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Fossil Black Tumbled Outdoor Sandstone Cobble

from £54.00 /m²

Select Size

Size

per tile

per m²

200x50x45-55

Outdoor only

£0.90

£90.00

200x50x20-25

Outdoor only

£0.54

£54.00

Select quantity

Sold per tile

Add 10% Wastage

Total

£0.00

Available for delivery in 3-5 working days
Delivery date and costs confirmed at checkout

Elevate your exterior space with the refined, earthy character of our Fossil Black Riven Sandstone Cobbles. This distinctive charcoal sandstone features subtle tan undertones, creating a rich, weathered look that complements traditional garden designs with ease.

Offering a naturally rustic texture and deep, organic colouring, these cobbles bring depth and authenticity to pathways, patios, and feature areas, making them a popular choice for classic exterior landscapes.

For driveways, busy walkways, or projects that require a more substantial stone, opt for our robust 40–45 mm cobbles. For lighter-use spaces such as garden borders or decorative accents, our slimmer 20–25 mm option delivers the same timeless appeal with a refined profile.

Properties	High traffic, Worn edge finish, Outdoor
Slip rating	NPD i
Underfloor heating	No
Shade variation	V4 - Substantial variation
Sealing required?	Optional
Suggested grout width	5mm+
Suggested grout colour	Slate Grey, Black

Bathroom	Walls	No
Bathroom	Floors	No
Shower	Walls	No
Shower	Wet room floors	No
Kitchen	Walls	No
Kitchen	Floors	No
Kitchen	Splashbacks	No
Outdoors	Walls	No
Outdoors	Floors	Yes

If you require any further information on suitability and slip ratings for areas such as wet rooms, please feel free to contact us so that we can offer the correct advice and for your situation.

When using outdoor limestone tiles, either leave to weather naturally or seal with Fila Mp90 Eco Xtreme . This will protect the stone and delay the effects of weathering.

Proper ground preparation is essential for the successful installation of stone flagstones or cobbles, and it depends on both the intended use of the paved area and the specific site conditions.

Clearance Below Damp-Proof Course

It is crucial to ensure that the paving or cobbling is installed at least 150mm below the dampproof course (DPC) of any building. Additionally, a gradient of 1:60 should be maintained to create a ‘fall’ that ensures water drains away from the building, preventing water ingress.

Stabilising Layer

A stabilising layer, typically 100mm of scalping or crushed hardcore, should be laid down to create a solid foundation. This is followed by a 30-40mm sand bed, which should be compacted using a vibrating plate compactor to provide a stable base.

Laying the Perimeter Tiles

The perimeter tiles should be bedded in wet mortar to firmly anchor them in place and prevent any potential ‘spread’ during installation. This ensures the outer edges are stable before filling in the central area.

Bedding the Remaining Tiles

For the remaining tiles, a semi-dry or dry 4:1 sand/cement mix can be used for bedding, depending on the thickness of the stone. The right mix ensures secure adhesion to the substrate while allowing flexibility for the stone’s natural movement.

Considerations for Stone Type and Porosity

The porosity and shade of the stone must always be considered during installation. For example, lighter-coloured stones should not be laid with a wet mix, as pigments from the cement can bleed into the stone and cause permanent stains.

Suitable Substrate for External Stone Tiles

The prepared substrate will support exterior stone tiles of 20mm thickness or above. It is essential to verify that the material is suitable for exterior use. For thinner tiles, including many porcelain options, they can be laid on a concrete slab with adhesive and grout, following the same procedures used for internal applications. The concrete slab must be designed and installed according to relevant standards for external applications.

Grouting and Jointing

After the tiles are fixed, the grout gaps can be filled with sharp or pit sand, which should be brushed into the dry joints to finish the installation.

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Delivery

We offer fast, reliable delivery across the UK & Ireland using our own specialised fleet alongside an external pallet service.

Delivery availability & charges

Orders are typically delivered within 3-5 working days, with delivery date and costs confirmed at checkout.
Most deliveries take place between 8:00 am and 5:30 pm, Monday to Friday, excluding Bank Holidays.
Delivery charges depend on the size and weight of your order and are shown separately from product prices to keep our tiles competitively priced.
Delivery to UK mainland starts at £45 per crate, which covers up to approximately 1000 kg.
Parcel delivery charges (UK mainland only):
Up to 5kg – £4.12 | Up to 10kg – £6.62 | Up to 20kg – £8.29
A.M. deliveries (8:00 am–1:00 pm) are available for an additional £18 + VAT, subject to area.

Further information

Someone must be available to accept, sign for, and safely store the goods, which the driver will place at the nearest accessible point, such as the driveway or kerbside.
Special orders, slabs, large-format tiles, some bathware, and sizeable orders are usually delivered using specialist off-load vehicles, which may increase delivery times.
UK Mainland deliveries exclude the Republic of Ireland, Northern Ireland, Channel Islands, and the Scottish Highlands, please contact our Sales Team for these areas.
For overseas orders, email enquiries to [email protected].

Returns

We hope you love your Mandarin Stone products, but if not, we offer a 30-day returns policy.

Goods must be returned within 7 days of receiving authorisation.
Return address: Mandarin Stone, Unit 1 Wonastow Road Industrial Estate, Monmouth, NP25 5JB.
All returns must be scheduled in advance and made between 8:30 AM and 4:00 PM, Monday to Friday.
Please clearly mark the returns number on all packages, boxes, crates, and pallets.
Tiles are fragile, so please ensure packaging is secure; refunds will not be issued if items or packaging are returned in unsaleable condition.
Refunds for resalable goods will be processed within 10 days, minus a 20% restocking fee.