Porcelain patio installation

What makes porcelain different

Outdoor porcelain is a fired ceramic slab, usually 20mm thick, made to be dense and almost non-porous. That gives it real advantages in a garden: it resists staining from food, drinks and leaves, it does not need sealing, and it holds its colour. Because it is manufactured, it comes in very consistent sizes, so you can have large-format slabs, tight joints and a sharp, modern finish. Many ranges imitate stone, slate, concrete or timber.

The same density that makes porcelain easy to live with makes it harder to lay. Ordinary mortar does not stick well to a smooth, non-absorbent back, and porcelain is very hard to cut cleanly without the right blades. A porcelain patio laid like a sandstone one is the most common reason slabs come loose.

How a porcelain patio is installed

The groundwork is the same as any good patio: dig out, compact a granular sub-base and set falls so water runs away from the house and the damp-proof course. Porcelain slabs are rigid and flat, so the base has to be accurate; any hollow underneath shows up as a rocking slab.

Each slab has a bonding primer applied to the back immediately before laying, and goes down on a full bed of mortar so there are no voids. Slabs are levelled carefully against each other, because the flat, consistent edges make any lip between slabs easy to see and easy to trip on. Cuts around drains, steps and edges are made with a proper porcelain blade.

Joints are usually filled with a brush-in or slurry jointing compound designed for porcelain, giving narrow, neat lines. Movement joints may be needed on larger areas or where the patio meets the house.

Things to think about before you choose

Check the slip rating. Outdoor porcelain should have a textured or anti-slip surface, which matters around doors and under trees where the patio can stay damp. Think about colour too: very dark slabs can get hot in direct sun, and very pale ones show dirt sooner.

Porcelain suits contemporary houses, large glazed doors and gardens where you want the inside floor to flow out to the patio. If you prefer the softer look of natural stone, our Indian sandstone patios page explains that option.

When you ask for an estimate, it helps to have the range or a sample of the slab you like, a rough idea of the area and any doors, drains or steps the patio needs to meet. If you have not chosen a slab yet, we can talk through how different sizes and colours will look against your house and how many cuts a layout is likely to need.