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.

40mm 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 is the main difference between 20mm and 40mm Plum Slate Chippings?

The 40mm Plum Slate Chippings are larger and flatter than the 20mm variant. While 20mm slate settles more tightly for pathways, 40mm slate offers a bolder, more structural look that is ideal for ground cover over expansive beds, rockeries, and larger landscaping features.

What colors will I see in 40mm Plum Slate, and do they change when wet?

Plum Slate features a rich mix of deep purple, plum, and subtle heather-grey tones. When dry, the large flat stones have a soft, matte pastel finish. When wet, the rich plum colors darken and intensify dramatically, adding strong visual interest during rain.

Is 40mm Plum Slate Chippings safe to use in and around fish ponds?

Yes, natural slate is completely inert and fish-friendly. It will not alter the pH level of pond water or leach harmful minerals into aquatic environments. It is recommended to wash the slate prior to placing it directly into a pond to remove any fine dust from transit.

Is 40mm Plum Slate suitable for driveways?

Plum slate is generally not recommended for driveways. Because slate is a naturally layered rock, heavy vehicular weight can crush the flat pieces, causing them to break down into smaller fragments over time. Harder angular aggregates like granite or basalt are better suited for driveways, whereas slate excels on garden borders, rockeries, and footpaths.

How does 40mm Plum Slate aid in weed control and moisture retention?

The large, flat shape of 40mm slate forms an effective, heavy cover over soil, blocking sunlight to suppress weed growth. When laid over a high-quality geotextile membrane, it also acts as an insulating layer that reduces water evaporation, helping underlying soil stay moist during warm weather.