Why Are Tie Rod Holes Leaking in My Basement Wall?

Tie rod holes leak because a piece of steel from the original concrete forms is still inside your wall, and water can travel along it. Snap ties like Dayton Superior's A3 are broken off about an inch below the surface once the concrete sets, according to the company's forming accessories handbook, which leaves a small hole and a steel stub behind. A tie rod leak in a basement can start when that hole was poorly patched, the steel begins to rust, or wet soil pushes water against the outside of the wall.

The same handbook explains why this happens even in walls that were poured well. Dayton Superior says any of its snap ties can be made with a tight-fitting neoprene washer near the center, and that this water-resistant tie "is designed to help eliminate water seepage along the tie by breaking the surface continuity of the wire." In other words, the manufacturer treats the tie itself as a path water can follow through the wall, and a plain tie has nothing to stop it. Below, we cover what these ties are, why they leak, why leaks tend to show up in certain seasons, how the holes are sealed, and when a wet tie hole points to a bigger problem.

What Are Tie Rod Holes in a Poured Concrete Wall?

Tie rod holes are the small round marks left in a poured concrete foundation where metal form ties held the two sides of the wall forms together during the pour. Contractors call the ties snap ties, form ties or tie rods.

Dayton Superior describes its snap ties as metal rods with heads that connect the form panels and hold the wall at the right thickness. After the concrete sets, the ends are snapped off inside the wall. The handbook lists a nominal 1-inch breakback for its standard A3 tie, with shallower breakbacks by special order. Steel Dog's DB Resi-Tie, made for 1-1/8 inch form panels, has a 1-1/2 inch breakback.

You can usually spot them in a pattern. Emecole, a maker of concrete repair products, notes that tie holes sit along the vertical seams where form panels met, with the rows typically two, three or four feet apart. If your wet spots line up in neat rows, tie holes are a likely source.

Why Does a Tie Rod Leak Start?

Water follows the steel

The tie runs all the way through the wall. When the outside of the foundation is wet, water can move along the boundary between the steel and the concrete. That is the path the neoprene washer in Dayton Superior's water-resistant tie is meant to interrupt.

The steel rusts

Standard ties are not built to resist rust. Dayton Superior sells stainless options for jobs that need ties resistant to rusting. The American Concrete Institute explains that rust "occupies a greater volume than the steel and exerts destructive stresses on the surrounding concrete," and that corrosion can occur when moisture, oxygen and chloride ions are present. A rusting tie can loosen the concrete around it and widen the path for water. Orange or brown streaks below a tie hole suggest the steel is rusting.

The bond broke during construction

Emecole notes that round ties used in cold weather can be a problem, because spinning the ties to remove them can break the bond between the concrete and the steel rod. The result, in the company's words, can be "a whole wall of leaking ties."

The patch failed or was never there

Dayton Superior sells a plug made to patch plastic cone tie holes, a sign the holes are meant to be filled once the forms come off. A patch that has pulled away, or one that was never installed, leaves a direct opening.

Pressure from wet soil

The University of Minnesota Extension points out that the water table below grade "can also rise due to flooding or seasonal site conditions." When the soil against your wall is saturated, water presses on the concrete and uses the easiest opening it can find. Our post on why hydrostatic pressure is so dangerous explains that force in more detail.

Why Do Tie Rod Holes Leak More in Certain Seasons?

A tie rod hole can stay dry for months and then drip for a week. The weather around Pittsburgh helps explain it. NOAA's 1991 to 2020 normals for Pittsburgh International Airport show 39.61 inches of precipitation a year, with the highest monthly totals in June (4.12 inches) and July (4.26 inches). The same normals list 44.1 inches of snow a year, with 13.3 inches in January and 11.7 inches in February on average.

Put together, that means soil around a foundation can stay wet in late winter and early spring as snow melts, then get soaked again by early summer storms. To sort out where the water is coming from, our guide on how to tell if basement water is coming from outside or inside walks through simple checks.

How Are Leaking Tie Rod Holes Sealed?

The right fix depends on how much water is moving, whether the steel is badly rusted, and whether you can reach the outside of the wall.

