Why Does the Poly Sand Keep Coming Out of the Paver Joints?

This material is often used to fill the gaps between pavers, providing stability and preventing weeds from growing. However, in some cases, the poly sand tends to wash away or erode, leaving the joints exposed and vulnerable to damage. This can happen due to a combination of factors such as poor installation, improper drainage, and external factors like downspouts placed directly on top of the paver project. When water isn’t able to drain properly, it causes the polymeric sand to dislodge and escape from the joints. Over time, this erosion can become more severe, leading to the failure of the entire poly sand system. It’s crucial to address this issue to maintain the aesthetic appeal and functionality of the paver installation.

Why Did My Polymeric Sand Wash Out?

Polymeric sand is a popular choice for filling in paver joints due to it’s ability to lock the pavers together and prevent weed growth. However, one common issue that homeowners often face is the sand being washed out of the joints, leaving behind unsightly gaps. While this can be frustrating, understanding the reasons behind this problem can help prevent it from happening again.

The wide gaps allow an excessive amount of water flow during the activation process, causing the sand to be carried away. It’s important to follow the manufacturers guidelines when determining the appropriate joint width for polymeric sand installation.

Another factor that contributes to polymeric sand washout is improper installation. It’s crucial to carefully follow the installation instructions provided by the manufacturers to ensure a successful result.

Additionally, the type of pavers being used can affect the performance of the polymeric sand. In these cases, alternative jointing materials or techniques may be necessary to achieve desired results.

Excessive water flow can easily dislodge the sand from the joints, especially if they aren’t properly sealed or if there are underlying drainage issues. Ensuring proper drainage and maintaining the integrity of the jointing material can help mitigate this problem.

Inadequate joint width, improper installation, unsuitable paver types, and environmental factors all play a role in this issue. To prevent sand washout, it’s crucial to choose the appropriate jointing material, follow proper installation techniques, and consider the specifics of the project and environmental conditions.

Tips for Proper Installation of Polymeric Sand

Proper installation of polymeric sand is crucial for ensuring that it doesn’t come out of the paver joints. Here are some tips to help prevent this issue:

  • Start by thoroughly cleaning the paver surface to remove any debris, dirt, or weeds.
  • Ensure that the pavers are dry before applying the polymeric sand.
  • Carefully sweep the sand into the joints, making sure to fill them completely.
  • Gently compact the sand using a vibrating plate compactor or a rubber mallet.
  • Sweep off any excess sand from the paver surface to prevent it from hardening and staining the pavers.
  • Thoroughly water the area to activate the sand and allow it to harden.
  • Avoid applying the sand if rain is expected within the next 24 hours.
  • Regularly inspect the paver joints and refill any gaps that may appear over time.
  • Consider using a sealant to further protect the pavers and prevent sand erosion.

Following these installation tips will help ensure that the polymeric sand stays in place and provides a stable and durable joint for your pavers.

Sealing the paver surface not only enhances it’s beauty but also provides a protective barrier to keep the joint sand in place. The sealer acts as a glue, binding the sand particles together and preventing erosion caused by rainfall or high-pressure washing.

How Do You Keep Sand in Between Pavers?

One effective way to keep sand in between pavers is by sealing the paver surface. When sealed, the paver sealer acts as a glue, firmly holding the joint sand particles together. This prevents the sand from being washed out during rainstorms or when pressure washing the paver surface.

Paving materials such as asphalt, concrete, stones, artificial stone, bricks, and tiles are commonly used in landscape architecture. Pavement is an integral part of the hardscape and is used on sidewalks, roads, patios, courtyards, and other surfaces. When pavers are installed on these surfaces, joint sand is typically used to fill the gaps between them.

However, over time, the joint sand may start to come out of the paver joints. This can happen due to several reasons, such as erosion caused by heavy rainfall, frequent use of pressure washers, or natural wear and tear.

By applying a paver sealer, you can effectively solve this issue.

