Michigan is one of the toughest environments in the country for asphalt pavement. Our unique combination of harsh winters, dramatic temperature swings, heavy road salt use, and intense summer sun creates a year-round assault on driveways and parking lots. Understanding exactly how each weather factor damages your asphalt helps you take the right protective steps at the right time.
The freeze-thaw cycle is the number one enemy of asphalt in Michigan. When water seeps into cracks and pores in the pavement surface, it expands by approximately 9 percent when it freezes. That expansion physically widens cracks and pushes apart the asphalt around it. When it thaws, the water seeps deeper into the newly widened gap. The next freeze pushes it apart even further. Michigan experiences dozens of freeze-thaw cycles every winter — each one doing a little more damage. This is the primary mechanism that turns hairline cracks into potholes in a single season.
Road salt is the second major threat. Southeastern Michigan applies millions of tons of road salt every winter, and much of it ends up on your driveway brought in by your vehicles. Salt is hygroscopic — it absorbs moisture from the air — which means it keeps the surface of your asphalt wet longer than it would be otherwise. That prolonged moisture exposure accelerates deterioration. Salt also chemically interacts with the asphalt binder, drying it out and making it more brittle. Sealcoating creates a barrier between the salt and the asphalt itself.
UV radiation from the sun is a year-round problem, but it peaks during Michigan's warm months. Ultraviolet light breaks down the hydrocarbon chains in the asphalt binder through a process called oxidation. You can see this happening: fresh asphalt is dark black, but over time it fades to gray. That color change represents the binder drying out and becoming brittle. Oxidized asphalt cracks more easily under stress. Sealcoating blocks UV from reaching the binder, dramatically slowing the oxidation process.
Heavy rain and snowmelt present water infiltration risks beyond the freeze-thaw issue. When water penetrates past the asphalt surface and reaches the gravel base underneath, it can erode and weaken that base material. Once the base is compromised, the asphalt above it has nothing solid to rest on. This is how you get areas that sink, rut, or develop widespread alligator cracking — the surface is fine, but the foundation underneath has washed out. Properly sealed surfaces shed water instead of absorbing it.
Temperature extremes add another dimension. Michigan can see temperature swings of 40 to 50 degrees within a 24-hour period during transitional seasons. Asphalt expands in heat and contracts in cold. These rapid, dramatic changes create thermal stress that can fracture even healthy pavement. The rubberized crack fillers we use at PrideShield are specifically designed to flex with these temperature changes instead of cracking again.
So what can you do? The strategy is straightforward and proven. Fill cracks as soon as they appear — do not let them go through even one winter cycle. Sealcoat every 2 to 3 years to maintain the protective barrier against UV, salt, and water. Address drainage issues so water moves off your pavement instead of sitting on it. And do not ignore the signs of wear — by the time your driveway looks obviously damaged, the underlying deterioration is usually well ahead of what you can see on the surface.
PrideShield Sealcoating specializes in protecting Michigan asphalt from Michigan weather. We understand the specific challenges our climate presents because we live here too. Contact us for a free assessment of your driveway or parking lot and we will build a maintenance plan that keeps your pavement protected through every season.