Article
Porcelain has become one of the most requested patio materials we lay. Walk into any paving supplier and you’ll hear it described as almost perfect: hard-wearing, low maintenance, and not slippery.
Mostly, that’s fair. But nearly every porcelain patio problem we’re called out to fix comes from the same place. Not the slabs. The way they were laid.
So here’s the balanced version: what porcelain does well, where it falls short, and what to check before anyone lays a single tile in your garden.
What is porcelain paving?
Outdoor porcelain is a dense, kiln-fired ceramic slab, usually around 20mm thick for patios. That’s roughly double the thickness of an indoor floor tile. Because it’s manufactured, colours and sizes are consistent, and it can be printed to look like sandstone, slate, limestone or even timber.
The pros and cons at a glance
| Pros | Cons |
| Very consistent colour and size, so a crisp modern finish | Less forgiving to lay; needs specific primers and skills |
| Resists staining from wine, BBQ grease and leaves better than most natural stone | Harder to cut cleanly without the right tools |
| Low maintenance: usually no sealing needed | Standard sand and cement joints tend to fail |
| Good slip resistance when correctly specified | Not all “outdoor” porcelain has the same grip |
| Large-format slabs suit contemporary gardens | Uniform look can feel flat next to period brickwork |
Is porcelain paving slippery?
Good outdoor porcelain isn’t slippery, but you have to check the rating rather than assume.
The two figures to look for are the R rating and the Pendulum Test Value (PTV). Manufacturer Bradstone recommends R11 as the sensible minimum for UK gardens. The PTV comes from the pendulum test that the HSE uses as its standard method, and the HSE’s slip-potential guidance classes a PTV of 36 or above as low slip potential.
Ask for the wet PTV, not just the dry figure. A London patio spends much of the year damp, and shady terraced gardens can stay that way for weeks.
Why porcelain patios fail (and how to avoid it)
This is where the real difference between a good and bad porcelain patio lies.
- No slurry primer. Porcelain is so dense that ordinary mortar struggles to grip it. Suppliers are consistent on this: the underside of each slab needs a slurry primer, and the slab should go down while the primer is still wet. Skip it and slabs can sound hollow within a season, then rock or lift.
- Spot bedding. Laying slabs on a few dabs of mortar leaves voids underneath. Porcelain needs a full mortar bed so it’s supported across its whole area. Voids are where water collects, freezes and cracks things.
- The wrong jointing. Traditional sand and cement joints often crack and wash out of porcelain, because the slab edge doesn’t bond to them well. A jointing compound made for porcelain gives a cleaner, more durable result.
- No fall. Porcelain absorbs very little water, so rain sits on top unless the patio is laid to a gentle fall away from the house. Without it you get puddles, algae in shady corners, and water heading towards your damp-proof course.
- Poor cuts. Porcelain chips easily if cut with the wrong blade. Ragged cuts around drains and edges are the giveaway sign of a rushed job.
- A weak sub-base. No slab, however good, survives a base that moves. A properly compacted sub-base matters as much for porcelain as for any other paving.
How porcelain compares with natural stone
If you’re torn between porcelain and sandstone or slate, the honest trade-off is character vs control. Natural stone varies slab to slab and weathers with age, which suits traditional houses. Porcelain stays the way it looked on day one, which suits clean, modern designs.
We’ve compared other options in pavers vs natural stone vs concrete, which is worth reading alongside this.
Is porcelain right for your garden?
Porcelain is usually a strong choice if:
- You want a modern look with sharp lines and large slabs
- You’d rather not seal or scrub stone every year
- The patio gets heavy use from children, pets or entertaining
It may not be the best fit if your house is period brick and you want the patio to age with it, or if the garden is on a tight budget where cheaper concrete flags would do the job.
Getting it laid properly
Stonecraft Landscapes designs and lays porcelain patios across North and North West London, using primed slabs on a full bed with proper falls and porcelain-specific jointing. Browse finished work in our gallery.
If you’re comparing quotes, ask each contractor how they bed, prime and joint porcelain. Their answer will tell you a lot. When you’re ready, book a free home consultation and we’ll bring samples so you can see the slip finish and colour in your own light.
FAQs
Does porcelain paving need sealing?
Usually not. It’s dense and resists staining, which is one of its main advantages. Joints may still benefit from periodic checking, especially in shady areas.
Can porcelain be laid on an existing concrete patio?
Sometimes, if the concrete is sound, level and drains properly. It still needs priming and a proper bed, and the finished height must stay below the damp-proof course.