Repair methods
Routing and sealing concrete cracks
One quote is much more than the other for sealing the same cracks. Why?
Frequently because one of them is routing first and the other is not. Routing cuts the crack out into a clean, regular channel, giving the sealant sound concrete to bond to and a sensible shape to work in.
It costs more and it is usually the difference between a crack treatment that survives a few seasons and one that survives considerably longer. This is the single most useful line item to understand when comparing crack-repair estimates.
What the method is
A saw or router follows the crack, cutting a channel of consistent width and depth. The dust and loose material are removed, and sealant is placed into the prepared reservoir.
Two things improve. The bond faces are freshly cut sound concrete rather than weathered, dirty, irregular crack walls. And the sealant has a controlled shape, so it can stretch as intended rather than being a thin irregular smear.
The visible result is a neat, uniform line — wider than the original crack, but regular, which most homeowners find preferable to a ragged one.
What it does not do
- It does not restore strength across the crack or address settlement, voids, or the cause.
- It makes the treated line wider and more visible than the original crack, which some owners dislike.
- It does not prevent the crack from continuing to move; it makes the sealant better able to survive that movement.
- It generates dust and requires the surface to be dry and workable, so weather affects scheduling.
What you can safely check yourself
- Ask each estimate explicitly whether routing is included. That question alone often explains a price difference.
- Note whether appearance or durability matters more to you here, since routing trades a wider line for longer life.
- Note whether the crack is in a trafficked area, where preparation matters more.
Questions to ask whoever comes out
- Is routing included in this price, and what would it cost if it were?
- What width and depth are you cutting, and why that dimension?
- How are you removing the dust before sealing, and why does that matter?
- How much wider will the finished line be than the crack is now?
- What difference in service life do you expect between routing and not routing here?
Where estimates for this commonly differ in scope
These are the places two prices for apparently the same work stop being comparable.
- This is the most common hidden difference between crack-repair estimates and the one worth asking about first.
- Dust removal method is rarely specified and materially affects bond.
- Reservoir dimensions are almost never stated, though they govern how much movement the sealant can accommodate.
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
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
Is routing worth the extra cost?
Where the crack matters enough to treat at all, generally yes. Preparation is the variable that most affects how long a crack repair survives, because it determines what the sealant is bonded to. Paying less to seal a dirty irregular crack often means paying twice.
Will the routed line look worse than the crack?
It will be wider, and it will be regular. Most owners prefer a neat uniform line to a ragged one, but that is a genuine preference rather than a fact, and it is worth looking at an example before deciding.
Can routing be done on any crack?
It suits cracks in sound concrete where a clean channel can be cut. Where the concrete either side is deteriorating, routing exposes more weak material rather than sound faces, and the conversation moves towards repairing or replacing the area rather than treating the line.
Where to go next
Related problems
Worth comparing
What drives the cost
Methods that may apply
Want a straight answer about routing and sealing?
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.