Repair methods
Concrete crack filling
Can the crack just be filled so it looks right again?
Yes, if the crack has stopped moving. Filling places a rigid material into the crack to restore a continuous surface that can be walked on, driven on and finished to blend with the surroundings.
The condition attached to that — stability — is the whole story. Rigid material in a moving crack has nowhere to go, so it cracks through or debonds, and you have paid for a repair that reproduces the original line.
What the method is
The crack is cleaned and often opened slightly to give the filler a sound edge to bond to, then filled with a rigid cementitious or resin-based material and finished flush.
Because the material is rigid, it can carry traffic and wear like the surrounding concrete, which is what makes it appropriate where a sealant would be worn away or would stay visible as a soft line.
Appearance is better than sealing but rarely invisible. Colour and texture matching to weathered concrete is approximate.
What it does not do
- It does not accommodate movement. In a crack that opens and closes seasonally, expect it to fail.
- It does not restore structural continuity in any engineered sense, even though it produces a continuous surface.
- It does not address settlement, voids, or the cause of the crack.
- It does not guarantee an invisible result.
What you can safely check yourself
- Establish stability before choosing this. Two dated measurements of the crack, ideally a season apart, are what justify a rigid material.
- Note whether traffic runs across the crack, which favours a rigid wearable filler over a sealant.
- Note whether appearance matters here, since that is much of the reason to choose filling.
When professional evaluation matters more
- The crack has moved between dated observations, which points away from rigid filling
- There is vertical displacement across the crack
- The crack is carrying water, which raises whether sealing is the better goal
Questions to ask whoever comes out
- How have you established that this crack is stable enough for a rigid filler?
- What material, and how does it handle any seasonal movement?
- How close will the colour and texture match, honestly?
- Are you opening the crack out first, and why or why not?
- If it reopens within a year, what does your warranty cover?
Where estimates for this commonly differ in scope
These are the places two prices for apparently the same work stop being comparable.
- Whether the crack is being routed or filled as found materially affects both price and durability, and is frequently unstated.
- Colour matching is often implied and rarely promised. Ask explicitly.
- Filling and resurfacing the surrounding area are sometimes bundled, which hides which part of the price buys which outcome.
Usually worth planning a repair
Conditions in this band do not usually become emergencies, but they rarely improve on their own and repair costs tend to rise with the affected area.
Who tends to do this work
- A concrete repair specialist
- A residential flatwork concrete contractor
ConcreteOwner does not inspect, certify or approve contractors. This describes which trade usually holds this work, not a recommendation of anybody in particular.
Common questions
Will a filled crack be invisible?
Rarely. A good filling repair is much less obvious than a sealed crack, but matching the colour and texture of weathered concrete is approximate. If appearance is the main goal, ask to see previous work rather than relying on a description.
Why did my filled crack come back?
The most common explanation is that the crack was still moving. A rigid filler cannot accommodate movement, so it either cracks through the middle or lets go at one edge — reproducing the original line. That is why establishing stability first matters more than the choice of product.
Is filling better than sealing?
Neither is better; they suit different cracks. Filling gives you a hard, wearable, better-looking surface on a crack that has stopped moving. Sealing gives you water exclusion on a crack that is still moving. Choosing on price rather than on crack behaviour is how the wrong one gets bought.
Where to go next
Related problems
Worth comparing
What drives the cost
Methods that may apply
Before you sign anything
Want a straight answer about crack filling?
Both decision tools are free and need no contact details. If you would rather have somebody local look at it, you can ask us to review whether we can match you — and we will say plainly if we cannot.