at the corner of your foundation, you are creating a perfect alternating wet-and-dry zone that's almost custom-designed to crack a slab. Extend every downspout at least four to six feet out into the yard. It's a $15 part at the hardware store and one of the best foundation moves you'll ever make.
When Repair Actually Makes Sense
If your house has clearly moved — multiple sticking doors, growing drywall cracks, visible stair-step brick cracks, a floor that's noticeably off — get a structural engineer's report. Don't get five "free estimates" from repair companies. Get one independent assessment from someone whose business is not selling you piers.
If the engineer says repair is warranted, the best time to do the work in DFW is actually late summer or early fall — soil is at its most stable predictable state when it's been consistently dry for a while, before the autumn rains return. Spring repair is harder because the soil is changing fast under your slab while crews are trying to set permanent piers into it.
But for the vast majority of DFW homeowners reading this — most of you don't need repair yet. You need a soaker hose and a calendar reminder. Three months of consistent watering through July, August, and September is what keeps your foundation off the surgery list for another year.
What We Tell Our Own Clients
Every house we build, every house we renovate, we tell the owner the same thing on closing day: you bought a house in Texas. You're going to water this slab in the summer like other people water their lawn. It's not optional. It's part of owning a home here.
Some people roll their eyes. The ones who listen save themselves a four-figure repair bill three years later and the ones who don't, don't.
If you're walking around your house this weekend and you see something that worries you — a new crack, a sticking door, a gap that wasn't there last fall — we're always happy to take a free walk-through with you and tell you whether what we see is normal Texas movement or something worth taking seriously. We won't try to sell you anything. We'll just tell you what we see. That's what we do.
The clay isn't going anywhere. Neither is the summer heat. The best foundation in Texas is the one whose owner is paying attention.
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