Helical pier foundation repair in Houston

Helical pier foundation repair means screwing steel shafts with spiral plates into the ground beside a sinking foundation, turning them down until the torque shows they've reached soil that can hold the load, then bracketing them to the house and lifting it back toward level. It suits lighter loads, pier-and-beam homes, porches and additions, and spots where a push pier can't get enough weight to drive against. This page walks through the job itself: the steps, how the pier count is set, what the building code asks for, buying piers, and the concrete options. For the full range of pier types, start with foundation piers in Houston.

How does helical pier foundation repair work?

A crew digs a small hole at each pier spot, sets the helical pier against the foundation and screws it down with a hydraulic torque motor, adding extension sections as it goes. They read the torque until it reaches the target the design sets. Then a steel bracket ties the pier to the beam or slab edge, the house is lifted, the brackets are locked, and the holes are backfilled.

A typical job on a Houston house:

1. Assessment. A contractor or structural engineer measures how far the floor has dropped, marks where each pier goes and sets the target torque and depth.
2. Permit. Inside the City of Houston, foundation repair runs under a building permit; the city's weekly permit reports list foundation repair permits every week.
3. Excavation. A hole is dug beside the grade beam at each mark, or under the beam from the crawl space on a pier-and-beam house.
4. Installation. The lead section, which carries the plates, is screwed in first. Extensions are bolted on until the pier reaches the design torque.
5. Bracketing and lift. A bracket joins each pier head to the foundation. Hydraulic jacks lift the house a little at a time, all piers together.
6. Lock off and backfill. Brackets are fixed at the final height, the jacks come off, and the soil goes back.
7. Records. You get a log showing each pier's depth and final torque.

When is a helical pier the right repair for a Houston house?

A helical pier is the right repair when the part of the house that's sinking is too light to push a steel pier against, or when the pier also needs to resist uplift. That makes it a frequent choice for pier-and-beam homes, porches, garages, room additions and one-story wings. Heavy slab houses with brick veneer usually take push piers or pressed concrete piers instead.

The ground matters as much as the house. Much of Houston sits on expansive clay such as the Lake Charles series, which the USDA describes as 45 to 60% clay that cracks open when dry, with cracks reaching 12 inches or more deep. A helical plate must sit below that moving layer or it rides up and down with it, and stiff clay or buried debris can stop plates short. The side by side comparison with push piers is on helical vs push piers, and work under older raised houses is covered on pier and beam foundation repair.

How many helical piers do I need?

The number of helical piers depends on how much of the foundation has moved, how heavy that section is, and what each pier can carry in your soil. A sunken porch might need only a few. A whole side of a house can need many more. Spacing comes from dividing the wall's load by each pier's design capacity, so a sound count comes from a design, not a rule of thumb.

What changes the count:

Ask each contractor to mark every pier on a plan. Very different counts often mean one quote covers the whole failing section and the other only the worst corner. A structural engineer foundation inspection settles it.

What are steel helical piers, and how is their capacity checked?

Steel helical piers, also called helical piles or screw piles, are steel shafts with one or more round bearing plates welded on like a screw thread. The shaft carries the load down; the plates bear on firm soil. The International Building Code, which Texas uses, requires that shaft size and the number, size and thickness of plates be enough to support the design loads.

The code gives several ways to set a helical pile's capacity and takes the lowest. Among them: the plates' bearing area against the soil, correlations with installation torque, load tests where required, and the strength of the shaft, its couplings and the plates themselves. Section 1810.4.11 says helical piles are installed to the embedment depth and torque set by a registered design professional, and the torque used must not exceed the manufacturer's rated maximum. Section 1810.4.12 calls for special inspection of helical piles. So ask to see the torque and depth for every pier.

Where can you buy helical piers?

You can buy helical piers from foundation and construction supply distributors, and smaller ones for decks and sheds are sold through home improvement stores and online. Repair-grade piers for lifting a house usually come through distributors who supply contractors, along with the brackets and torque equipment. Buying them is easy; installing them under a house is where homeowners get stuck.

A house pier needs a hydraulic torque motor, a torque reading and a design that sets the target, then an even lift with jacks at every pier. Done badly, the slab or drain lines can crack. A small helical pier under a deck post or shed is a fair DIY job; a house needs a permit and a contractor. See DIY foundation piers.

Are concrete block or precast concrete piers an alternative?

Yes, in some cases. Precast concrete piers, pressed down in stacked cylinders, are the most common slab repair in Houston and cost less per pier than steel. Concrete block piers, stacked on a footing, are the traditional support under pier-and-beam houses. Both work, but they stop shallower than steel piers, so they're more exposed to the clay's swelling and shrinking.

The options side by side:

A precast pier block for a shed sits on the ground and spreads a light load. The code sets an 8 inch minimum width for precast concrete deep foundation elements, so house piers are a different product. More on pressed piers is on concrete foundation piers.

What are the disadvantages of pile foundation?

Pile foundations, helical piles included, cost more per support than shallow footings, need specialist equipment and a design, and their final depth isn't known until each one is installed. In repair work they also only steady the part of the house they sit under. If the rest of the foundation keeps moving, new cracks can open beside a repaired section.

Helical piers add a few of their own. Each costs more than a pressed concrete pier: the Houston Press guide puts steel piers at $1,000 or more each against $300 to $600 for concrete, and This Old House puts piering at $1,000 to $3,000 per pier nationally. Plates can stop short in dense layers. And the steel needs a protective coating to slow corrosion in wet ground. These figures are a guide; the written quote sets the real price, and the full picture is on pier foundation cost.

For a helical pier quote, ask for a written quote and we'll arrange a visit from a local foundation contractor.