As an approximate guide, one bulk bag will cover:

• 10–12m² at a depth of 50mm

• 6.5–7.5m² at a depth of 75mm

• 5–6m² at a depth of 100mm

Garden borders, flower beds, and footpaths commonly require around 40mm to 50mm of decorative chippings, while domestic driveways typically require approximately 50mm to 75mm depending on the ground conditions and sub-base.

These figures are estimates only. Actual coverage will vary according to the bag weight, ground conditions, compaction and the accuracy of the excavation.

Not sure how many bags you require? Call our Rugby team on 01788 866945 with the length, width and required depth.

20mm Zebra decorative pebbles are intended as a decorative surface, border, or driveway topping. Colour, natural veining, and angular shape can vary according to the source of the stone.

Excavate the area to the required depth and prepare the ground appropriately. A suitable geotextile membrane may be required to prevent weed growth and stop the subgrade from mixing.

Spread evenly over the prepared sub-base to the recommended depth. Rake or lay by hand to ensure an even, flat distribution across the entire area.

Check the finished surface level and slope to ensure proper drainage away from surrounding structures. Ensure the depth is consistent to prevent exposed patches or uneven surface layers.

Requirements vary according to ground conditions, loading, and the intended use of the surface. Follow the project specification or seek professional advice where appropriate.

Available for collection from our Rugby branch or local delivery using our own fleet.

Bulk bags will normally be delivered by a crane-equipped lorry. Delivery is kerbside and the final offloading position is always subject to safe access and the driver’s discretion.

Please tell us before delivery about:

• Narrow roads or restricted entrances
• Parked vehicles or limited turning space
• Overhead cables, trees or other obstructions
• Soft, sloping or unsuitable ground
• Any other access concerns

Enter your postcode on the product page to check your delivery area. We’ll confirm the delivery date after your order is placed.

What are 20-40mm Zebra Pebbles made of?

They are a mixture of smooth, naturally rounded black basalt and white dolomite stones. This gives them a distinct, high-contrast monochrome look.

What are the best uses for this size stone?

At 20–40mm (roughly 0.8 to 1.6 inches), these stones work exceptionally well for:

• Garden borders and flower beds

• Rockeries and alpine gardens

• Pot toppers and raised planters

• Water features like fountains and dry riverbeds

Are 20-40mm Zebra Pebbles suitable for driveways or paths?

They can be used for decorative footpaths, but they are generally not recommended for driveways. Rounded pebbles roll under tires and shift under heavy foot traffic. Angular gravels interlock better for driveways, whereas rounded 20-40mm stones are best reserved for accent areas.

Do the stones look different when wet?

Yes. When dry, they have a softer, dusty grey/charcoal and off-white appearance. When wet, the black basalt deepens to a rich jet black and the white dolomite pops, making them look especially striking near water features.