Granite doesn’t come up as often as sandstone round Liverpool. But when it does, it’s usually a driveway that’s had setts laid rather than big paving slabs. It’s a different beast to clean, and it behaves completely differently. So I wanted to put down what I’ve learned dealing with it.
What Is Granite
Setts vs Slabs
Why Granite Barely Stains
Where It Actually Gets Dirty
How I Clean It
Sealing: Is It Needed
FAQs
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What Is Granite
Granite’s an igneous rock, formed from cooled magma. That makes it about as hard and dense as paving stone gets. You’ll usually see it as small rectangular setts, sometimes called cobbles, in grey or silver-grey, occasionally darker charcoal shades. That density is exactly what makes it such a different clean to everything else on my round.
Setts vs Slabs
Most granite driveways I see are laid as setts, small blocks a bit like traditional cobblestones, rather than large flat slabs. That changes how I approach the clean, because you’ve got loads more joint lines than a slabbed driveway. More joints means more places for moss and weeds to get a foothold, even though the granite itself resists staining brilliantly.
Why Granite Barely Stains
Granite’s about as low-porosity as natural stone gets. Water sits on the surface rather than soaking in. That means algae and moss struggle to get established on the stone itself. I’ve cleaned granite driveways that were five, six years old and still looked genuinely decent underneath the surface dirt, no green creeping into the stone the way you’d see on sandstone by that age.
Where It Actually Gets Dirty
The stone itself stays clean, but the joints are where all the action happens. Moss and weeds love the gaps between granite setts, especially if they weren’t jointed properly when laid. General grime, tyre marks, and everyday dirt also build up on the surface over time. It’s just surface-level rather than soaked into the stone.
How I Clean It
Because granite’s so hard, I can go in with confidence on pressure without worrying about damaging the surface. That isn’t something I’d say about every stone I deal with. Pressure wash to lift the general grime, then twin-jet surface cleaner for an even finish across the setts. Where moss has got into the joints, the turbo nozzle clears that out properly, blasting through the roots rather than just knocking the top growth off.
If it’s badly overgrown in the joints, I might need to go over it twice. Once to clear the bulk of it, and again once it’s dried a bit to catch what’s left. Worth knowing that upfront rather than being surprised on the day. It’s a similar story to porcelain paving in that respect, both are dense enough to take a proper clean without much risk.
Sealing: Is It Needed
Honestly, not really, and I wouldn’t take your money for it if you asked. Granite’s naturally so resistant to water and staining that a sealer doesn’t add much. If I’m ever asked about sealing a granite driveway, I’d tell people to save it. The stone’s already doing the job sealer would do on something like sandstone.
FAQs
No, not really. It’s naturally low-porosity and resists staining well without it. I wouldn’t recommend spending money on it.
It’s almost always the joints between the setts, rather than the stone itself. Once moss or weeds get established there, they need proper treatment, not just a surface sweep.
Less often than sandstone. Every 18 months to 2 years is typical, since the stone itself resists staining so well.
Very unlikely. It’s one of the hardest stones I deal with, so there’s much less risk compared to softer stone like sandstone.
That can just be general weathering and light surface grime, rather than staining soaked into the stone. A clean usually brings the shine straight back.
They can if the base or jointing wasn’t done properly when laid. That’s a laying issue rather than something cleaning affects, worth mentioning to whoever installed it if you notice movement.
Setts have far more joint lines, which means more spots for moss and weeds to take hold. Slabs are more straightforward, closer to cleaning any other flat paving stone.
Rarely on the stone itself. If you see green, it’s almost always in the joints rather than on the granite surface.
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