A block paving driveway is one of the lowest-maintenance surfaces you can have — but “low maintenance” isn’t “no maintenance,” and in Scotland’s damp, freeze-thaw climate the few jobs that matter, matter a lot. Done right, a handful of small habits keep a driveway looking close to new for decades. Ignored, the same driveway looks tired in five years.
Here’s exactly what to do, when to do it, and the mistakes that quietly wreck good paving.
The one thing most people get wrong
Before anything else: the jointing sand between your blocks is structural, not cosmetic. Those kiln-dried sand-filled joints are what lock the blocks together and let the surface flex as a unit. When the sand washes out — and pressure washers are the number one culprit — the blocks lose their interlock, water gets into the laying course, and you’re on the road to rocking, sinking blocks.
So the golden rule of block paving maintenance is: clean it, but protect the joints, and top the sand back up. Everything below follows from that.
Routine cleaning (the easy 90%)
Most of the time, keeping block paving looking good is genuinely simple:
- Sweep regularly. Brushing off leaves, soil and debris stops organic matter rotting down into joints and feeding moss. This is the single highest-value, lowest-effort habit.
- Pull the odd weed early. A weed in a joint is easy now and a nuisance in three months.
- Rinse with a hose and a stiff brush for general grime. A bucket of warm water with a little washing-up liquid or a dedicated patio cleaner handles most marks.
- Tackle spills quickly. Oil, fuel and the like are far easier to lift before they soak in.
That’s the routine for most of the year. The bigger jobs are seasonal.
Dealing with moss and algae (the Scottish special)
If you live in Glasgow, you know damp. Shaded, north-facing or tree-sheltered driveways grow a green film of algae and cushions of moss because they stay wet. It’s the most common complaint we hear, and it’s very manageable:
- Improve the conditions first. Cut back overhanging branches to let light and air in. Moss hates a dry, sunny joint.
- Brush off the bulk of dry moss with a stiff broom.
- Apply a proper treatment — a patio/block-paving fungicidal cleaner, or a dedicated moss and algae killer. Follow the dwell time on the label.
- Rinse and re-brush a few days later once it’s killed off.
- Repeat in autumn and spring if your driveway is heavily shaded. Prevention beats scrubbing.
A note on bleach and salt home-remedies: they can discolour blocks and harm nearby planting. A purpose-made block paving cleaner is safer and works better.
Pressure washing: do it carefully or not at all
A pressure washer can transform a grubby driveway — but it’s also the fastest way to ruin one. If you’re going to use one:
- Keep the nozzle moving and hold it at a shallow angle, never blasting straight down into a joint.
- Keep your distance — start far back and only move closer if needed.
- Never use a turbo/rotary tip up close on the joints.
- Work in sections, and expect to lose sand — you almost always will.
- Always re-sand afterwards (next section). This step is not optional.
Honestly? For routine cleaning, a stiff brush and a cleaning solution are kinder to the driveway than a pressure washer. Save the washer for an occasional deep clean, and always re-sand when you’re done.
Quick CTA: If pressure washing has exposed dips, rocking blocks or a sunken patch, that’s a sub-base issue, not a cleaning one. Get a free assessment before it spreads.
Re-sanding the joints (the job everyone skips)
This is the maintenance task that actually preserves the driveway, and it’s the one most people have never heard of. Over the years — and instantly after a pressure wash — kiln-dried jointing sand gradually escapes the joints. Topping it back up restores the interlock.
How to re-sand:
- Make sure the surface and joints are completely dry — sand won’t flow into damp joints.
- Pour kiln-dried jointing sand (the fine, dry stuff — not building sand) across the driveway.
- Sweep it diagonally across the blocks so it works down into every joint.
- Vibrate or tamp it down if you can, then sweep more sand in until the joints are full to just below the chamfer.
- Brush the surface clean of excess before rain.
Do this every couple of years, and immediately after any deep clean. It’s an afternoon’s work that adds years of life.
To seal or not to seal?
Sealing divides opinion, so here’s the honest version. A block paving sealer can:
- Pros — stabilise the jointing sand, make stains easier to lift, slightly deepen the colour, and slow moss regrowth.
- Cons — it’s an ongoing commitment (re-seal every 3–5 years), it must go onto a clean, bone-dry, freshly re-sanded driveway, and a poor application can leave a patchy or plasticky finish.
Our take: sealing is optional, not essential. A well-built driveway doesn’t need it. If you like the slightly richer look and the easier stain cleanup and you’ll keep up with re-coating, it’s worthwhile — especially on pale blocks. If you’d rather forget about it, regular sweeping and re-sanding will keep block paving healthy on their own.
What about efflorescence?
If your new-ish driveway develops a patchy white “bloom,” don’t panic — that’s efflorescence, natural lime salts working their way out of concrete blocks. It is not a fault and not dirt you’ve failed to clean. It typically fades on its own within the first year or two as rain washes it through. A dedicated efflorescence remover speeds it up if it bothers you, but patience is free.
A simple year-round schedule
| When | Job |
|---|---|
| Year-round | Sweep debris, pull stray weeds, wipe spills promptly |
| Spring | Moss/algae treatment, general wash, check joints |
| Summer | Optional deep clean; re-sand; seal if you choose to |
| Autumn | Clear leaves often, second moss treatment if shaded |
| Winter | Use grit/sand for ice, go easy on rock salt; clear snow with a plastic shovel, not a metal blade |
A quick winter note: heavy rock-salt use can, over time, contribute to surface scaling on concrete blocks. A light hand with salt, or using grit, is kinder to the paving.
When cleaning isn’t the answer
Sometimes a “dirty” or “failing” driveway isn’t a maintenance problem at all — it’s a build problem surfacing. Tell-tale signs that no amount of cleaning will fix:
- Blocks that rock underfoot or under a tyre
- Dips and low spots where water pools after rain
- Blocks creeping outward at the edges (failed or missing edge restraints)
- Continuous weed growth along joints that keep emptying of sand because the surface holds water
These point to the laying course or sub-base, and the fix is repair or partial re-lay rather than a bottle of cleaner. We cover the underlying causes in why driveways sink and how to spot a bad sub-base — and if you’re already seeing it, our driveway repairs service deals with sunken blocks, drainage faults and re-laying done properly.
The honest take
Block paving rewards a little attention with decades of good looks. Sweep often, treat moss before it takes hold, pressure wash sparingly, re-sand the joints, and seal only if you fancy it. Do that and Glasgow’s weather won’t get the better of your driveway.
And if maintenance has uncovered something structural — rocking blocks, a sunken patch, water that won’t drain — book a free assessment and we’ll tell you honestly whether it’s a repair or a re-lay. If you’re weighing up a brand-new driveway instead, here’s what’s included in our block paving installations.