40mm limestone is one of the most versatile and hardworking materials you can put in your yard. The angular, chunky profile locks together under load, making it ideal for drainage, driveways, and areas that take heavy foot or vehicle traffic. Unlike rounded decorative rock, limestone grips and stays put.
What it's used for
- Driveway base and surface layer — the angular edges compact and interlock, creating a stable, load-bearing surface that handles Calgary winters well
- French drains and drainage trenches — large void space between rocks allows water to move freely and prevents pooling
- Retaining wall backfill — used behind retaining walls to allow drainage and reduce hydrostatic pressure
- Erosion control — holds slopes and banks in place where smaller material would wash away
- Rural roads and laneways — a go-to material for acreage driveways and farm lanes
- Septic field cover and pipe bedding — commonly specified for utility and drainage applications
Why 40mm
The 40mm sizing hits a sweet spot — large enough to drain fast and lock together, but easy to spread and grade with standard equipment. If you're doing a driveway, it works well as a standalone surface or as a base layer under decorative rock.
How much do you need?
Use our free calculator to get your exact cubic yard count — just plug in your length, width, and depth.
As a general guide: for a standard driveway at 4 inches deep, budget roughly 1.2 cubic yards per 100 square feet. Add 10–15% for waste and settling.
Where we deliver
Same-day bulk delivery across Calgary, Airdrie, Chestermere, Cochrane, Okotoks, and Langdon.
📞 403-510-9011