Why do our patches keep failing at the edges?

Usually one of two reasons. Either the base under the patch had already failed, so the repair was carrying load it could not carry, or the edges were feathered rather than cut square, which leaves a thin margin that breaks up under traffic. A saw-cut edge seals; a feathered one is the first thing to go. Ask what edge treatment a bidder is proposing before comparing prices.

How do we tell base failure from surface damage?

By the pattern rather than the size. Interconnected cracking in the alligator pattern, an area that sinks, water standing after rain, and repeat failures in the same spot all point below the surface. Isolated cracks in an otherwise sound, well-draining surface are a surface problem. A bidder should be able to point at what they found and say why, and that reasoning should be in the written bid.

What stops a repair bid from growing once work starts?

A unit rate. Failed area is almost always larger than what is visible from the surface, so the useful protection is a stated rate per square metre for additional area found once the surface is off, agreed before the crew arrives. That converts a surprise into arithmetic. Without it, the extra work is negotiated on the spot, which is the worst possible moment.

Is it cheaper to do many small repairs or one larger program?

Per unit of area, a program almost always prices better, because mobilization is spread across more work rather than charged against a single small repair. Small isolated repairs still make sense when something is a safety issue or when a resurfacing program is already scheduled. Ask each bidder how many mobilizations the scope assumes and what an additional one costs.

Full-Depth Replacement vs Surface Patching on a Commercial Lot

Last updated: August 4, 2026By The Pavement Desk

The choice is not really about cost, it is about what failed. A surface patch on a sound base is the right, proportionate repair. The same patch over a soft or saturated base fails at its edges and comes back on the next work order. Ask the bidder what condition was found and on what evidence, then get the unit rate for whatever else turns up.

Once the approach is settled, AsphaltPavingIndex's own dataset lists 86 asphalt repair contractors across the Greater Toronto Area at an average Google rating of 4.73★ over 4,260 reviews (August 2026), so you can move straight from this page to a ranked shortlist for the bid list.

This page compares the two approaches on scope, evidence and disruption. Rates live in the linked cost guides, where every figure carries the named source it came from.

Full-depth replacement or Surface patching: what actually separates the two on a lot?

AsphaltPavingIndex built this side-by-side around the things that decide the choice on a working site: what each approach does, what it leaves untouched, and what the bid has to show before two prices can be compared at all.

Full-depth replacement vs Surface patching on a Greater Toronto Area commercial site, reviewed August 2026. Rates are on the linked cost guides, quoted before 13% HST.
Criterion	Full-depth replacement	Surface patching
Depth of the repair	Saw-cut through the surface and into the material beneath, then rebuilt in layers	Removes or covers the top only, leaving what is underneath in place
The failure it suits	Alligator cracking, sunken areas holding water, and spots that have already failed once	Isolated surface damage where the surrounding surface is sound and drains
What decides success	Whether the rebuilt base is compacted properly and drains	Whether the base was actually sound to begin with
Typical failure mode	Settlement at the joint if compaction was rushed	Cracking around the perimeter within a season or two, then a larger repair
Time out of service	Longer per area, since excavation, base and surface are separate operations	Short, often a single visit
Effect on the surrounding surface	The cut edge is a clean joint that seals	Feathered edges are the weak point and usually fail first
Suits a repeating maintenance budget?	No, it is a defined capital repair on identified areas	Yes, it is routine work carried through the operating budget
What the bid must show	Cut depth, granular depth and compaction, disposal, and the unit rate for extra area found	Repair method, area treated, edge treatment, and how the repair is closed off while it cools

Which surfaces call for a full-depth replacement?

Cut it out when the evidence says the problem is below the surface. Interconnected cracking, an area that sinks and holds water, or a patch that has already failed twice all mean the layer under the surface has stopped carrying load, and nothing applied on top of it will change that.

The cracking is interconnected in the alligator pattern rather than isolated.
The area sinks or ponds after rain, which points at the base or the drainage under it.
The same spot has been repaired before and failed again.

And which call for a surface patch?

Patch when the failure is isolated and the surface around it is sound. It is the proportionate repair, it takes one visit, and it keeps the lot serviceable between larger programs. The risk is only in using it where the base has already failed.

Damage is localised, with sound surface around it that still drains.
The lot is scheduled for resurfacing and the patch is holding the line until then.
The area is small enough that a mobilization for full-depth work is out of proportion.

How does the choice play out on a working site?

Two areas on the same lot, both roughly the same size, can call for different repairs. Here is how each is read:

Reading the site

Isolated crack, surface sound around it: Patch
Interconnected alligator cracking: Full depth
Area holds water after rain: Full depth plus drainage
Third failure in the same spot: Full depth
Line that protects the budget: Unit rate for extra failed area

Once the surface is off, the area that needs replacing is often larger than what was visible. A bid with a stated unit rate for that extra area turns a surprise into arithmetic. A bid without one turns it into a change order negotiated while a crew stands on your lot.

Frequently asked questions

Why do our patches keep failing at the edges?: Usually one of two reasons. Either the base under the patch had already failed, so the repair was carrying load it could not carry, or the edges were feathered rather than cut square, which leaves a thin margin that breaks up under traffic. A saw-cut edge seals; a feathered one is the first thing to go. Ask what edge treatment a bidder is proposing before comparing prices.
How do we tell base failure from surface damage?: By the pattern rather than the size. Interconnected cracking in the alligator pattern, an area that sinks, water standing after rain, and repeat failures in the same spot all point below the surface. Isolated cracks in an otherwise sound, well-draining surface are a surface problem. A bidder should be able to point at what they found and say why, and that reasoning should be in the written bid.
What stops a repair bid from growing once work starts?: A unit rate. Failed area is almost always larger than what is visible from the surface, so the useful protection is a stated rate per square metre for additional area found once the surface is off, agreed before the crew arrives. That converts a surprise into arithmetic. Without it, the extra work is negotiated on the spot, which is the worst possible moment.
Is it cheaper to do many small repairs or one larger program?: Per unit of area, a program almost always prices better, because mobilization is spread across more work rather than charged against a single small repair. Small isolated repairs still make sense when something is a safety issue or when a resurfacing program is already scheduled. Ask each bidder how many mobilizations the scope assumes and what an additional one costs.

Questions to ask your contractor

Are you proposing surface patching or saw-cut full-depth removal, and on what evidence? Repair rates by method
What is the unit rate per square metre for additional failed area found on site?
How many mobilizations does this scope assume, and what does an extra one cost?
How is each repair area kept closed and marked while it cools?
What do you warrant on the repair, and what voids it?