Common Foundation Warning Signs Houston Homeowners Ask About

No, and this is the single most important thing on this page. Many cracks in Houston homes are cosmetic, seasonal, or the product of original construction rather than ongoing foundation movement. Sheetrock cracks from framing shrinkage as lumber dries. Hairline cracks appear in concrete as it cures and continue appearing for years. Mortar cracks from thermal movement in a brick veneer. Tile cracks over a control joint doing exactly what a control joint does. Plaster cracks in an older home because plaster is brittle and the house is not. All of those look like foundation cracks to someone worried about their foundation. What separates an observation from a finding is not how the crack looks. It is whether the floor plane is actually out, in what pattern, and whether the visible distress is consistent with that pattern. A relative elevation survey establishes the first two. Site conditions and history inform the third. Appearance alone cannot do any of it, which is why we will not tell you over the phone whether your crack is serious.

There is no such width, and anyone quoting one to you is using a rule that does not exist in any defensible form. You will find figures circulating — a quarter inch, an eighth of an inch, a credit card thickness — and they are marketing heuristics rather than engineering criteria. A hairline crack that has appeared recently and is lengthening steadily may be more informative than a wider crack that has been stable for fifteen years. A narrow crack in a specific location and orientation may indicate something a wide crack elsewhere does not. What actually carries information is location, orientation, pattern across the structure, and change over time. A stair-step crack at a corner reads differently from a vertical crack in the middle of a wall. Distress that appears at several door corners on one side of a house reads differently from a single crack in isolation. And a crack that measured the same last spring as it does this spring is behaving differently from one that has doubled. This is why we ask you to document with dates and a scale reference, and why re-measurement matters more than a single measurement.

Take photographs you can genuinely compare later, which takes slightly more thought than a quick snap. Include something for scale in the frame — a coin, a ruler, a tape measure — right beside the crack, because a close-up of a crack with no reference is almost useless for comparison. Photograph from a consistent position and distance, and make a note of where you stood so you can return to the same spot. A wider shot showing where the crack sits on the wall matters as much as the close-up, because location is information. Make sure the date is recorded, either in the file metadata or by writing it down. Then repeat the exercise on a schedule: roughly quarterly is sensible in Houston, because that captures the seasonal cycle. Alongside the photographs, keep a short written note of other observations: which doors have started catching, when you first noticed, whether anything changed after a plumbing repair or a tree removal or a very dry summer. That written record is often more useful than the images.

No, and treating them as universal is how people end up with unnecessary repairs. The same observation means different things depending on the foundation type, the age and construction of the house, what has happened to the property before, and the site conditions around it. A sloping floor in a 1925 pier-and-beam bungalow that has never been level is not the same finding as a sloping floor that has developed over two years in a 2015 slab home. Sticking doors in a house with plaster walls during a humid week behave differently from sticking doors that have persisted through a full year. A crack above a window in a brick veneer means something different from a crack in a structural masonry wall. Context is why an evaluation involves history, site conditions, and foundation type alongside the measurements, and why a photograph sent to a contractor cannot substitute for it.

Have them evaluated first, then seal them if that is the appropriate answer. Sealing a crack hides the symptom. If the crack is genuinely cosmetic, sealing is fine and appropriate maintenance. If it is an indicator of movement, sealing removes your ability to track whether it is changing, which is the most useful information available to you. A sealed crack that reopens tells you something, but you have lost the interval in between. There is also a sequencing point: cosmetic repair after structural stabilisation is normal work, and cosmetic repair before it usually has to be redone. Recurring cracks after patching, where the same line reopens in the same place, are themselves informative. They suggest the underlying movement is still active rather than resolved, which is worth reporting at the next evaluation rather than patching again. If a repair is likely, doing the cosmetic work first wastes money.

It can be either, and the distinguishing test is seasonality. Wood swells with humidity, and Houston humidity varies enormously through the year. A door that binds during a humid stretch and operates normally when things dry out is behaving like wood responding to moisture. A door that has bound and stayed bound regardless of season, or that has progressively worsened over a year or more, is more consistent with the frame moving out of square. Where it binds is also informative: a door rubbing at the top on the latch side suggests a different geometry from one rubbing along the entire latch edge. Note which doors, where they rub, when it started, and whether it recovers. Our sticking doors and windows guide covers what to look at.

Not always. Stair-step cracking follows mortar joints because mortar is weaker than brick, so movement in a brick veneer tends to express itself along the joint line. That pattern is common where there is differential movement, but it also appears from thermal expansion and contraction, from settlement of a veneer ledge, and from original construction issues. What matters is where the stair-step sits, which direction it runs, whether the wall is displaced in or out of plane at the crack, whether it corresponds to interior distress in the same area, and whether it is changing. A stair-step that has been stable for a decade with no interior counterpart reads differently from one that appeared last year alongside interior cracking on the same elevation.

You can get an impression, and it is worth doing. Rolling a ball or a marble across a floor tells you whether there is a noticeable fall and roughly where. A long spirit level will confirm a slope over its own length. What neither gives you is a relative elevation survey across the whole floor plane referenced to a benchmark, which is what establishes the pattern — where the high point and low point are, how the transition happens, and whether it is a single tilt or a bowl or a ridge. That pattern is what distinguishes settlement from heave, and it is what a survey provides. Your own check is useful for deciding whether to have it measured. It is not a substitute for the measurement.

Timing is genuinely useful information and worth recording, but it does not establish a cause on its own. Houston clay responds to moisture, so it is entirely expected that distress becomes more noticeable after an extended dry spell or a prolonged wet period. Distress that appears in one and partly recedes in the other is behaving seasonally. Distress that appeared after a storm is not thereby proven to be storm damage — the storm may have made existing movement visible rather than causing it. We record the timing alongside the measurements and treat it as context rather than as a conclusion.

A wet patch on the floor, a warm spot, unexplained water usage, or persistently damp soil in one area can all point toward an under-slab plumbing issue. None of them proves one. A plumbing slab leak and a structural foundation problem are different issues needing different assessments, and they sometimes occur together. Where leak symptoms dominate, a plumbing assessment usually comes first, because ruling a leak in or out changes what the structural picture means. We will tell you which sequence makes sense rather than selling you the assessment we happen to perform.

There is no universal answer, but a seasonal cycle is the useful unit in Houston. Distress that opens through a dry summer and partly closes after a wet autumn is telling you something different from distress that has only ever got worse. Documenting through one full cycle, with dated photographs and a written note of door operation, gives you a real comparison. That said, if distress is visibly progressing over weeks rather than months, if doors have stopped functioning, or if you can feel a floor slope that was not there before, measuring sooner is sensible. And if you are mid-transaction, waiting is not an option — get it measured.

No, and a monitoring conclusion is a common and legitimate outcome. If the elevation survey shows a floor plane within a normal range and the visible distress is consistent with cosmetic or seasonal causes, the report says to monitor, tells you what to watch, and recommends when to re-measure. You keep the readings as a baseline, which makes the next survey genuinely comparable. That baseline is worth having whether or not repair is ever warranted.