20mm limestone is one of the most practical and versatile materials we carry. The smaller sizing makes it easy to spread and compact, and the angular profile locks together under load — making it a go-to choice for Calgary driveways, pathways, drainage projects, and utility applications. If 40mm limestone is the heavy-duty base material, 20mm is the workhorse that handles the finish work.
What it's used for
- Driveway top layer — the 20mm size compacts firmly and creates a clean, stable surface that handles Calgary winters and snowplowing well
- Pathways and walkways — easy to spread and grade, comfortable underfoot, and stays in place with regular foot traffic
- Drainage applications — used in French drains, drainage trenches, and around weeping tile where water needs to move freely
- Pipe bedding — commonly specified as bedding material around drainage pipe and utility installations
- Compactable base layer — works well as a sub-base under interlock, flagstone, or decorative rock
- Parking pads and back lanes — tough enough for vehicle traffic, easy to top up and maintain
- Landscape edging and borders — the neutral grey colour and clean sizing work well as a border material between grass and planting beds
20mm vs 40mm — which one do you need?
The 20mm size compacts tighter and creates a smoother surface — better for driveways you walk on regularly, pathways, and anywhere you want a firm, finished feel. The 40mm size has larger void space between rocks, making it better for heavy drainage applications and areas that take vehicle loads. If you're not sure, give us a call and we'll point you in the right direction.
How much do you need?
For a 4-inch driveway layer, budget roughly 1.2 cubic yards per 100 square feet. Use our free calculator for an exact number.
Where we deliver
Same-day bulk delivery across Calgary, Airdrie, Chestermere, Cochrane, Okotoks, and Langdon.
📞 403-510-9011