1
Perimeter Slab Settlement After Drought
Serious The outer edges and corners of a slab sink as the clay underneath dries and shrinks. The perimeter beam loses support, the house tilts toward the low corner, and cracks spread through the walls and the brick veneer.
Why it happens here The Houston Black and Burleson clays west and north of Elgin can lose a lot of volume during a long dry spell. In 2011, and again in 2022–2023, the clay dried out well below the depth of a typical slab beam. Corners dropped first, because they're the most exposed to sun and wind. Big live oaks and pecans near the house make it worse, since their roots pull moisture from under the foundation. Gutters that dump water at one corner while another corner bakes create uneven support too.
Signs to watch for - Stair-step cracks in brick mortar
- Gaps between the frieze board and brick
- Diagonal drywall cracks at door and window corners
- Doors that stick or won't latch
- Soil pulling away from the slab edge
- Windows out of square
Local patterns We see this a lot in 1970s–1990s brick ranch homes in older Elgin neighborhoods and in Taylor. It also shows up on lots in Manor and Pflugerville that have big shade trees close to the house. It usually shows up late in summer or the season after a drought.
Our fix Pressed concrete or steel piers under the settled beam, careful lifting back toward level, and drainage and watering fixes so the clay stays more stable year-round.
2
Slab Heave and Interior Doming
Serious Instead of sinking, the middle of the slab gets pushed up as the clay underneath takes on water and swells. Floors get a hump in the center, interior doors bind, and people often mistake it for settlement.
Why it happens here Elgin's rain comes in heavy bursts after long dry spells. Clay that shrank during a drought can swell fast when a flood like Halloween 2013 or Memorial Day 2015 rolls through. The center of the slab stays wetter than the edges, so it rises. Under-slab plumbing leaks, especially the ones from the February 2021 freeze, keep feeding water into one spot. Piering a heaving slab as if it were settling can lock the problem in, so getting the diagnosis right matters.
Signs to watch for - Floor hump near the center of the house
- Cracked tile in interior rooms
- Interior doors rubbing at the top
- Cracks over interior doorways
- Higher water bills or a damp-smelling floor area
- Baseboards separating from the floor
Local patterns This happens most in post-tensioned slab homes in ShadowGlen, Harris Branch and Saratoga Farms. It also turns up in older slabs with cast-iron drain lines. Problems often appear a few months after a wet spring or after a plumbing leak.
Our fix An elevation survey and a licensed plumber's leak test first. Then we fix the water source and drainage, and level the low areas to the heaved section instead of jacking the high spot.
3
Rotted or Sinking Pier-and-Beam Supports
Moderate The original cedar, wood-block or stacked-brick piers under older homes rot, crumble or sink into the ground. The beams above lose support, and you get sagging, bouncy floors and damaged sill plates.
Why it happens here A lot of Elgin's original houses date to the railroad days, between the late 1800s and the 1940s. Builders back then set floors on cedar stumps or loose brick laid right on the clay. A century of humid summers, poor crawlspace airflow and shrink-swell soil wears those supports out. Brick piers lean as the clay moves, and wood piers rot from the bottom up. Many homes also have shims added over the decades that have dried out or slipped.
Signs to watch for - Sagging or bouncy floors
- Sloped floors you can see with a marble or level
- Gaps under interior doors
- Cracked plaster or drywall
- Visibly leaning piers in the crawlspace
- Musty smell coming up through the floor
Local patterns This is the most common problem in Historic Downtown Elgin's bungalows and folk Victorians. We also see it in downtown Taylor, in older Bastrop homes, and in farmhouses around McDade and Coupland that have been in the same family for generations.
Our fix Replace failed piers with concrete pier pads, re-shim with steel or hardwood shims, sister or replace damaged beams, and relevel while keeping as much original framing as possible.
4
Washout and Erosion Under Slabs on Sandy Soil
Serious Runoff carries away the sandy soil under a slab or pier footing and leaves gaps behind. The foundation loses support unevenly, sometimes fast, and you'll often see voids open up at the slab edge.
