Black Diamond Gravel | 20mm Black Basalt Chippings

How much will I need?

As a guide, one tonne covers roughly 10–12m² at a depth of 50mm (2 inches). That means a 750kg bag covers around 7.5–9m², a 500kg bag around 5–6m², and each 25kg handy bag roughly 0.25–0.3m². Measure your area, then round up rather than down so you're not left short.

Can I walk or drive on it?

Yes. For paths and driveways, lay it at around 40–50mm over a compacted, well-drained base. Check the Best for line in the product details for the uses this grade suits.

Do I need a weed membrane?

We'd recommend one. Laying a permeable landscape membrane underneath helps stop weeds coming through and keeps the stone from mixing into the soil, so it stays cleaner and lasts longer.

Which bag size should I choose?

Bulk bags are the most economical way to buy for larger areas. 25kg handy bags (where offered) are ideal for smaller jobs, or if access is tight and the stone needs carrying through the house or over a wall.

Will it look exactly like the photos?

This is a natural stone, so colours and tones vary slightly between batches and look richer when wet. If you're matching existing gravel or slate, get in touch before ordering.

What if my order arrives damaged or isn't right?

Email sales@oakandoutdoor.co.uk within 48 hours with your order number and photographs. We'll liaise with Dandy's and arrange a prompt resolution.