From there it is sprayed with water, causing the polymers to harden. This is what secures the sand in place and holds the joints together. Because polymeric sand is so durable, you can power wash it without having to worry about it being dislodged. Polymeric sand can withstand extreme weather conditions and is highly resistant to erosion.
Aside from holding the paver joints, polymeric sand also prevents water from seeping through it. This significantly reduces the risk of cracking and shifting from your pavers. As detailed above, the best paver base is a quarry processed crushed stone subbase and a washed concrete sand base.
For best results, use a dense grade stone aggregate and concrete sand that complies with American Society for Testing and Materials standards. Talk to your supplier to make sure your materials align with these standards.
To calculate the amount of sand or crushed stone you should purchase, the Interlocking Concrete Pavement Institute recommends the following guidelines for every square-foot area:. These machines look like small, simplified push mowers and are typically manually operated. Their engines vibrate a base plate, which can be used to compress your subbase particles closer together.
Vibrating plate compactors come in a variety of sizes, so be sure to rent a machine that makes sense for the size of your paver project.
For maximum effectiveness, complete your compaction one thin layer at a time. Slightly wetting your crushed stone subbase may aid the compaction process. It is standard to use a four-inch crushed stone subbase over granular soil and a six-inch subbase over clay soil. These thicknesses work well for everyday pedestrian traffic.
If your pavers are located around a pool or will receive vehicle traffic, your subbase should be six to eight inches thick. Extra thickness beyond six to eight inches may help reinforce pavers that will support extremely heavy vehicles like semi-trailers or campers. To protect your pavers from unevenness, double your subbase thickness in areas that might freeze during the winter.
The extra distance between the subgrade soil and the actual pavers will help mitigate any movement due to the ground freezing and thawing. As you lay your concrete sand base, aim to make it less than 1.
There are many types of tools to help level the sand base. Whatever you decide, the end goal is to have a completely smooth surface for your pavers. Leaving your base out overnight increases the chances that wind, debris or people will disturb the flat surface. Leaving pavers out overnight can increase their moisture content, which may make them susceptible to efflorescence after installation. Efflorescence is the presence of salt deposits on your pavers, which gives them a white or greyish tint.
To avoid efflorescence and keep your base level intact, begin adding pavers directly after screeding. However you lay the foundation for your project, Nitterhouse Masonry has durable pavers to match.
As a family-owned and operated business for five generations, we understand longevity. You can trust that our pavers will provide years of aesthetic appeal and convenience after installation. The correct sand for laying a base under concrete pavers is concrete sand. Concrete sand is extremely course so it can be compacted uniformly and allows for adequate water drainage.
This type of sand will also lift slightly into the joints between the pavers when they are being leveled, helping to lock the pavers in place.
Concrete sand also locks together tightly enough in paver joints to help stop water from seeping under the pavers and lifting them. There are two different types of sand used when building paver patios. The first is called by many names: all-purpose, leveling, or paver sand. These are all the same sand and are spread over the leveled ground on top of the landscape fabric, but beneath the PaverBase and pavers.
This sand can also be used as the second type of sand, joint sand, which fills the gaps between the paving stones if they have spacer bars or gaps. Flat-sided paving stones do not need joint sand.
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