Slate is the most dramatic and visually striking of the common patio materials. Its naturally cleaved (riven) surface gives it serious texture, the deep tones look magnificent when wet, and it’s among the most durable natural stones available — many slate roofs in Hampshire are 200+ years old and still functioning.

Slate is a metamorphic rock formed when ancient sedimentary mud and clay were compressed and heated under massive pressure. That process makes it remarkably hard, naturally water-resistant, and gives it the distinctive cleavage planes that allow it to be split into the thin, even slabs used for patios and roofing.

Our family team installs slate from Brazil, the UK (Wales and Cornwall), India and the USA. Below are the most popular choices for Hampshire patios.

Why slate works so well for patios

Three properties make slate exceptional as a patio surface:

• Natural slip resistance. The riven (cleaved) surface gives slate one of the best natural slip ratings of any patio material — better than honed limestone, better than smooth porcelain, comparable to riven sandstone.
• Very low porosity. Slate’s metamorphic origin makes it virtually non-porous — it doesn’t absorb water, stains brush off easily, and frost damage is essentially impossible on quality slate.
• Extreme durability. Slate is one of the hardest patio materials. It doesn’t chip easily, doesn’t scratch, doesn’t crack under foot traffic. A properly installed slate patio outlasts most surfaces it’s laid alongside.

Brazilian Multi-Colour slate — the showstopper

The Brazilian Multi-Colour slate that’s become so popular over the last decade is genuinely one of the most beautiful patio materials available. The mix of copper, rust, burgundy, gold and charcoal in a single slab means no two patios ever look the same. When wet (after rain, or after washing), the colours intensify dramatically — rust becomes deep red, copper glows, charcoal turns almost black.

It’s also one of the more practical slates: the natural variation hides leaf litter, foot prints and watermarks far better than uniform-coloured stones. For families with kids or dogs running mud across the patio, multi-colour slate is forgiving in a way that pale limestone simply isn’t.

Welsh slate — the heritage choice

If you’re working on a listed building, a conservation area property, or you simply want UK-sourced stone, Welsh slate is the answer. Quarried in North Wales for nearly 1000 years, Welsh slate has a fine, even riven texture in classic blue-grey tones. It’s the slate that’s on most British church roofs and Victorian buildings — durability proven across centuries.

The trade-off is supply and price. Welsh slate is harder to source than Brazilian (only a handful of UK quarries are still operating), the calibrated patio grades take longer to deliver, and prices are 30-50% above Brazilian equivalents. For the right project, it’s worth every penny.

How we install slate patios

Slate installation is technically demanding because the stone is hard and brittle. Cutting it badly cracks it; bedding it on uneven mortar leaves it ringing hollow underfoot. Our family team uses:

• Diamond-blade wet-cutting for clean edges (never percussion-cut)
• Full mortar bed with slurry-prime — no spot bedding
• 10mm joints with polymeric jointing for stability
• Concrete-haunched edges to lock the perimeter
• 1:80 minimum fall with falls routed to drainage or permeable bed
• Colour-enhancing sealer applied after curing to deepen multi-colour tones

Sealing & aftercare

Slate technically doesn’t need sealing — it’s naturally non-porous — but we strongly recommend a colour-enhancing seal coat on multi-colour and black slates to maintain the deep tones. The seal coat doesn’t change the surface texture; it simply enhances colour saturation.

Maintenance is minimal:

• Brush off leaves and debris regularly (riven surfaces collect more than smooth ones)
• Wash twice yearly with mild detergent
• Re-seal every 5-7 years to maintain colour intensity
• Treat moss growth quickly with appropriate slate-safe cleaner