To keep the sand in between pavers for a longer period, it’s recommended to regularly inspect the paver surface for any signs of erosion or sand loss. If needed, reapply the paver sealer to maintain it’s protective properties.

Steps to Properly Seal Pavers to Prevent Sand Loss

  • Clean the pavers thoroughly with a pressure washer to remove any dirt or debris.
  • Allow the pavers to dry completely before sealing them.
  • Apply a high-quality paver sealer using a roller or sprayer, making sure to cover the entire surface evenly.
  • Use a brush or broom to spread the sealer into the joints between the pavers.
  • Allow the sealer to dry for the recommended time specified by the manufacturer.
  • Apply a second coat of sealer if necessary, following the same application process.
  • Avoid walking or placing any objects on the sealed pavers for at least 24 hours to allow the sealer to fully cure.
  • Regularly maintain the sealed pavers by cleaning them with a mild detergent and water.
  • Inspect the pavers periodically for any signs of wear or damage and reapply sealer as needed.

Source: How to Replace and Secure Joint Sand Between Pavers

Overfilling your joints with polymeric sand can cause several issues. Firstly, if the sand is filled right to the top of the pavers, there’s no room for expansion as the sand settles and compacts over time. This can cause the sand to crack or push against the edges of the pavers, leading to potential damage. Additionally, when you water the joints to activate the sand, overfilled joints are more likely to spill over, making a mess and potentially washing away the sand altogether. It’s important to strike a balance and leave a small space at the top of the pavers to allow for proper settling and avoid excessive sand overflow.

Can You Put Too Much Polymeric Sand in Joints?

Overfilled joints can cause a variety of problems. One issue is that the excess sand may be pushed out of the joints, resulting in a messy and uneven appearance. This can be particularly problematic in high traffic areas where the sand is more prone to being dislodged. Additionally, the excess sand can cause the pavers to become unstable, as it may shift and create uneven surfaces.

Another issue with overfilling joints is that it can impede the proper functioning of the polymeric sand. Polymeric sand is meant to provide stability and prevent weed growth by solidifying when exposed to moisture. If the joints are overfilled, the excess sand may not fully activate, meaning that it won’t properly harden and adhere to the pavers. This can lead to a weaker bond and a decreased ability to resist weed growth.

Furthermore, overfilled joints can make it difficult to properly compact the surface. When pavers are properly installed, they should be compacted to ensure that they’re tightly locked together. This helps to prevent shifting and ensures a long-lasting installation.

In addition to these practical considerations, overfilled joints can also have aesthetic implications. This can detract from the overall look of your outdoor space and reduce it’s curb appeal.

How to Properly Fill Joints With Polymeric Sand

Polymeric sand is commonly used to fill the joints between pavers because of it’s ability to create a strong bond and prevent weed growth. However, if the poly sand keeps coming out of the joints, it’s likely due to improper installation. To properly fill the joints with polymeric sand, start by removing any existing sand or debris. After wetting the paver surface, pour the polymeric sand evenly into the joints, ensuring they’re completely filled. Use a broom or brush to sweep the excess sand off the surface and into the joints. Next, use a compactor or tamper to firmly pack the sand into the joints, making sure it’s fully compacted. Finally, mist the surface with water to activate the sand’s binding properties. Repeat this process if necessary, to ensure all joints are properly filled and the poly sand stays in place.

Additionally, using a thin tool to scrape out the hardened polymeric sand from the joints can be effective, but be careful not to damage the surrounding surfaces.

How Do You Remove Old Polymeric Sand From Joints?

To remove old polymeric sand from joints, one effective method is using a thin tool to scrap out the hardened sand. This can be done by carefully inserting the tool into the joints and loosening the sand. However, this method may take considerable time and effort, especially if the sand has hardened significantly.

If your polymeric sand has hardened or somewhat hardened, a hot water pressure washer can also be utilized for removal. The hot water will re-activate the polymers in the sand, making it easier to remove. Using the pressure washer, you can spray hot water into the joints, allowing it to penetrate and soften the sand. As the sand loosens, it can be flushed out with the force of the water.

