Driveway Sealing in Lansing, MI

Driveway sealing puts a thin emulsion coat over residential asphalt to slow the two processes that wear it out: sunlight oxidizing the binder, and water entering the surface and freezing there. Around Lansing the second process sets the pace. The airport station's normals show about 80 days a year when a driveway freezes and thaws within the same day, most of them from November through April, and each one works on any water held in the pores or in open cracks. A sound coat closes those pores and keeps meltwater running off instead of soaking in. It does not repair anything, so the work begins with patching and crack filling, and the coat goes down only on a clean, dry surface during weather warm enough for it to cure.

What seal coating actually changes is the surface. New asphalt is black because the binder coating each stone is fresh. Over a few summers ultraviolet light oxidizes that binder, the surface turns gray, fine aggregate starts to loosen, and the pavement becomes more porous. SealMaster describes sealcoat's job as preventing oxidation of the asphalt binder and weather damage. On a drive that is still structurally sound, that is enough to slow the slide from gray and porous to cracked and broken, which is the slide the local freeze-thaw count speeds up.

The curing weather here is the constraint. SealMaster's FAQ sets the floor at 50 degrees or warmer, climbing, and held for 24 hours, with no rain forecast in that time. At the Capital Region airport station the normal overnight low is 46.7 degrees in May, 56.7 in June, 60.6 in July, 59.4 in August and 51.2 in September, then drops to 40.7 in October. The dependable sealing days therefore run from late May through mid-September. Shoulder-season jobs are possible on warm stretches, but a coat applied on a cool October afternoon and chilled overnight may stay soft and track.

Many drives in the city serve old houses: the 2019-2023 Census survey puts Lansing's median year built at 1959. When a drive has been overlaid, the joints and cracks of the older pavement tend to come up through the newer layer as reflection cracks, which Pavement Interactive describes as cracks sitting directly over the ones underneath. Those need filling before sealing, and a crew should say when a drive has so many of them that an overlay or replacement is the more sensible spend.

Product choice has a local rule attached. Michigan has no statewide coal-tar ban, but East Lansing is listed as limiting sealer PAH content to 0.1 percent, and the U.S. Geological Survey finds coal-tar sealcoat carries on the order of a thousand times more PAHs than asphalt-based sealers. Asphalt emulsion is the common alternative, and Angi's material costs, 8 to 10 cents a square foot, make it one of the cheaper options too. Owners outside East Lansing can still ask for the product name on the quote and check its label.