Foundation Maintenance Checklist for Central Texas

Our expansive clay swells when it takes on water and shrinks when it dries, and it does this every year with the seasons. You cannot stop the clay from reacting to moisture. What you can do is keep the moisture around the foundation from swinging wildly and unevenly, because that unevenness is what actually damages a house. The Foundation Performance Association's maintenance guidance states it in one line: uniformity is the key. Uniform moisture produces uniform movement, and uniform movement creates little distress. Everything below is a practical way to hold that uniformity through a Central Texas year.

Keep the soil moisture uniform

This is the principle the whole checklist hangs on, so it is worth understanding before the tasks. When the clay under one side of your house dries and shrinks while another side stays moist and swollen, the slab is being pushed and pulled in different directions at once. That is what opens cracks and tips floors. If instead the moisture rises and falls evenly all the way around the perimeter, the house tends to move as one piece and comes back with the seasons. The Foundation Performance Association's maintenance guide is direct that non-uniform moisture is the driver of foundation distress on expansive soil, and that keeping moisture uniform on all sides is the homeowner's main lever. Read the rest of this list as answers to a single question: what would make the moisture around my house uneven, and how do I stop it?

Water consistently through drought

In a Central Texas summer the perimeter clay dries out first, and it dries fastest on the sunny sides and near thirsty plants. Left alone, one side of the house can shrink while a shaded or irrigated side stays full, which is exactly the unevenness you are trying to avoid. Consistent watering during dry spells keeps the clay from shrinking hard on one side. The emphasis is on consistent and even, not heavy. Water all sides of the house on a regular schedule rather than soaking the one side where the grass browned. A soaker hose set out a short distance from the slab, run for a set time on a timer, delivers the slow, even moisture clay wants far better than an occasional flood.

There is a limit in the other direction. The Foundation Performance Association's Owner's Guide is equally clear that you should not overwater the soil right against the foundation, and that sprinkler heads pointed at the slab or spraying flatwork and gravel just add uneven moisture. Aim sprinklers out and away, and if a bed against the wall needs water, deliver it evenly. The target is steady, not soaked.

Manage drainage so water leaves the perimeter

Watering handles drought. Drainage handles the rain, and it matters just as much. Water that ponds beside the house or runs toward it soaks a strip of clay while the rest stays drier, which is the same unevenness watering is meant to prevent, only in the wet direction. The maintenance habits here are simple. Keep the ground sloping away from the foundation so rain runs off rather than collecting. Keep gutters clean and make sure downspouts discharge well past the slab, not into the bed beside it. Do not let landscape edging, raised beds, or built-up mulch dam water against the wall. The Foundation Performance Association's maintenance guide specifically warns against metal edging and other damming devices within about five feet of the foundation on expansive soil. If your grading or gutters need real work rather than upkeep, that crosses into our drainage correction service, and our deeper guide to foundation drainage in San Antonio covers the how and why in full.

Hold trees and roots at a sensible distance

A big tree is a moisture pump. In dry weather its roots pull large volumes of water out of the clay, and if it sits close to the house it can dry one side while the rest stays moist, tilting the slab toward the tree over years. The Foundation Performance Association's Owner's Guide offers distance guidance to plan around: keep large canopy trees at least twelve feet from the foundation, smaller understory trees at least eight feet, and shrubs at least two feet. Roots commonly reach at least to the edge of the canopy and can extend further, so the canopy line is a fair mental guide to where the drying happens.

Where a tree already sits closer than ideal, a root barrier installed between the tree and the house can help limit how much moisture its roots draw from the foundation soil, and directing most irrigation away from the foundation encourages roots to grow toward the water instead of toward the slab. One caution the guide raises is worth repeating: removing a large tree near the house is not automatically a fix, because the soil that the tree kept dry can slowly take on moisture again and heave. If a mature tree near the foundation is a concern, it is worth planning the work rather than just cutting it down. Our page on tree roots and foundation movement goes deeper.

Seal the joints and watch the small stuff

A few small items round out the routine. Seal the joint where flatwork meets the foundation. The Foundation Performance Association recommends sealing the joints between driveways, patios, walkways, and pool decks and the foundation edge, because an open joint lets rainwater run straight down beside the slab and into the supporting soil. A flexible sealant there is cheap and keeps water on the surface where your grading can carry it off. Provide even ground cover around the house too, extending it out from the foundation, so the soil does not dry faster in a bare patch than under nearby turf or mulch, which the maintenance guide notes helps keep evaporation uniform. And fix plumbing and irrigation leaks quickly, since a hidden leak feeds moisture to one spot around the clock, the definition of non-uniform.

Under a pier and beam house, the same thinking applies below the floor. A damp, unevenly moist crawl space works on the structure the way an uneven perimeter works on a slab, so crawl space moisture control and the maintenance in our pier and beam maintenance guide are this checklist applied under the floor.

Walk your perimeter and keep a baseline

The last habit costs nothing and catches problems early. Once a season, and after any big rain, walk the outside of your house and look at the soil, the grading, the gutters, and the base of the walls. Once a year, photograph any cracks with a coin for scale so you have a baseline to compare against next year. Cracks that hold steady are usually just the house living with the seasons. Cracks that keep widening, new sticking doors, or a floor that starts to feel like it is sloping are the cues to get a measurement.

When you do want a professional read, our elevation survey is free and takes about an hour, and it doubles as a periodic checkup. About a third of our inspections end with no repair needed, so a maintenance-minded homeowner often hears exactly what they hoped to: keep doing what you are doing, the house is fine. Good maintenance is the cheapest foundation work there is, and it is almost all about keeping the soil evenly moist.