What is Polymeric Sand?

Polymeric sand is a blend of graded jointing sand and a binder. You sweep it into the joints between pavers, mist it with water in stages, and the binder activates and sets the sand firm. Done properly it locks pavers against each other, keeps weeds and ants out of the joints, and stops the sand washing out in heavy rain. Done wrong it hazes across the paver faces, never hardens, or cracks out within a season.

If you’ve ever looked closely at a well-built patio or walkway, you might notice that the joints between the pavers are filled with something that looks like sand-but it’s not quite the same as the loose sand you’d find at the beach. That material is often polymeric sand, and it plays a much bigger role than most people realize.

Polymeric sand is a specially formulated mixture of fine sand combined with additives-usually polymers-that act as binding agents. When the sand is swept into the joints between pavers and then activated with water, those polymers harden and lock the sand particles together. The result is a firm, stable joint that helps hold the entire surface in place.

One of the main reasons people use polymeric sand is durability. Traditional sand can wash away over time due to rain, wind, or regular foot traffic. Polymeric sand, on the other hand, resists erosion once it has set. This makes it especially useful in outdoor spaces like patios, driveways, and walkways where weather conditions can quickly break down untreated materials.

Another major advantage is weed and insect control. Loose sand leaves gaps where weeds can take root or insects can burrow. Because polymeric sand hardens after installation, it creates a barrier that discourages weed growth and reduces the likelihood of ants or other pests making a home between your pavers.

Installation is relatively straightforward but does require attention to detail. The sand is poured over the pavers and swept into the joints until they are completely filled. Any excess is brushed off the surface before lightly misting the area with water. The water activates the polymers, causing the sand to bind and cure over time. If too much water is used, it can wash away the binding agents; too little, and the sand won’t fully harden. Getting that balance right is key.

It’s also worth noting that polymeric sand isn’t completely maintenance-free. Over the years, exposure to weather and wear can cause some joints to weaken or crack, especially if the base beneath the pavers shifts. In those cases, small touch-ups or reapplications may be needed to keep everything looking and functioning properly.

In short, polymeric sand is more than just filler-it’s an essential component that helps extend the life and appearance of paved surfaces. By stabilizing joints, preventing weeds, and resisting erosion, it turns a simple paver installation into something that can hold up for years with minimal upkeep.

Polymeric sand is the new “grout” of outdoor hardscaping. Polymeric sand is made from sand, granite dust, silica and adhesives that are swept onto pavers and then “watered” to form a tight bond between pavers or in walls of rock. It can be used for patios, pool decks, driveways, retaining walls – everywhere a tight seal is needed. Most people prefer professional installation, but some DIYers with prep, paver, and masonry skills have created amazing spaces.

Polymeric sand in joints between pavers keeps patios and hardscapes free of pop-up weeds, ant hills and other breakthrough nuisances that mar the surface beauty of non-grassy, non-garden areas. Just like anything else, there are advantages and disadvantages to using polymeric sand in these areas.

Polymeric sand with its silica and adhesive additives is more expensive and more labor intensive than simply sweeping sand and granite dust into cracks and crevices. DIYers must follow directions for surface preparation, laying of pavers, sweeping in polymeric sand, adding the proper amount of water, and proper curing time. However, once all is installed according to manufacturer’s directions, the polymeric sand provides a secure bond between pavers, keeps weeds out and is resistant to rain, drought, and harsh weather. Plus, it looks beautiful year-round and comes in colors and formulas to coordinate with your stone and cement spaces. Local home and garden supply companies have a variety of hardscape pavers and the experts at polymericsandstore.com can help you with polymeric sand options whether you opt for a DIY application or prefer to have the pros design and build your outdoor place for summer socializing.

See how it stacks up against the rest of our polymeric sand range, and use the polymeric sand calculator to work out how many bags your joints will take.