Before using the pressure washer, it’s important to test a small area to ensure it doesn’t damage the pavers or the surrounding area. Adjust the pressure settings accordingly to avoid any potential harm. Additionally, be cautious when using the pressure washer around fragile plants or delicate objects nearby.

These products are specifically designed to break down and dissolve the polymers in the sand, making it easier to remove. Follow the instructions provided by the manufacturer for proper application and safety precautions.

Whether using tools, a hot water pressure washer, or a sand dissolver product, it’s important to take necessary precautions and avoid causing damage to the pavers or surrounding areas.

When it comes to finding the right polymeric sand for thick joints, Techniseal’s HP2 Polymeric Jointing Sand is a top recommendation. This particular product is specifically designed for use with natural stones and can be used on joints as wide as 4 inches, as long as correct installation procedures are followed.

What Polymeric Sand for Thick Joints?

When it comes to paver joints, finding the right type of polymeric sand is crucial. Techniseal, a leading manufacturer in the industry, recommends it’s HP2 Polymeric Jointing Sand for natural stones. This specially formulated sand is designed to provide optimal stability and longevity for thicker joints.

One common issue that many people face is the sand continuously coming out of the paver joints. This can be extremely frustrating as it not only compromises the aesthetic appeal of the pavement but also undermines it’s structural integrity. However, with the right polymeric sand and proper installation techniques, this problem can be effectively addressed.

Techniseals HP2 Polymeric Jointing Sand is a reliable choice for joints as wide as 4 inches, as long as it’s installed correctly. The key to ensuring the sand stays in place is proper compaction and moisture control during installation. This involves using a vibrating plate compactor to firmly settle the sand into the joints and prevent any voids or gaps that could lead to sand loss.

In addition, it’s crucial to apply the polymeric sand when the pavement and joints are completely dry. Moisture, such as rain or dew, can hinder the curing process of the sand, resulting in weaker bonds and increased sand loss. By waiting for dry conditions, you can ensure that the sand forms a solid, cohesive bond that effectively locks the pavers in place.

Furthermore, following the manufacturers instructions regarding the depth of the sand application is vital. Applying an adequate amount of sand to fill the entire joint depth will enhance it’s stability and reduce the risk of sand loss. It’s recommended to slightly overfill the joints and then use a broom or brush to remove any excess sand before applying water.

Tips for Proper Installation of Polymeric Sand

Tips for proper installation of polymeric sand:

1. Start with clean, dry pavers: It’s important to ensure that the paver joints and surface are free from any dirt, debris, and moisture before applying polymeric sand. This will help the sand bond effectively.

2. Use the right type of sand: Make sure to choose the correct type of polymeric sand for your specific paver material. Different sands are designed for different applications, such as clay-based or concrete-based pavers.

3. Follow the manufacturer’s instructions: Read and follow the instructions provided by the manufacturer of the polymeric sand. They may have specific guidelines on the sand’s application, watering, and curing process.

4. Apply the sand evenly: Spread the polymeric sand evenly over the paver joints, making sure to fill all gaps completely. Use a broom or brush to push the sand into the joints and remove any excess sand from the paver surface.

5. Compact the sand: Use a plate compactor or a rubber mallet to gently compact the sand into the joints. This will help to ensure a strong bond and prevent the sand from being dislodged.

6. Wet and cure the sand: Once the sand is compacted, lightly mist the entire paved area with water. This will activate the polymers in the sand, allowing it to harden. Avoid over-watering, as excessive moisture can cause the sand to wash out.

By following these tips, you can ensure a proper installation of polymeric sand and prevent it from coming out of the paver joints.


In conclusion, the issue of poly sand coming out of the paver joints isn’t only a result of a poor installation, but can also be caused by external factors such as water drainage. The use of polymeric sand in paver joints is meant to create a solid and durable surface, but when water is unable to drain properly, it will inevitably cause erosion of the sand. This is why it’s important to consider factors such as downspout placement when installing pavers, as it can greatly affect the longevity and stability of the polymeric sand.

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