Basement Crack Repair in Omaha

Which cracks are usually minor and which deserve a closer look

Cracks in basement walls and floors are common in Omaha homes. Most fall into one of two general categories.

Cracks that are often cosmetic or low-risk:

• Thin hairline cracks in poured concrete walls, especially vertical ones, that are dry and have not changed in size. These often form as concrete cures and shrinks.
• Small shrinkage cracks in a floor slab that are not letting in water.
• Cracks that have been stable for years with no moisture, movement, or widening.

Cracks worth a professional look:

• Horizontal cracks in a block or poured wall. These can indicate lateral soil pressure and are among the more serious types.
• Stair-step cracks in a block wall, which often follow the mortar joints and can signal differential settling.
• Cracks that are wider than a credit card, or that are wider at one end than the other.
• Any crack that is actively leaking water, or that shows staining, efflorescence (white mineral deposits), or rust streaks around it.
• Cracks that have visibly grown since you first noticed them. Photographing a crack with a coin for scale and checking it a few weeks later is a simple way to track this.

When in doubt, have someone look. Foundation crack repair is generally less involved and less expensive when caught early.

Why cracks form in Omaha foundations

The soil and the weather explain most of it.

Omaha sits on loess, a fine wind-blown silt, with clay-rich subsoils beneath. The city's own engineers have noted that loess can be easily carried away by water, leaving gaps underground. When soil shifts or washes away under or around a foundation, the structure above it moves, and movement causes cracks.

Seasonal pressure adds to this. Omaha averages about 135 days a year with overnight lows at or below freezing. Frost pushes into the ground and can press against foundation walls from the outside. Omaha also averages about 31.86 inches of precipitation a year, with May the wettest month. Saturated subsoils push harder against basement walls. Over years and decades, this back-and-forth takes a toll.

Older homes carry more of this history. Many Omaha neighborhoods were built decades ago, and foundations that have been through many freeze-thaw and wet-dry cycles are more likely to show it.

One more thing worth knowing: Douglas County radon tests have averaged 4.8 pCi/L and Sarpy County 5.3 pCi/L, both above the EPA action level of 4.0. Both counties, along with Pottawattamie County in Iowa, are EPA Radon Zone 1. Cracks in a basement floor or wall can be an entry point for radon gas. If you have not tested for radon, it is worth doing as a separate step. Nebraska requires radon testers and mitigators to be state licensed.

What repair usually involves

A contractor will look at the crack before recommending an approach. Options depend on whether the issue is cosmetic, a water entry point, or something structural.

Options a contractor may suggest:

• Epoxy or polyurethane injection to fill and seal a crack in a poured concrete wall. Epoxy bonds the crack and can restore some structural integrity. Polyurethane foam expands to seal against water. Which one a contractor uses depends on whether the crack is dry or wet and what the goal is.
• Surface patching for minor cosmetic cracks that are not structural and not leaking.
• Carbon fiber straps, wall anchors, or other reinforcement if the crack is part of a larger wall movement problem. In that case, sealing the crack alone is not enough.
• Exterior excavation and waterproofing if the crack is being driven by water pressure from outside.

A contractor doing foundation crack repair should explain what caused the crack, not just how they plan to fill it.

What affects the cost

Cost depends on the type and length of the crack, whether it is leaking, whether the repair is cosmetic or structural, how accessible the wall is, and whether the crack is a symptom of a larger problem that also needs addressing. A crack that requires wall reinforcement will cost more than a straightforward injection. There is no honest way to give a number without someone looking at the specific crack.

How to choose a contractor

Nebraska requires contractors to register with the Nebraska Department of Labor. Search the registry at dol.nebraska.gov. Also check the BBB of the Midwest Plains, based in Omaha.

When you talk to a contractor, ask:

• What caused this crack, and is it still moving?
• Are you recommending injection, reinforcement, or something else, and why?
• Does sealing the crack also address the water, or do I need additional waterproofing?
• What does the written warranty cover?

Get everything in writing before any work begins.

Frequently asked questions