Why it happens here South and east of Elgin, toward McDade, Bastrop and Camp Swift, the sandy loam drains fast and erodes easily. Heavy May–June storms send sheets of water across lots with poor grading. When that water flows toward or along the house, it scours soil out from under the beam. Some lots have sand over clay, so one side of the house washes out while the other side sits on clay that swells.
Signs to watch for - Visible gaps under the slab edge
- Exposed beam face where soil used to be
- Erosion channels next to the foundation
- Settling on just one side of the house
- Puddles that drain toward the slab
- Cracks that get wider after big storms
Local patterns We see this in the Lost Pines area of Bastrop, including Tahitian Village. It also shows up on Camp Swift acreage and on rural McDade properties with long, sloped driveways and no gutters.
Our fix Fill the voids, add piers where support has been lost, and regrade, add gutters or install French drains to send water away from the foundation.
5
Early Cracking in New Post-Tensioned Slabs
Moderate Homes built in the last ten years show cracks in drywall, tile or the slab itself because the lot was prepared badly. The usual causes are loose fill, poor compaction, or grading that sends water back toward the house.
Why it happens here Construction along US-290 and SH-130 has moved very fast. Lots in Manor, Pflugerville, Hornsby Bend and eastern Austin were cut into raw Blackland clay and built on quickly. Newly disturbed clay settles, and fill that wasn't compacted properly keeps compressing for years. Post-tensioned slabs hide a lot of small movement, but they still crack once it adds up. Working on these slabs also takes care, because cutting a tendon is dangerous and expensive.
Signs to watch for - Hairline drywall cracks within 1–5 years
- Cracked tile or grout lines
- A gap opening between the slab and garage apron
- Sticking patio or closet doors
- Water pooling near the foundation after rain
- Builder repairs that keep coming back
Local patterns We get the most calls about this from ShadowGlen, Presidential Glen, Wildhorse Ranch, Falcon Pointe, Blackhawk and Saratoga Farms. Owners are often deciding whether to file a builder warranty claim or protect resale value.
Our fix Take elevation readings and document them first. Then add targeted piering only where it's needed, drilling carefully around the tendons, plus fixes for any lot drainage problems.
6
Crawl Space Moisture and Ventilation Failure
Moderate Too much humidity, standing water or a missing vapor barrier under a pier-and-beam home. Over time it softens wood, feeds mold, and wears out the beams, joists and sill plates that hold up the house.
Why it happens here Elgin's humid summers and heavy spring rains put a lot of moisture into crawlspaces. Many older homes have blocked or damaged vents, no vapor barrier, and gutters draining right at the skirting. Pipes that burst in 2021 sent water straight into many crawlspaces, and in a lot of cases nobody dried it out properly. Wet clay in the crawlspace also swells under the piers.
Signs to watch for - Musty odors inside the house
- Visible mold or mildew on joists
- Standing water or damp soil under the house
- Soft or spongy floor spots
- Torn or missing vapor barrier
- Cupping hardwood floors
Local patterns This is common in older homes in Historic Downtown Elgin, Bastrop, Taylor and Webberville. It's also common in rural farmhouses with skirting that's been patched again and again over the years.
Our fix Restore drainage, install a vapor barrier, repair or improve the vents, and replace rotted framing members.
7
Minor Slab and Wall Cracks
Minor Thin shrinkage cracks in garage slabs, exposed foundation walls or beam faces that haven't moved out of plane. These are usually cosmetic, but they can let in water and are worth watching.
Why it happens here Concrete shrinks as it cures, and Elgin's big temperature swings, from 100 °F+ summers to freezes like 2021, open and close small cracks every year. Brick-heavy local construction shows these cracks easily. Many of them are harmless, but some are the first sign of real movement.
Signs to watch for - Hairline cracks under 1/8 inch
- Cracks that stay the same width over time
- No offset between the two sides
- Small chips at the slab corners
- Efflorescence or staining along crack lines
Local patterns We see these everywhere in our service area, but most often in garage slabs and exposed beam faces on homes from the 1980s through the 2000s in Elgin, Taylor and Pflugerville.
Our fix Seal or patch with epoxy or polyurethane, then keep an eye on it. If a crack starts widening, an evaluation will tell you whether it's structural.