By Steven Brahney | March 21, 2024


Uncover the origins of the unattractive white marks that mar asphalt parking lots, delve into their causes, and learn why simply covering them up can lead to future complications.

Common Misconceptions About White Stains In Asphalt Parking Lots In New Jersey


If you've ever wondered about those mysterious white stains in the cracks in your asphalt parking lot, you're not alone.

While many attribute them to salt residue from winter de-icing efforts, the truth behind these unsightly marks may surprise you.

In fact, if these stains persist long after winter has passed, it's likely that they are caused by calcium and sodium bicarbonate rising to the surface due to hydrostatic pressure beneath the asphalt.

This phenomenon is particularly common in areas with clay-based soils that struggle to absorb water properly, indicating a potential underlying water issue that needs to be addressed promptly. So, next time you spot those white stains, remember that they may signify something more than a temporary winter inconvenience.

If they are remaining after winter they are an indication that you have underground water under your asphalt parking lot.



Asphalt Paving Considerations In New Jersey With White Stains On Your Parking Lot

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Can you pave over underground water?

The short answer is- Yes- you can pave over any surface on which you can lay asphalt that is load-bearing.

However, it's not advisable to do so!

Underground water will quickly resurface through the new asphalt as early as seven days after installation.  On average, it begins to resurface within 30 days.  

Underground water is always best addressed prior to milling and paving or resurfacing your parking lot in New Jersey.

Keep in mind that underground water is a slip & fall liability all year long.  It creates ice in the winter and moss in the summer. 


How Do You Diagnose If You Have Underground Water In Your Asphalt Parking Lot?

A knowledgeable asphalt paving specialist will conduct thorough inspections of your parking lot during various weather conditions, including rainy and dry periods, to determine the presence of underground water beneath your parking lot.

They will utilize a sub-surface evaluation to accurately assess the subsurface conditions and identify any areas prone to water accumulation. In addition, coring services can be provided as well to analyze for underground water.  By analyzing the data collected from these inspections, the specialist can create a comprehensive plan to address any underlying water issues before they cause further damage to the asphalt surface.

Furthermore, they will also consider factors such as soil composition, drainage patterns, and nearby water sources to gain a holistic understanding of the potential water infiltration risks. This meticulous approach ensures that the paving project is carried out with precision and foresight, ultimately leading to a durable and long-lasting parking lot free from the unsightly white stains caused by underground water.

How Is Underground Water Remediated Prior To Asphalt Parking Lot Paving In New Jersey?


An underdrain / drain tile / french drain is installed into the parking lot prior to milling and paving.  To learn more about this service please visit: VIDEO OF PROCESS


Before embarking on a milling and paving project for your asphalt parking lot in New Jersey, it is essential to thoroughly inspect the surface for any signs of white staining, cracks, or areas where underground water may be surfacing. By addressing these issues proactively before starting the paving project, you can ensure a seamless and successful outcome. Taking the time to identify and remediate any potential water infiltration risks will not only enhance the longevity and durability of your parking lot but also prevent the unsightly white stains that can mar its appearance. Remember, proper preparation is key to achieving a high-quality asphalt surface that will stand the test of time.

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