Asphalt needs warm, dry weather to cure properly. In Davenport, the paving season runs from April through October, with the best results in late spring and early fall.
Asphalt is installed hot and needs time to cool and compact properly. For good results, air temperatures should be consistently above 50 degrees Fahrenheit, and ideally above 60 degrees. The ground temperature matters too. If the ground is cold or frozen, the asphalt cools too quickly and does not compact well, which leads to a weaker surface that will crack and fail sooner.
In Davenport, average high temperatures climb above 60 degrees in April and stay there through October. January averages a high of 30 degrees and a low of 13 degrees, with frequent freeze-thaw cycles and snow likely from November through February. That makes winter a bad time to pave. Even if you get a warm day in December or January, the ground is still cold and the asphalt will not bond and compact the way it should.
Most asphalt contractors in Eastern Iowa work from April through October. April and May can be tricky because spring rains are heavy and the ground may still be saturated from snowmelt. If the base is too wet, equipment can sink in and you cannot get proper compaction. June, July, and August are the busiest months, and contractors are usually booked up. September and early October are often the best time to get work done. The weather is still warm enough, the ground is dry, and contractors have more availability.
Sealcoating also needs warm, dry conditions. You want at least 50 degrees and no rain in the forecast for 24 hours after application. Late spring and early fall are ideal for sealcoating because the pavement is fully cured from the previous season and the temperatures are moderate. Avoid sealcoating in the heat of summer when the sealer can dry too fast, or in late fall when frost is a risk.
Davenport gets about 36 inches of precipitation per year, spread fairly evenly across the months but with heavier rain in spring and summer. Thunderstorms can drop several inches of rain in a short time, which is why good drainage is so important. If water pools on your driveway, it will work its way into cracks and do damage when it freezes.
We also see dozens of freeze-thaw cycles every winter. Temperatures regularly swing above and below 32 degrees from November through March, and each cycle does a little more damage to pavement that has cracks or weak spots. This is why maintenance matters. Filling cracks in the fall before winter arrives can save you from much bigger repairs in the spring.
Davenport sits right on the Mississippi River, and flooding is a recurring issue. The Great Flood of 1993 crested at 22.63 feet on July 9, and the 2019 flood reached 22.7 feet, breaking the 1993 record. In 2019, a temporary barrier failed and floodwaters rushed into downtown. While most residential properties are not in the direct flood zone, heavy rains can cause localized flooding and drainage problems that affect driveways and parking areas.
If your driveway is damaged by a storm or flood, wait for the water to recede and the ground to dry out before doing repairs. Paving over wet or unstable ground is a waste of money. A contractor can assess the damage and tell you whether you need to replace the base or if the damage is just surface level.
If you are thinking about paving or sealcoating, contact a contractor in late winter or early spring to get on the schedule. Good contractors book up fast once the season starts. Getting a quote and lining up the work in March or April means you can get the job done in May or June when conditions are good, rather than waiting until August when everyone is backed up.
For sealcoating, plan to do it every 2 to 3 years as part of regular maintenance. If you paved a new driveway, wait at least 6 months to a year before sealcoating to let the asphalt cure fully. And always check the weather forecast. Even in summer, a surprise rainstorm the day after sealcoating can ruin the job.
Also in our network: Best Time to Pave or Sealcoat Asphalt in Cedar Rapids.
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