What Is Block Paving Re-Sanding and Why Does It Matter?
Re-sanding replaces the jointing sand that holds block paving together. Here is what it involves and why it is an essential part of a proper clean.
If you have block paving, re-sanding is an essential part of a proper clean. The fine sand in the joints between blocks is not just cosmetic: it holds the whole surface together. When cleaning washes that sand out, replacing it keeps your driveway stable, level and weed-resistant.
This guide explains what block paving re-sanding is, why it matters so much for the strength and longevity of your driveway and why it is always done as the final stage of a professional clean.
What re-sanding is
Re-sanding means brushing fresh kiln-dried sand into the joints between paving blocks after cleaning. Kiln-dried sand is very fine and completely dry, so it flows easily into the narrow joints rather than clumping. Once swept in and settled, it fills the gaps and locks the blocks firmly against each other.
Why the sand matters so much
The jointing sand does far more than fill a gap. It is structural.
| What the sand does | Why it matters |
|---|---|
| Locks blocks together | Forces the blocks against each other for a strong, stable surface. |
| Prevents movement | Stops blocks shifting, sinking or rocking under vehicle weight. |
| Resists weeds | Full joints leave no gap for wind-blown seeds to germinate in. |
| Aids drainage | Allows water to drain while keeping the structure intact. |
Cleaning, especially pressure washing, always removes some jointing sand, so replacing it is a necessary part of the job rather than an optional extra.
How re-sanding is done
Done properly, re-sanding follows a clear sequence on a dry surface.
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Step 1
Let it dry
The joints must be completely dry, as damp sand clumps and will not fill the gaps.
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Step 2
Spread the sand
Fresh kiln-dried sand is spread across the surface.
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Step 3
Brush in
The sand is brushed diagonally across the blocks to work it deep into every joint.
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Step 4
Settle and top up
The surface is settled, often with a plate compactor, then joints are topped up as needed.
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Why it comes after cleaning
Cleaning removes dirt, moss and the old, contaminated sand from the joints, so re-sanding has to follow it. Skipping this step leaves the blocks loose and the joints open to weeds. It is the natural final stage of the clean, which we describe in our guide on what to expect during a professional clean.
Re-sanding, sealing and weeds
For the longest-lasting result, re-sanding is often followed by sealing, which locks the new sand in place and adds protection. Our guide on what driveway sealing involves and why it is done covers this. Full, well-sanded joints are also the best defence against weeds, as we explain in how weeds are removed during cleaning.
For block paving cleaned and re-sanded properly, the team behind our London driveway cleaning service is happy to help.
This article is part of our wider resource centre. For more practical advice, browse our London driveway cleaning guides.
Frequently asked questions
What is block paving re-sanding?
Brushing fresh kiln-dried sand into the joints between paving blocks after cleaning, replacing the sand that washing removes and locking the blocks together.
Why does block paving need re-sanding?
The jointing sand holds the blocks firmly against each other. Cleaning washes it out, so replacing it keeps the surface stable, level and weed-resistant.
What sand is used?
Kiln-dried sand, which is very fine and completely dry. Its dry particles flow easily into the narrow joints rather than clumping on the surface.
Why is it done after cleaning?
Cleaning removes the old, contaminated sand along with dirt and moss, so fresh sand has to be brushed in afterwards on a dry surface.
Do I need to seal after re-sanding?
Sealing is optional but recommended, as it locks the new sand in place and adds protection. It is usually done on the same dry day as re-sanding.
This page gives general guidance on block paving re-sanding in London. The amount of sand and whether sealing follows depend on your paving and its condition.
Get your block paving done properly
Get a fast, no-obligation quote for professional driveway cleaning across London. We will clean and re-sand your block paving properly and agree a clear fixed price before any work begins.