Amarillo Pavement Pros: Asphalt Overlay and Resurfacing in Amarillo, TX

When a lot is a resurfacing candidate and when it is not

The question that decides an overlay is not how bad the surface looks. It is whether water has got through to the base course yet.

Asphalt fails from the bottom up. The surface oxidises, it shrinks, it cracks, and for a while those cracks are cosmetic. Once they open enough to admit water, the water moves down through the mat into the crushed base and, in this part of Texas, into the caliche subgrade underneath. Saturated base loses its bearing strength. The mat above it starts to flex under wheel loads it used to carry without moving, and flexing asphalt cracks in the interlocking pattern the trade calls alligatoring. After that the material pumps out under traffic and you have a pothole.

A lot that is oxidised, cracked and rutted but still structurally supported is the ideal overlay candidate. A lot with potholes, pumping fines or full-depth alligator cracking is telling you the base is already gone there, and new asphalt over a failed base fails in the same footprint within a season.

Walking the lot before anything is quoted settles it. Cores on larger jobs, a visual and a straightedge on smaller ones.

What a mill and overlay actually involves

Milling grinds off a controlled depth of the existing surface, normally 1.5 to 2 inches, using a drum with carbide teeth. It does three useful things at once. It removes the most oxidised and most cracked material, it keeps the finished grade where it was, and it leaves a rough textured surface that the new mat keys into.

Grade matters more than people expect. Lay two inches of new asphalt over the old surface and the lot rises two inches. Curbs get two inches shorter, drainage inlets stay where they were, and an accessible route that ran flush develops a lip. Anywhere a grade change would cause one of those, the surface gets milled first.

After milling, the surface is swept clean, a tack coat is applied so the new lift bonds to the old, and the hot mix goes down and is compacted while it is still hot enough to achieve density. Density is the part that decides how long the job lasts. Under-compacted asphalt carries too many air voids, water gets into those voids, and the mat starts failing early no matter how good the material was.

Why Panhandle lots need this sooner than lots further south

Amarillo sits at 3,606 feet on the Llano Estacado, and the pavement here takes a specific combination of loads that a lot in Houston or San Antonio does not.

The dominant one is thermal cycling. NOAA engineering weather data records about 85 freeze-thaw cycles a year for Amarillo. Every one of those is water in a crack expanding as it freezes and contracting as it thaws, levering the crack a little wider. Eighty-five times a year is a great deal of work on a surface, and it is why a crack that would sit stable for years on the Gulf Coast opens up quickly here.

The second is ultraviolet exposure. At this elevation the sun strips the lighter fractions out of the binder faster than at sea level, which is the oxidation you see as a lot going grey. Brittle binder cracks under thermal cycling instead of flexing with it.

The third is the subgrade. Caliche makes a firm base dry and loses much of that wet, so keeping water out of the section is the whole job on this ground.

What the city requires when the surface is replaced

Off-street parking in Amarillo has to be surfaced with asphalt or concrete, connected to the street or alley by a similarly paved driveway, and marked to the parking design standards the city sets out in its Development Policy Manual. Resurfacing does not change any of that, but it does erase the existing markings, which means the layout gets re-established rather than simply re-traced.

That is also the moment accessible parking gets looked at properly. The Texas Accessibility Standards allow a maximum slope of 1:48, about two percent, in any direction across an accessible space and its access aisle. Lots settle over decades. A space that met that standard when the lot was built often does not by the time it needs resurfacing, and putting the paint back exactly where it was preserves a problem instead of fixing it.

There is a drainage angle too. Amarillo runs a drainage utility, and impervious surface is what that system is concerned with. Resurfacing that corrects ponding and moves water to the inlets is doing the job the drainage design intended.

Where this sits against the other options

Crack sealing buys time on a sound lot for a fraction of the cost. Sealcoating protects the binder from UV and adds no structural value at all. Reconstruction rebuilds base and surface together and is what you do when the base is finished.

An overlay is the middle move and it has the best economics when the timing is right. Miss the window and the same lot needs reconstruction at three to five times the cost.

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