You walk down the hall and stop. There's a crack climbing out of the top corner of a doorway, thin as a hair, and you know it wasn't there in the spring. Your mind goes straight to the worst version: the foundation's failing. Then to the second worst, which is what that's going to cost.
Take a breath. This is one of the most common calls we get every summer in Allen, and most of the time it's a lot smaller than the number you're picturing. Here's how to read what you're looking at.
Why These Cracks Show Up Every Summer in Allen
Nearly every home in Allen sits on a slab poured over expansive clay. That clay is the whole story. It swells when it takes on water in the spring and shrinks when it dries out, and a hot Collin County summer dries it out fast. By July we've usually gone weeks with no real rain. The soil pulls back, the slab settles a hair, and the house moves with it.
Not much. But drywall has no give, so it's the first place the movement shows. It cracks where the stress piles up. The top corners of doors and windows, and the seam where the wall meets the ceiling. Those corners are the weak points every time. It's the same seasonal push and pull that shows up in almost every remodeling project around here. You're just seeing it in the walls instead of the schedule.
Here's the tell that it's seasonal: a lot of these hairlines come and go. The ground drinks in the fall, the clay swells back, and the crack that had you worried in August is hard to find by November. And it's not an old-house problem. Newer subdivisions like Twin Creeks and Montgomery Ridge move just as much as the older parts of town. It's the dirt, not the age of the house.
The Cracks You Can Usually Relax About
Most of what shows up this time of year is skin deep. You can generally let a crack be when it looks like this. It's a hairline, too thin to slip a coin into. It runs straight up from the corner of a door or window, or straight along the wall-to-ceiling seam. It follows a taped drywall joint. And it's holding still, not getting longer or wider from one week to the next.
That kind of crack is just the drywall telling you the house breathed. Nail pops are the same story. Those little round bumps where a screw has slowly backed its way out of a stud. Annoying, cosmetic, and not a foundation emergency.
The Cracks Worth Taking Seriously
Now the honest half, because a good neighbor tells you the truth in both directions. Some cracks earn a second look, and it's usually not one sign on its own. It's a few of them showing up together.
Look closer when a crack is wider than a quarter, or wide enough to slide a coin in. When it runs on a diagonal across the middle of a wall instead of straight up from a corner. When you see stair-step cracks climbing the brick outside along the mortar lines. When doors and windows that always closed fine start sticking or won't latch. When the floors feel like they slope, or a gap opens up between the baseboard and the floor. And most of all, when the crack keeps growing, or comes back a little wider every summer.
Any one of those on its own is often still nothing. Two or three together is the house telling you the movement is more than seasonal. That's when you want a foundation engineer to look before you touch anything cosmetic. It's the same reason we tell folks not to skip a good once-over after a rough storm season. A post-storm walk-through catches this while it's still cheap to deal with.
What To Do Before You Call Anyone
Whether it turns out to be nothing or something, spend five minutes gathering evidence first. It costs you nothing and it makes the whole conversation faster later.
Take a photo, and set a coin or a tape measure right next to the crack so you can see the real width down the road. Then take a pencil and mark the end of the crack with today's date next to it. That's your baseline. If it grows past the mark over the next few weeks, now you know for sure it's moving and not just bugging you. Check it again after the first real soaking rain. A lot of seasonal cracks visibly ease up once the ground drinks.
And the one nobody expects: in a dry stretch, water your foundation. Run a soaker hose a foot or two out from the slab a few evenings a week so the clay stays evenly damp instead of shrinking hard on one side. Keeping that soil steady is one of the cheapest ways to slow the movement in the first place. It's exactly the kind of small job that's easy to put off until something cracks.
How We Fix a Seasonal Crack, and When We Tell You to Wait
If it's cosmetic, the repair is simple and it holds. We don't just smear mud over the line and paint it. That's the version that reopens by next summer. Doing it right means cutting out the old failed tape, re-taping the joint with mesh or paper, bedding it in compound, and feathering it out wide so there's no ridge left behind. Then we match the texture. Most Allen homes are knockdown or a light orange peel. Prime it, paint it, and you stop seeing it.
Here's the part that matters most. If we come out and the signs point to real foundation movement, the diagonal cracks, the sticking doors, the stair-steps in the brick, we'll tell you straight, and we'll tell you to get a foundation company or a structural engineer out before we patch a thing. Patching drywall over a foundation that's still moving is throwing money away. It'll just crack again in a few months. We'd rather lose the little job and keep your trust. When you're ready, you can see how we handle drywall repair and finishing for the rest of the house too.
So if a crack showed up this summer and you don't know which kind you've got, don't lose sleep over it. Send us a photo or call (469) 242-3276, and we'll help you sort out whether it's a Saturday patch or a reason to call somebody with a level and a clipboard.