Foundation Crack Repair in Sioux Falls, SD

Polyurethane Injection — The Right Fix for Most Sioux Falls Cracks

Polyurethane is a flexible expanding sealant that's injected into the crack under pressure. As it cures it expands by 5-10x, completely filling every void in the crack — including the parts you can't see. Once cured, it remains slightly flexible, so it tolerates the seasonal expansion and contraction Sioux Falls foundations go through every year.

• Sealing capability: 100% — water won't get through.
• Flexibility: Stays elastic, accommodates thermal movement.
• Best for: Active or intermittent water leaks, minor non-structural cracks.
• Time: Most cracks repaired in 60-90 minutes.

Epoxy Injection — Structural Rebonding

Epoxy is a rigid two-part resin that bonds the crack faces back together with strength greater than the original concrete. We use it when the crack is structural — typically narrow, dry, and we need to restore the wall's load-carrying capacity.

• Strength: Stronger than the surrounding concrete.
• Best for: Structural rebonding, dormant cracks, monolithic load-bearing repairs.
• Limitation: Rigid; won't tolerate ongoing movement (so we evaluate first).

How Foundation Crack Injection Works

1. We clean the crack and surrounding wall.
2. Injection ports are bonded along the length of the crack at 6-12 inch intervals.
3. The crack surface is sealed with a fast-set epoxy paste.
4. Polyurethane (or epoxy) is injected under pressure starting at the lowest port. As resin appears at the next port up, that port is capped and we move up the wall.
5. Resin cures within an hour.
6. Surface ports are removed and the wall is wiped clean.

The total visible footprint after the repair is typically a thin line of dried epoxy paste — most homeowners paint over it and forget it.

What Causes Foundation Cracks

• Concrete shrinkage as the foundation cures during the first year (very common, usually cosmetic).
• Hydrostatic pressure pushing on the wall after heavy rain or snowmelt.
• Soil settlement beneath one part of the footing.
• Frost heave from the freeze/thaw cycle.
• Differential pressure between sides of the home (one side shaded/wet, the other sunny/dry).

If the crack is wider than ¼ inch, runs horizontally, or shows signs of differential displacement (one side has moved relative to the other), it may indicate a deeper structural issue. In that case we'll recommend a full foundation repair evaluation rather than just an injection.

Crack Repair Cost in Sioux Falls

• Single vertical crack, polyurethane: typically $450-$750.
• Single crack, structural epoxy: typically $550-$900.
• Multiple cracks, package pricing: we discount when several are repaired in a single visit.

Free inspection, fixed quote on the spot, lifetime warranty against the same crack reopening.

Frequently Asked Questions