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The three conditions we check in Mesa before we say yes to an overlay
Not every driveway is an overlay candidate. Before we agree to pave over an existing surface we check three conditions on the walk-through. If all three pass, an overlay is on the table. If any one of them fails, we tell you why and quote the tear-out instead. This is the honest short version of the assessment; the long version is what the walk-through is for.
Condition one — the base has to be sound
The base is what carries the load. If the base has failed — you see sinking, whole-panel alligator cracking, or water ponding a day after a monsoon — then no overlay will save it. The failed base will keep moving and the fresh mat on top will mirror the failure inside a couple of years. In Mesa the usual base-failure causes are downspout water tracking under the mat, undercompacted sub-base from the original build, or an old irrigation leak.
Condition two — the cracking has to be surface, not structural
Hairlines, single-line thermal cracks and small edge cracks are surface aging — the top layer degrading in the Mesa sun. Those can be routed, filled and overlaid without concern. Chicken-wire (alligator) cracking, cracks with the edges pushed apart or lifted, and cracks that have spread into a network across whole panels are structural — the base is talking to you through the surface. Those need cut-out and rebuild, not overlay.
Condition three — enough clearance to add 1.5" to 2" without breaking anything
An overlay adds height. Usually 1.5" for a driveway and 2" for a lot. That is fine when the driveway starts well below the garage-door threshold, well below the sidewalk, and well below the gutter tie-in. It is not fine when adding 1.5" would put water back over the garage-door threshold, force us to grind the sidewalk edge, or reverse the drainage into the yard. We measure on the walk-through and tell you whether the elevation math works.
What the overlay actually looks like on the day
When the three conditions pass, the overlay day runs like this: mill the edges back a few feet at the garage door, the sidewalk and the street cut so the new mat can tie in flush; deep-clean the surface; rout and fill any wider cracks; tack the whole surface with emulsion; lay 1.5" to 2" of fresh hot mix at temperature; roll for density; hand-work the joints. Walkable in a few hours; drivable in a day or two in Mesa heat.
What we say when the overlay is not the right answer
If any condition fails, we say so. Sometimes the honest answer is a targeted cut-and-patch on the failed section plus overlay on the rest. Sometimes it is a full tear-out because the base is just done. We will not sell you an overlay that we know will fail. If a tear-out is the right answer, see the driveway paving page. If a partial repair is the right answer, see the asphalt repair page.
A note on old concrete driveways
Paving asphalt over a concrete driveway is possible but the conditions are stricter — the concrete has to be sound, the cracks have to be routed and filled, and the tie-ins have to be milled. Asphalt-over-concrete tends to crack along the underlying concrete joints ("reflective cracking") within a few years, and honest disclosure of that is part of the quote if you go ahead.