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, rockeries, 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 Plum Slate decorative chippings are intended as a decorative surface, border, or driveway topping. Colour, natural subtle sparkled texture, 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 colors are featured in Plum Slate, and how does rainfall affect them?

Plum Slate Chippings showcase a warm blend of rich plum, deep purple, and subtle reddish-grey tones. When dry, the slate exhibits a soft, pale pastel matte finish. When wet, the colors darken dramatically into vivid, deep magenta and purple shades that add striking contrast to garden greenery and stonework.

What are the ideal uses for 20mm Plum Slate Chippings?

The 20mm size is exceptionally versatile and works well for garden borders, footpaths, rockeries, alpine beds, and surrounding garden ponds. Because slate chippings are naturally flat and angular, they lie remarkably flat, making them comfortable to walk on while maintaining a sleek, tidy appearance.

Are 20mm Plum Slate Chippings fish-friendly?

Yes, natural slate is completely inert and fish-friendly. It does not alter the pH balance of water, making 20mm Plum Slate an excellent choice for lining pond edges, building artificial streams, or decorating aquatic plant containers. Rinsing the slate prior to submersion will remove any remaining stone dust.

How does Plum Slate help with weed suppression and plant care?

Plum Slate forms a heavy, light-blocking blanket that drastically reduces weed growth when paired with a geotextile membrane. Additionally, slate chippings act as a natural mulch by reflecting excess surface heat and helping the underlying soil retain vital moisture during hot summer periods.