Half Bulk Bag Mixed Sand & Gravel Ballast
PLEASE NOTE THIS IS A HALF BULK BAG
A pre-mix of sand and gravel, also known as ballast concrete mix
Available in: Bulk Bags (approx 1 tonne), Half Bulk Bags (approx 1/2 tonne) Bulk Loose (from 1/2 tonne, on enquiry), Poly Bags (approx 25kg)
As an approximate guide, one bulk bag will cover:
• 9–10m² at a depth of 50mm
• 4.5–5m² at a depth of 100mm
• 3–3.5m² at a depth of 150mm
Footing foundations and shed bases commonly require around 100mm to 150mm of concrete depth, while post holes, pathway bases, and smaller concrete slabs typically require 75mm to 100mm depending on expected loading.
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.
Ballast is intended for mixing with cement to produce coarse concrete, post mix, or heavy sub-bases. Colour, grain size, and stone distribution can vary according to the source of the aggregate.
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 ballast with cement and water in the appropriate ratio (commonly 4:1 or 6:1 depending on the structural requirement) to produce concrete, or spread it dry as a bulk fill layer. Pour or place the mix evenly into the prepared area and tamp down thoroughly to eliminate air pockets.
Check the finished level and fall using a spirit level or straight edge to ensure proper surface drainage before the concrete sets.
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 concernsEnter your postcode on the product page to check your delivery area. We’ll confirm the delivery date after your order is placed.
What is ballast?
Ballast is a coarse aggregate mixture consisting of sharp sand and crushed stone or gravel (typically up to 20mm in size). The combination of small sand particles and larger stones creates a dense, heavy-duty material ideal for high-strength applications.
What is ballast used for?
Ballast is primarily mixed with cement and water to produce heavy concrete for foundations, footings, fence post settings, path bases, and structural slabs.
What is the difference between ballast and sharp sand?
Sharp sand contains only fine, angular sand grains, making it suitable for mortar mixes and paving screeds. Ballast contains both sharp sand and larger gravel stones, giving it the extra bulk and mechanical strength needed for structural concrete.
Can ballast be used as a decorative gravel?
No. Because ballast contains a high proportion of sand and variable stone sizes, it is intended purely as a functional construction aggregate rather than a decorative top layer or garden surface.
Does ballast drain well?
While ballast allows water to pass through in its raw form, its fine sand content makes it pack down tightly. It is designed to be compacted and bound into concrete rather than used as a free-draining drainage layer or sub-base substitute.
Why does the appearance of ballast vary?
Ballast is sourced from local quarries, meaning the stone type (such as flint, limestone, or granite) and sand tone will naturally vary by region. Because it is used for structural concrete, color variation has no impact on its strength or performance.
