As an approximate guide, one half bulk bag will cover:

• 9-10m² at a depth of 25mm

• 4.5-5m² at a depth of 50mm

• 2.25-2.5m² at a depth of 100mm

Artificial grass laying courses, block paving bases, and pathway screeding layers commonly require around 25mm to 50mm of granite dust, while deeper levelling layers or bedding bases may require 75mm or more depending on project requirements.

These figures are estimates only. Actual coverage will vary according to the bag weight, moisture content, 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.

Granite dust is intended as a compactable laying course, screeding material, or sub-base fine rather than a decorative finished surface. Colour and grain texture can vary according to the source of the stone.

You can use our online calculator at https://www.melbros.com/calculator

Excavate the area to the required depth and prepare the ground appropriately. A suitable geotextile membrane may be required where the subgrade is soft, unstable, or likely to mix with the aggregate layer.

Mix the granite dust (grano) with cement and water in the appropriate ratio (typically 3:1 or 4:1 for a heavy-duty screed or mortar bed) using a mechanical mixer, or spread it dry as a fine, firm bedding layer. Lay and compact the material evenly over the prepared area, screeding to a smooth finish using a straight edge.

Check the finished level and fall to ensure proper surface drainage before laying paving units or allowing a concrete/screed mix to cure.

Requirements vary according to ground conditions, loading, and the intended application. 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 granite dust?

Granite dust, also known as granite fines or 0-4mm granite sand, is a finely crushed aggregate produced during the granite crushing process. It consists of small stone particles ranging from fine dust up to 4mm grit.

What is granite dust used for?

Granite dust is primarily used as a smooth laying course for artificial grass, block paving, and flagstones. It is also used to fill gaps between paving slabs, mix into heavy-duty concrete, or level out sub-bases before laying hardscaping features.

What is the difference between granite dust and sharp sand?

While both are coarse, angular materials, granite dust is made from crushed hard granite rock rather than quarried silica sand. Granite dust compacts much firmer and creates a more durable, rot-resistant base, making it the preferred choice for artificial lawns and heavy paving.

Is granite dust suitable for artificial grass?

Yes. Granite dust is considered the gold standard laying base for artificial grass installations. When compacted, it creates a flat, solid foundation that allows water to drain freely through while preventing the surface from shifting or holding moisture beneath the lawn.

Does granite dust compact well?

Yes. Due to its varied particle sizes—from fine dust to 4mm angular grit—granite dust binds together exceptionally well when compacted with a vibrating plate or hand tamper, forming a rigid, non-flexible screed layer. We hire out vibrating plates if required.

Is granite dust fish-friendly and safe for gardens?

Yes. Granite is an inert, non-reactive natural rock that does not affect soil or water pH. It is safe for garden beds, footpaths, and surrounding aquatic features (though washing away fine dust before submerged pond use is recommended).