Yes, you can apply a second layer of polymeric sand. This may be necessary if the first layer has been disturbed by wind or rain. Polymeric sand is a great way to fill the gaps between pavers to prevent weed growth and to help keep the pavers in place.
The second layer should be applied in the same manner as the first layer. Start by adding the polymeric sand to the joints, then use a mechanical tamper to compact it in place. If the sand does not reach the top of the joint, you should scoop some out and add it to the joint until it is slightly mounded above the surface of the pavers.
After compacting the sand and verifying that the joints are filled, use a garden hose to lightly spray the sand so that it binds together and sets properly. This process should be performed on a dry day and the sand should not be saturated and should not cause any puddles.
Allow the newly applied polymeric sand to remain undisturbed for at least 24 hours and you will then have a strong and durable second layer in place.
How do you touch up polymeric sand?
If you want to touch up the polymeric sand in your pavers or patio, the first step is to get rid of any dust or debris that has been blown into the spaces between the pavers. Then, make sure to wet down the previously applied polymeric sand.
This will help make the paver sand soft and make it easier to scrape out and replace any damaged areas.
Once you have wet down the polymeric sand, use a trowel to scratch out and remove any existing polymeric sand that is damaged or dislodged. Take a few moments to carefully clear out any pieces that have been compacted below the sand surface.
Once you have removed the old polymeric sand, you can use a vacuum to get rid of any additional debris that may be lodged in the spaces between the pavers.
Next, fill the gaps between the pavers with new polymeric sand. Start by scooping a handful of polymeric sand in the affected area, then use the trowel to guide the sand into the spaces between the pavers.
Make sure to spread the sand evenly to fill all the gaps. When the new polymeric sand is in place, thoroughly mist the top of the pavers with water. The water will activate the bonding agent in the polymeric sand, allowing it to form a strong interlock between the pavers and prevent any future weeds.
Once completed, you can use a nylon brush to spread out the sand layer and redistribute any trapped air pockets. You may need to mist the pavers multiple times to make sure the bonding agent is properly activated and the sand settles in place.
If any areas are still looking dry, spray them again with water and let the polymeric sand set for 24 hours before use.
Do I need to remove old polymeric sand?
Yes, it is necessary to remove old polymeric sand before installing new polymeric sand. Over time, polymeric sand loses its binding qualities and becomes very susceptible to weeds and other pests. Removing the old polymeric sand and replacing it with a new product will help to keep your patio or walkway free of weeds and other pests.
It is also important to make sure that you are thorough when removing the old polymeric sand to ensure that all of it is taken out as any remaining polymeric sand could be detrimental to the installation of the new product.
How often does polymeric sand need to be replaced?
Polymeric sand typically needs to be replaced once every 4-7 years, depending on the specific type of application and the environment in which it is used. When used in a patio or walkway joint, polymeric sand should generally be replaced every 4-5 years to help keep the area looking neat and to guard against any potential erosion, weeds, and ants.
In more humid climates where there is risk of increased rain or other factors, it is best to replace the polymeric sand every 6-7 years. Additionally, as with any joint-filling material, polymeric sand must be inspected regularly for signs of deterioration and replaced when necessary.
Can I pressure wash polymeric sand?
Yes, you can pressure wash polymeric sand. However, it is important to take precautions when doing so, as pressure washing can cause the sand to become displaced or cause water to seep into seams or joints of the surrounding hardscape.
To prevent this, it is recommended to keep the pressure at a low level, preferably below 1500 psi, and use a wide nozzle spray. Additionally, it is important to keep the distance of the spray from the sand surface at least 10 inches.
Additionally, once the sand surface is cleaned, it is important to let the area dry before walking or using the space in any way.
How long does it take for polymeric sand to harden?
The amount of time it takes for polymeric sand to harden varies depending on the type of product used, environmental conditions and application technique. Most polymeric sand products are designed to harden within 24 hours after activation by water.
However, if temperatures are cooler or if too much water is added to the sand, it may take up to 72 hours for the sand to harden and cure completely. If a Freeze/Thaw cycle is present, longer cure times may be necessary.
To ensure optimal hardening, it is best to follow manufacturer recommendations for their product and the application process.
How can I use polymeric sand without a compactor?
You can use polymeric sand without a compactor by pre-wetting the surface of the pavers and the polymeric sand, honing the sand into the small joints between the stones and sprinkling a mist of water over the surface of the pavers and the sand.
The mist of water should be fine enough to not move the sand granules. It is important to ensure that the surface is completely saturated. Once fully dampened, use a broom or a push broom to press the polymeric sand further into the joints.
If the sand has instability or if there are any gaps, use a trowel to fill them in. Finally, use a sponge or a dry cloth to carefully dry brush the surface of the pavers to remove any excess sand.
Does water go through polymeric sand?
No, polymeric sand is designed to fill the gaps between pavers such as concrete and brick, creating a loose barrier that resists the movement of water. Polymeric sand is an aggregate material made up of fine particles of sand and particles of polymers, which create a more secure bond when applied between the pavers.
The polymers in polymeric sand prevent water from easily passing through the joints, providing a more stable base for walkways and driveways that are regularly exposed to moisture. This helps control the growth of weeds, insects and other pests that love to inhabit wet soil.
Ultimately, polymeric sand helps reduce erosion by keeping sediment and other materials out of the joints, allowing the pavers to stay strong and secure.
Does polymeric sand harden like concrete?
No, polymeric sand does not harden like concrete. Polymeric sand is specially designed for filling the joints between pavers, such as concrete, brick, and natural stone. The sand is not intended to be a structural material that will harden like concrete.
The sand is formulated with a co-polymer that binds the individual particles together when it is activated with water. This binding agent holds the sand particles together and can help prevent weeds from growing through the joints and improve the stability of the paved area.
However, this binding ability is much weaker than the hardening ability of concrete, so the sand will never become as hard as concrete.
Can polymeric sand ruin pavers?
Yes, polymeric sand can ruin pavers due to a variety of factors. Poor installation techniques, too much water, and high temperatures can cause the sand to become too hard, resulting in the pavers cracking or shifting.
Additionally, if your installation area has existing weeds, their roots can grow in the sand and cause shifting or obstruction of pavers. Other environmental elements, such as rain, wind, or freezing temperatures, can also cause the sand to erode or dry out, resulting in gaps between pavers.
In order to avoid damaging your pavers, it is important to ensure that the polymeric sand is applied correctly and that all weeds are removed prior to installation. Additionally, you should also ensure that any efflorescence is removed from the pavers and that the sand is regularly swept away to stop it from clumping.
