Signs of Foundation Problems in a Houston Home
A new crack over a doorway or a bedroom door that suddenly sticks can make any Houston homeowner nervous. Foundation movement is common in this region, but not every crack means the foundation is failing. Houses also crack from framing, lumber shrinkage, temperature swings and plain old settling of finishes. The goal is to notice the right signs, record them, and know when it is time for a professional evaluation.
This guide walks through the signs to look for outside and inside the house, the ones that are often blamed on the foundation by mistake, and a few simple checks you can do with a level and a camera. It is general information, not an engineering evaluation of your home. For background on why local soil moves, see our article on Houston clay soil and your foundation.
Why Houston homes show these signs
Much of the Houston area sits on expansive clay. A Texas A&M AgriLife Extension horticulturist in Galveston County describes in this article on drought and home foundations how gumbo clay swells in wet spells and shrinks in dry ones, and how watering one side of a house while another side dries out can lead to cracking brick veneer, doors and cabinets falling out of alignment, and cracks in drywall and tile floors. Uneven moisture under a slab is the engine behind many of the signs below.
Outside the house: what to look for
Walk all the way around the house in daylight and look for:
- Cracks in brick veneer, especially stair-step cracks along mortar joints and cracks that run through bricks.
- Uneven gaps between window or door frames and the surrounding brick, or frames that look out of square.
- Separations around garage doors, particularly wide double doors.
- Mortar patches that are a different color than the original, which can mean earlier cracks were repaired.
- Cracks in the exposed concrete below the brick, called the grade beam.
- Soil pulling away from the slab edge during dry weather.
The Foundation Performance Association, a Houston group of engineers and other professionals, lists these items in its homebuyers' guide for foundation evaluation. The guide suggests recording the length, width and location of brick cracks, noting whether a crack is wider at the top or bottom, and using coins, credit cards or a tape measure to estimate width. It also says hairline cracks in grade beams are generally acceptable but may indicate some movement.
Inside the house: what to look for
Inside, the signs tend to show at openings and corners:
- Diagonal drywall cracks running from the corners of doors and windows.
- Doors that stick, swing open or closed on their own, or will not latch, and gaps at the top of a door that are wider on one side.
- Sloping floors you can feel or see, or cracked floor tile in a line.
- Cabinets or countertops pulling away from the wall or tilting.
- Gaps between walls and ceilings, or baseboards separating from the floor.
- Patched or freshly painted areas in closets and corners, which may cover earlier cracks.
The same FPA guide says diagonal drywall cracks are significant indicators of excessive foundation movement, while buckled tape, separations at tape joints and small hairline cracks are more often related to drywall installation, wood shrinkage or initial settling.
Signs that are often blamed on the foundation by mistake
Some cracks look alarming but have other causes. The FPA's paper on distress often mistakenly attributed to foundation movement, written by Houston engineers for southeast Texas homes, lists examples such as:
- Cracks in brick above long openings like garage doors, which can come from an undersized or overloaded lintel.
- Vertical cracks running the full height of a brick wall with an even width, which can come from thermal expansion when expansion joints are missing or blocked.
- Spalled concrete at a slab corner under brick, which can come from brick bonding to the ledge as it expands and contracts.
- Sagging or cracked drywall ceilings, which can come from undersized beams, overloaded attics or loose nails.
- Cracks along vaulted ceilings, which can come from roof framing movement with temperature.
That does not mean these cracks can be ignored. It means the fix may be a framing or masonry repair rather than foundation work, which is why diagnosis comes before any repair plan.
Simple checks you can do yourself
You do not need special equipment to start a useful record:
- Use a level on the floors. The FPA homebuyers' guide (linked above) suggests checking floors with a four-foot carpenter's level and notes that more than about 1/4 inch of slope over four feet may be a sign of unacceptable movement that should be checked by a professional engineer, as covered in that FPA guide.
- Photograph and date cracks. Put a piece of tape with the date next to each crack and take a photo. Retake photos every few months to see if anything changes.
- Mark crack ends with a pencil line so you can tell if they grow.
- Check drainage after a rain. Watch where water goes around the house and whether downspouts and sprinklers send water away from the slab.
- Look at nearby trees. Large trees close to the house draw moisture from the clay, and recently removed trees can let the soil swell.
Plumbing leaks can look like foundation problems
Leaks under a slab can soften soil and cause localized movement, and sewer line problems are common in older homes. The FPA homebuyers' guide suggests a hydrostatic plumbing leak test if you suspect movement or if the home was built before 1985. If a leak is found, fixing it comes before or alongside any foundation repair.
When to call a professional
Consider an evaluation by a structural engineer when you see several signs together, cracks that keep growing, doors that newly stop latching across several rooms, noticeable floor slope, or new brick cracks near windows and doors. An engineer may perform an elevation survey and a distress survey to see how the foundation has moved, and may recommend a second survey later to confirm whether movement is ongoing. Our guide to what drives foundation repair cost in Houston explains how that diagnosis shapes the repair scope, and our comparison of pier and beam vs slab in Houston covers how each system shows movement.
FAQ
Are all cracks in a Houston house a foundation problem?
No. Many hairline drywall cracks come from lumber shrinkage or drywall installation, and some brick cracks come from lintels or thermal movement. Patterns and changes over time matter more than a single crack.
What is the most telling sign of foundation movement?
Several signs together, such as diagonal cracks at door and window corners, sticking doors and sloping floors in the same part of the house, are stronger signals than any one item.
Should I water my foundation?
Keeping soil moisture steady around the house is widely recommended for expansive clay. Use slow, even watering away from the slab edge, and avoid flooding cracks or gaps directly.
Can foundation signs come and go with the seasons?
Yes. Cracks and sticking doors can open in dry months and close in wet months as the clay shrinks and swells. Seasonal photos help show the pattern.
Who should I call first?
For an unbiased diagnosis, many homeowners start with a structural engineer, then get repair proposals based on that report.
Planning a foundation check or repair in Houston? BPC Development LLC provides free on-site estimates in Houston, TX. Call (281) 301-4737.