Injection from inside

Polyurethane injection is one approach for active leaks. Sika's leak sealing brochure explains that its polyurethane injection resins have a "fast expansive reaction with water" that "forms a tough and flexible/elastic foam," with free-foaming expansion of up to 40 times in contact with water. Sika markets these resins for sealing leaks in concrete, and the reaction with water is what lets them work in a wet spot.

Surface patching from inside

For smaller leaks, Emecole describes coating the surface of the hole with a two-part epoxy or urethane paste, or even hydraulic cement. A surface patch treats the opening on your side of the wall, so how long it lasts depends on how well it bonds and how much water pressure is behind it.

Work from the outside

Sika's brochure also describes curtain injection, which places material behind the wall to seal leaks from multiple tie bar holes or other small defects. Ask a contractor whether your wall is a candidate.

When Is a Leaking Tie Hole a Sign of Something Bigger?

A damp tie hole by itself is a local leak. The University of Minnesota Extension notes that "concrete and concrete block foundations usually develop some cracks," so check the wall near leaking ties for cracks, especially ones that run from a tie hole or connect several of them.

Pay attention to:

• A crack that runs through or between tie holes

• Rust staining that grows or concrete that flakes around a tie

• Water at several ties at once, plus water at the floor joint

• A wall that bows or leans inward

Our article on what basement wall cracks mean for your home explains which cracks deserve a closer look, and how basement wall crack repair is done in Pittsburgh describes the repair side. If water is also coming up through the slab, see how to stop water from entering through floor cracks.

What Can You Do Before Calling a Professional?

Start outside, because less water at the wall means less water at the ties. The Department of Energy's Building America Solution Center recommends that downspouts discharge at least 5 feet from the foundation, or underground at least 10 feet away, and that the ground slope away at least half an inch per foot for the first 10 feet. If a downspout empties right above a row of leaking ties, fix that first.

Inside, take photos of each wet tie hole during a storm and note the date. That record shows whether the leaks track with heavy rain or snowmelt, which helps whoever inspects the wall. Keep stored items off the floor near the wall until the leak is fixed.

If the same holes keep leaking, a basement waterproofing professional can look at the wall, the ties, and the drainage around the house together. For walls that are cracked, bowed or leaning, foundation repair may be part of the answer.

FAQ

What is a snap tie in a basement wall?

A snap tie is a metal rod that held the concrete forms together while your foundation was poured. The ends were broken off inside the wall after the concrete set, leaving a small hole and a steel stub.

Are leaking tie rod holes a structural problem?

On their own, they usually point to a water problem rather than a structural one. Cracks running through the holes, spreading rust damage or a bowing wall call for a closer look by a qualified professional.

Why do I see rust stains under tie holes?

The steel stub left in the wall is rusting. The American Concrete Institute notes that rust takes up more space than the original steel and stresses the concrete around it, which can make a leak worse over time.

Can I fix a leaking tie rod hole myself?

Some homeowners patch dry or lightly damp holes with products sold for the job. An actively leaking hole, a rusted tie, or a wall with many wet ties is harder to seal for good, and a professional can tell you whether injection or exterior work is needed.

Why does my tie rod hole only leak in spring?

Snowmelt and spring rain can saturate the soil against your wall, and the University of Minnesota Extension notes the water table can rise with seasonal conditions. Around Pittsburgh, NOAA normals show heavy snow in January and February followed by rising monthly rainfall into early summer.

Is a tie rod leak in a basement the same thing as a car tie rod leak?

No. A car's tie rods are steering parts. Basement tie rods are the form ties left in a poured concrete foundation.

Stopping Tie Rod Leaks With A Better Choice, Inc.

A Better Choice, Inc. has helped homeowners in the Greater Pittsburgh area since 1996, with more than 26,000 customers served from its North Huntingdon base. The family- and veteran-owned company fixes wet basements across Westmoreland, Allegheny, Butler, and neighboring counties. A free inspection can show whether your wet tie holes are a simple seal or part of a bigger water problem.

Visit A Better Choice, Inc. or call 1-800-343-2357 today. Contact us for more information.