If you use regular sand, you may have to re-sand pavers every two years. But, other indicators may mean that the time has come.
With regular sand, you should re-sand your pavers at least once in two years. Polymeric sand is usually good for about ten years, so re-sanding costs are saved when using this type of sand.
Brick pavers absolutely, 100% need to be re-sanded prior to sealing. The sand in the brick paver joints serves MANY integral purposes.
Joint stabilization – If you don't have Sand in the joints, rainwater or pool water will run between the brick paver joints and wash out the base aggregate sand material your brick pavers float on (usually a 1″ – 2″ sand base), making your brick pavers lose, shaky, uneven, sunken in or even raised in some areas.
Polymeric sand is the most popular and useful filler used under brick pavers. It is a mixture of fine sand, adhesive and is most widely used in paver joints. Typically, polymeric sand lasts for up to 10 years. But if you use high-quality polymeric sand, it can last for approximately 15 years.
Polymeric Sand has many benefits, however, the biggest drawback is that it can be easy to mess up, especially if you don't follow the manufacturer's instructions. Avoid the common mistakes by following the manufacturer's instructions and educating yourself on the best process to use.
No, new product won't adhere to the old. You have to remove the old polymeric sand and then apply fresh product for the best result. How to replace polymeric sand between pavers? Inspect the pavers to make sure the sand in the crevices is at least 1/8″ below the top of the pavers.
When looking for alternatives to polymeric sand, you will also want to find high quality materials. There are other products, such as EnviroSAND, EnviroSTONE and EnviroPATH on the market that are able to stop water erosion from occurring.
Regular sand for paving is prone to erosion, damage from weeds and can make your pavers hard to wash without risking the loss of any jointing sand between the stones. Using polymeric sand, however, prevents weeds from taking root and holds pavers firmly in place thanks to the durability of its seal.
You can choose to fill the cracks between pavers with a polymer sand. This filler, once wet with a hose, turns hard, almost like mortar. It will make it tougher for weeds to take root. Or, plan to seal the patio once it's complete.
Pavers should be resealed every 3 to 4 years on average. You will know when your pavers need to be resealed because water will stop beading on the surface and the sheen will diminish. In addition, you may notice weeds starting to grow in between joints and the pavers may start to lose their color.
Pressure washing can remove set-in stains and grime from the pavers, but it may also wash away some of the sand. While it washes away quite a bit of general purpose sand, it can only remove ½ to ¾ inches of stabilizing sand.
Can you power wash pavers? Power washing (also known as pressure washing) is also a very effective method by which you can remove dust deposits and various stains from your pavers. Just make sure that the water jet is not directed directly at the joints between the paving stones.
Pro Tip: It's very important that you lay no more than 1” of bedding sand. Any more will promote settling or wobbling—two things you don't want pavers to do. Once your sand is in place, you'll use a 10'–12' strike board to “screed” the sand.
The most effective way to water the sand is to adjust the nozzle to “shower” and water the pavers until no more water will soak in. Spray for a few seconds, then stop and observe. If the joints continue to take water, keep spraying.
Estimating the Paver Sand
The final paver sand depth needs to be 1 inch and you need to account for sand filtering into the paver base and into the joints between the pavers. Make your calculations using a sand depth of 2 inches or 0.1667 feet.
Polymeric sand is appreciated by paver installers because joints you get from it are durable and even . This eliminates any risk of weed growth and ant infestation that could affect the overall aesthetics and durability of paver projects.
The Problem With Polymeric Sands & Water Mitigation
Most polymeric sands don't drain water which meant small stones were used to fill the joints between the interlock. For driveways, this solution isn't a big issue but near a pool or patio, people prefer the smooth uniformity of polymeric sand.
Polymeric Sand is great for stabilizing your pavers because it bonds so well. This becomes a problem though, if it is activated and then allowed to dry ON TOP OF instead of between pavers.
Polymeric sand is the more reliable and durable option for filling in the paver gaps. It outperforms regular sand when a homeowner is looking to lock the paver joints properly and wants a steady and stable path. It also provides a better appearance with its cleaner look and availability in varied colors.
Polymeric sand relies on a chemical reaction to harden it into the joints between your paving stones. Once it hardens, it is permanent.
If remov- ing polymeric sand, a hot water pressure washer will help to soften up the binders in the sand. Any tough to remove hardened areas, may require mechanical means to clean the joint. Take caution with natural stone or thin style pavers and be sure to avoid disturb- ance of the bedding sand underneath.
A minimum of 24 hours drying time is required prior to allowing foot traffic and 48 hours for vehicular traffic on the paver surface. Dampening: Apply a gentle fine mist to the filled joints, flooding the faces of the pavers and allowing the water to run into the joints. Do not flood the sand onto paver surfaces.
If your polymeric sand didn't harden up, it's pretty much guaranteed there's a moisture issue. If the joints remain wet after the installation, they will remain soft until they dry. So getting one initial complete drying "set" is very important to the long-term performance and lifespan of the product.