Parking Lot Sealcoating in Des Moines, IA

Parking lot sealcoating applies two coats of sealer, with a third on entrances and drive lanes, over a cleaned and crack-filled lot, and in Des Moines it also has to hold up to a winter rule that keeps every plowed pile on the property. The city bars placing snow from parking lots on the street or public right-of-way, and a first violation carries an administrative penalty. That makes each lot a storage yard for its own snow, and every pile eventually melts across the pavement around it. A lot with open cracks and gray, porous asphalt takes that meltwater into its base. A filled and sealed lot sheds it toward the drains, which is the whole point of the job.

Planning starts with where the snow will go. Normal snowfall at the airport station is 35.3 inches, and on a commercial lot every inch of it is either stored on site or hauled away. A pile at the high end of the lot sends meltwater across every stall below it, and that sheet refreezes overnight; a pile near an inlet, a curb cut to a swale or a grass island drains away quickly. Mapping the snow storage area before sealing tells a contractor where extra crack sealing and a third coat will pay off, and where a low spot needs patching first.

Commercial work is done in sections so the property can stay open. A common plan seals half the lot, sends traffic to the other half, and swaps the next day, because SealMaster calls for 24 hours of cure after the final coat before traffic returns. Two coats are standard, and SealMaster recommends a third on entrances, exits and drive lanes, where tires turn and brake. The right window depends on the property: a church lot may be easiest midweek, an office lot over a weekend. Weather rules match driveway work, 50 degrees and rising with a dry day to follow, which puts most lot work between mid-May and September.

Product choice carries more weight on a lot than on one driveway. The US Geological Survey found PAH levels in house dust 25 times higher in apartments whose lots were sealed with coal-tar products than in apartments next to other surfaces, and it measures coal-tar sealcoat at roughly 1,000 times the PAH content of asphalt-based sealer. No Iowa city, county or state rule appears on the national ban tally, so the choice falls to the owner. Naming an asphalt-emulsion or acrylic product in the specification settles it before bids arrive.

SealMaster puts commercial sealcoating at 10 to 30 cents a square foot, and FixAsphalt's published ranges run $0.20 to $0.50 for sealing alone, $0.60 to $0.80 with crack sealing, and $0.65 to $0.90 with crack sealing and new lines. By size, FixAsphalt lists $1,200 to $2,100 for a 10-to-15-car lot and $3,000 to $6,000 for 30 to 50 cars. Sealer covers the old stripes, so line striping belongs in the same bid, and the cost page shows how these figures compare with driveway work.