When people talk about asphalt damage, winter usually comes up first. Michigan's cold seasons are tough on pavement, and the constant freeze-thaw cycle rightfully gets plenty of attention. Summer, though, causes its own serious damage. The problem is that summer damage happens gradually, often going unnoticed until cracks and deterioration become obvious.
If you own or manage a commercial property with an asphalt parking lot in Southfield, sealcoating during the summer months is one of the smartest moves an efficient asphalt paving company or local paving specialists can recommend. Understanding what summer does to asphalt and why a well-timed sealcoat matters can save you thousands in repairs down the road.
What Summer Actually Does to Asphalt
Asphalt is held together by a binder, a tar-like material that bonds the aggregate (crushed stone and sand) into a solid surface. That binder does not last forever. UV rays from the sun oxidize it over time, drying it out and making the asphalt brittle.
Once the binder starts to break down, the surface turns gray and begins to crack. Heat softens the top layer during the hottest months, and vehicle fluids dripping in a busy commercial lot speed up the deterioration further. A lot that looked acceptable at the start of summer can show noticeably more surface cracking by fall if the binder has been degrading for several seasons without protection.
Those surface cracks are what let water in when temperatures drop in October. The damage that starts in summer gets paid for over the following winter.
What Sealcoating Does and What It Does Not Do
Sealcoating is not a repair product. It will not fill a pothole, fix a structural crack, or rebuild a failed base. What it does is create a protective barrier over the surface of existing asphalt.
That barrier blocks UV rays from reaching the binder below, slowing oxidation significantly. It seals small surface voids so water has fewer entry points. It also repels vehicle fluids that would otherwise eat into unprotected asphalt over time.
The result is a surface that holds its color longer, sheds water more cleanly, and goes into each Michigan winter in better condition. For commercial lots in Southfield, sealcoating is the most cost-effective maintenance step available. We recommend it as a regular part of any pavement maintenance plan, not as a one-time treatment.
Why Summer Is the Right Window in Michigan
Sealcoating requires warm temperatures and dry conditions to bond and cure correctly. In Michigan, that window runs from late spring through early fall. Summer and early fall work particularly well for commercial properties because the sealer has time to fully cure before the ground freezes.
A lot sealcoated in August or September goes into winter with the freshest protection possible. That means water is less likely to work its way into the surface during the freeze-thaw cycles that begin in late October and run through March.
Scheduling sealcoating in summer also tends to work better for commercial operations. Off-hours or weekend scheduling is easier to arrange when the lot is not at peak use, and the 24 to 48-hour curing window is manageable for most businesses.
What the Sealcoating Process Involves
Before any sealer goes down, the surface has to be clean and properly prepared. Our crew sweeps and clears the lot of debris, treats any oil stains that could prevent the sealer from bonding, and fills surface cracks that are wide enough to let water through.
If the existing sealcoat has started to peel or bubble off the surface, we strip the old layer before applying a new coat. Putting fresh sealer over a degraded old coat leads to poor adhesion and early peeling. Stripping first is what makes the new coat hold through a full Michigan winter.
Once the surface is ready, the sealcoat is applied by squeegee or spray depending on the product and the surface condition. Most commercial lots receive two coats for complete, durable coverage. After application, the surface needs 24 to 48 hours to cure before vehicles should drive on it.
How Often a Commercial Lot Should Be Sealcoated
The standard recommendation for commercial properties is every 3 to 5 years. High-traffic lots with significant sun exposure may need attention closer to every 3 years. Lower-traffic or more shaded lots can often go 4 to 5 years between applications.
The signs that a lot is due are not subtle. The surface shifts from black to gray or brown. Small cracks start appearing across the lot. Water no longer beads on the surface after rain. Any of those signs means the existing protection has worn through and the asphalt underneath is exposed.
Our team provides free on-site assessments for commercial lots throughout Southfield and Metro Detroit.
What Skipping Sealcoating Costs Over Time
Skipping a sealcoat cycle does not cause immediate failure. But it means the binder keeps oxidizing, small cracks keep growing, and water gets into the surface before the next winter. Skip two or three cycles and the surface has often deteriorated to the point where sealcoating alone is no longer enough.
Crack repairs get added to the scope. Pothole patching gets added too. In some cases, sections have failed enough that they need to be removed and repaved before any sealer can even go down.
The math is not complicated. A timely sealcoat costs a fraction of what section repairs cost after deferred maintenance. For commercial property managers working with fixed maintenance budgets, staying on the sealcoating schedule is consistently the lower-cost path over time.
Related Topics:
- What Should Commercial Property Managers Know About Asphalt Paving in Southfield MI?
- What Are the Signs a Commercial Parking Lot Needs Asphalt Repair in Southfield MI?