Polymeric sand is a joint material made for paver joints that contains fine sand and binding additives that help the sand firm up after proper installation. Re-sanding is needed when joint material has been washed out, displaced, or deteriorated enough that the joints are no longer properly filled.

What is polymeric sand?

Regular joint sand is loose granular material placed between pavers. It fills the gaps and helps keep the individual pavers from shifting, but it remains loose and can be displaced by water, cleaning, or normal use.

Polymeric sand contains additives that bind the sand particles after the product is installed and activated correctly. This can help the joints resist movement, erosion, and weed growth better than loose sand.

Why does joint sand matter?

Joint sand is more than something that fills the visible gaps between pavers. Properly filled joints help lock adjacent pavers together and support the overall stability of the paved surface.

Regular sand: Simple to install and commonly used, but it can wash or blow out more easily.

Polymeric sand: Firms up after proper activation and can provide more resistance to erosion and weeds.

Missing sand: Leaves open joints where debris, water, and plant growth can collect.

The right material depends on the paver system, joint size, site conditions, and manufacturer's requirements.

How do you know when pavers need re-sanding?

Look closely at the joints rather than only at the paver surfaces. Re-sanding may be appropriate when joints are visibly low, empty, or uneven, especially after heavy rain or cleaning.

•Joint sand is missing or noticeably lower than surrounding joints.

•Water repeatedly washes sand out of the same areas.

•Weeds are appearing in open or poorly filled joints.

•Pavers show movement that may be related to deteriorated joints.

•Cleaning has removed a significant amount of joint material.

Re-sanding should not be used to hide a deeper drainage or base problem. If pavers are moving substantially or water is not draining properly, the underlying cause should be evaluated first.

How is polymeric sand installed correctly?

Polymeric sand needs proper preparation and installation. The existing joints generally need to be cleaned and cleared of unsuitable material before new sand is installed.

•Clean the paver surface and joints.

•Remove weeds, debris, and loose joint material.

•Install the appropriate sand into the joints.

•Compact or settle the sand according to the product requirements.

•Remove excess material from the paver surface.

•Activate the polymeric sand according to the manufacturer's instructions.

Product instructions matter because water requirements, joint conditions, weather, and activation methods can vary.

What happens if polymeric sand is installed incorrectly?

Improper installation can cause problems such as haze or residue left on the paver surface. Applying too much water can wash material from the joints, while insufficient activation may prevent the sand from bonding as intended.

Weather also matters. Heat, humidity, rain, and drying conditions can affect the installation process. In the Lowcountry, heavy rain and high humidity should be considered before scheduling this type of maintenance.

Should you use regular or polymeric sand?

Neither option is automatically right for every patio. Regular sand can be a practical choice in some applications and may be simpler to maintain, while polymeric sand can provide firmer joints when the product is compatible and installed correctly.

For older patios, the condition of the existing joints, pavers, drainage, and base should be checked before choosing replacement material. Properties around Wadmalaw Island and greater Charleston may also have sandy or clay soils and high water tables that affect how water moves around a patio.

Frequently asked questions

•How often should paver joints be re-sanded?

There is no universal schedule. Re-sanding depends on joint condition, rainfall, cleaning, drainage, traffic, and how well the original material remains in place.

•Can polymeric sand stop weeds completely?

No. Properly installed polymeric sand can make weed growth less likely, but windblown seeds, debris, and other conditions can still lead to growth.

•Can I add new sand over old sand?

Usually, the joints should be properly cleaned and prepared first. Simply adding a thin layer over deteriorated material may not provide a lasting result.

•Is re-sanding the same as sealing?

No. Re-sanding replaces or restores joint material. Sealing is a separate maintenance service that can protect the paver surface and provide other benefits depending on the sealer.

•Need help with paver maintenance?

Pave the Way Hardscape Design provides paid maintenance services including re-sanding, soft washing, and resealing. For a new project, our free design and build estimate includes an on-site visit, three price points for the same scope at different material levels, and a custom 3D design once booked.