How Often Should You Re-Sand Block Paving?

Why the joints need sand at all

It's easy to think of jointing sand as a finishing touch, but it's doing structural work. It locks each block against its neighbours, spreading the weight of a car or a footstep across the whole surface rather than one block at a time. Without it, blocks can rock, shift and chip at the edges, and the surface starts to look uneven long before it's actually worn out.

It's also what gives block paving its crisp, finished look. Joints that are full read as deliberate and cared for. Joints that are low, patchy or full of moss and weeds are usually the first thing that makes a driveway look tired, even when the blocks themselves are in good condition.

Why sand disappears over time

A few things work against it. Rain washes the finer particles out a little at a time, especially on a slope or under a downpipe. Traffic and vibration from cars and foot traffic gradually settle it deeper into the joint. Weeds and, in some gardens, ants excavate it from below. And a thorough clean, whether pressure washing or a stiff brush, lifts some of it out along with the dirt.

None of that is a sign anything's gone wrong. It's normal wear, and it's exactly why re-sanding exists as a routine part of looking after block paving rather than a one-off repair.

Signs it's time to re-sand

Look down into the joints rather than just at the surface. If you can see a visible gap below the top of the blocks, if weeds keep coming back in the same spots, or if individual blocks feel slightly loose underfoot or wobble under a car tyre, the sand has likely dropped below where it needs to be. A driveway that's just been cleaned but still looks unfinished is usually telling you the same thing.

Kiln-dried sand or hard-setting sand?

Kiln-dried sand is the traditional choice: fine, completely dry sand brushed into the joints, where it beds in naturally over the following weeks. It's a proven finish and suits most block paving, though like any loose sand it will need topping up again in time.

Hard-setting sand is a firmer alternative that binds once it's watered in, giving a more stable joint that resists weeds and washout better than loose sand. It costs more upfront but tends to need attention less often. Some products also come in a choice of colours, for driveways where a closer match matters. We'll recommend the right one for your paving and the finish you're after when we quote.

How we re-sand block paving

The paving is cleaned and left fully dry first; sand won't bed into damp joints properly. Any weeds, moss or failing old sand are cleared out of the joints so we're filling clean, open gaps rather than sanding over the problem. Fresh sand is then brushed in, working it down into every joint across the whole surface, usually in more than one pass so nothing is left half-filled.

Once every joint is properly packed, the excess is brushed off the surface for a clean finish, and for hard-setting sand, water is applied to activate it. It's a methodical job done by hand, block by block, rather than a quick scatter over the top.

How often does it need doing?

There's no fixed interval, because it depends on the sand used, how sheltered the driveway is, and how much traffic it gets. Kiln-dried sand on a busy, exposed driveway may need topping up every few years; hard-setting sand in a similar spot will generally go longer between top-ups. It's worth checking the joints whenever your driveway is cleaned, since that's the natural point to see how they're holding up. Our guide on how often to clean a driveway or patio covers the cleaning side in more detail.

DIY or professional?

Buying a bag of sand and a stiff broom is easy enough. Getting it worked evenly into every joint across a full driveway, with nothing left shallow or missed, takes more time and patience than it looks. A professional job also means the paving is properly clean and dry first, the right sand is used for your paving, and the finish is even from edge to edge, not just wherever the broom happened to reach.