Asphalt Paving Blog

Learn About The Effects of Spring Rain on Asphalt Parking Lots

water on asphaltApril showers might bring more than May flowers if you (and your asphalt) aren't prepared.

There’s a reason why experienced asphalt paving professionals recommend preventative asphalt maintenance. If you’ve taken the necessary steps to protect your pavement, a little April rain shouldn't cause any problems. However, if you haven’t completed general maintenance, small cracks, depressions and potholes could cause some serious Spring damage.

Problem: Water Weakens The Bond Between Asphalt Binder And Aggregates

If your pavement has cracks, it becomes vulnerable to the elements, specifically water. Given enough time, water can slowly erode your unprotected asphalt, accessing and weakening the supportive and structural layers of your pavement.

Wisconsin is known for having drastic weather fluctuations, which is not good if you have excess water in your parking lot. Standing water, which is often prevalent in the springtime, goes through the freeze/thaw cycle continually, which shrinks and expands water molecules. This process causes stripping, the process of debonding the aggregate and binder. When the bond between the aggregate and the binder deteriorates it weakens the pavement, making it more vulnerable to future damage. If the water gets under the sub-base it can even compromise the structural integrity of the pavement.

If left untreated, your small crack will only grow bigger and start to cause more damage. Before you know it your parking lot will be filled with alligator cracks, leaving you with an unsafe and unappealing pavement.

Spring Rain On Asphalt Parking Lots

Solutions: Sealcoating, Surface Drainage & Pavement Maintenance


You can protect your asphalt from water penetration with sealcoating. The sealcoating process adds a thin liquid layer over a paved surface to protect it from damage cause by UV rays, rain, snow and fluids from vehicles. Sealcoating is a great way to prevent cracks from forming in the first place and extends the life of your pavement.

It is typically recommended that you get a sealcoating application once every 3-5 years to protect your investment.


Planning for proper water drainage is a very important step during the asphalt installation process. When constructing parking lots and driveways, contractors must plan on making the most out of grassy areas and inlets where water can be directed using slopes and asphalt curbing, which you can learn more about in this blog. To read more about where grading and sloping falls into the asphalt pavement installation process, click here!

Porous pavement allows water from rain or snow melt to drain through the pavement surface into a stone recharge bed, and filter back into the soil and groundwater below. Not only is it a great way to manage water drainage, it’s also a great way for your business to receive potential tax cuts.

SPRING CHECKLISTPavement Maintenance

Standing water and rainfall can’t exploit weaknesses in your pavement if there aren’t any. Small cracks are easier and more inexpensive to manage and repair than large cracks so it’s best to get them taken care of right away. If you would like more information on identifying potential problems download our free Spring Maintenance Checklist for repair tips and other helpful information.

Keep and eye on your pavement and watch out for the following:

Cracks and potholes are obvious fixes, but why should you be looking out for pooling water?

Puddles may be a result of surface depressions, formed by a section of your pavement settling lower than the rest of the pavement. This could mean that a section of your pavement has sub-base troubles. For more information on this topic, read more in our blog What Is Causing Puddles To Form In My Parking Lot?

If you’re interested in talking more about asphalt solutions please contact us or feel free to reach out to our Oconomowoc office at 262-965-2121 or our Sun Prairie office at 608-249-7931.

Would you like to learn more about asphalt maintenance and protection?
Check our our free downloadable brochures.


Spring Preparation checklist

Topics: Asphalt Solutions