When sealing your pavers, you want to make sure they last a long time and look great. Many homeowners have heard about polymeric sand, a popular product used to fill the joints between pavers. While it might sound like a good idea, there are several reasons why it may not be the best option. Let’s explore why experts recommend a different approach and what issues polymeric sand can cause.
What the Experts Recommend
According to the Interlocking Concrete Pavement Institute (ICPI), the preferred materials for filling paver joints are sands that meet the standards of ASTM C33 or ASTM C144. These types of sand have been tested and proven to perform well when used with pavers. They are clean, properly sized, and help the pavers remain stable over time. Using the right kind of sand is key to maintaining the long-term beauty and durability of your pavers.
Problems with Polymeric Sand
Polymeric sand is a mixture of fine sand and special additives that harden when water is applied. While this hardening effect might seem useful, it comes with several downsides that can cause problems for homeowners:
Moisture Trapping and Mold Growth
Polymeric sand can trap moisture in the joints between pavers. When water gets stuck in these areas, it creates a perfect environment for mold and algae to grow. Over time, this can lead to dark, slimy spots on your pavers that are difficult to clean.
Breakdown Over Time
Although polymeric sand hardens when wet, it doesn’t stay that way forever. Over time, it starts to break down, leaving behind unsightly remnants of the product. The sand can erode and crumble, leaving the joints between your pavers looking uneven and messy, similar to how cracked grout looks in old tile work.
Uneven Appearance
As the polymeric sand breaks down, you may notice that the sand in some joints washes away while other areas remain full. This creates an inconsistent appearance across your pavers, making them look less attractive and well-maintained.
A Better Alternative: ASTM C33 or ASTM C144 Sand
Instead of polymeric sand, experts like ICPI recommend using ASTM C33 or ASTM C144 sand. These types of sand have several benefits:
Proper Drainage
Because these sands don’t harden like polymeric sand, water can easily drain through the joints. This reduces the chance of moisture getting trapped and helps prevent mold and algae growth.
Durability
ASTM C33 and C144 sands don’t break down over time like polymeric sand. They stay in place and continue to support the stability of your pavers for years to come.
Consistent Appearance
These sands provide a uniform look between your pavers, helping them maintain their original beauty without the risk of crumbling or uneven surfaces.
Conclusion
While polymeric sand may seem convenient for filling paver joints, its potential to trap moisture, break down over time, and create an uneven look makes it a less-than-ideal option. By choosing ASTM C33 or ASTM C144 sand, as recommended by the ICPI, you’ll protect your pavers from these common problems.
This ensures that your outdoor spaces stay clean, attractive, and easy to maintain for years to come. If you have questions about sealing your pavers, give us a call at Hoover Pressure Cleaning, 941-697-6886, we are happy to help you.