Knowing how much road salt to use is essential for keeping surfaces safe and avoiding waste. Using the right amount ensures your driveway, car park, or pathway is clear of ice and snow while keeping costs and environmental impact to a minimum.
💡 General Guidance
For preventative gritting (before frost or snowfall):
- Apply 10–15 grams per square metre
This helps stop ice forming and makes snow easier to clear later.
For melting existing ice or light snow:
- Apply 20–40 grams per square metre
Heavier applications may be needed in more severe conditions or where compacted snow is present.
🧭 As a guide, one 23kg bag of rock salt typically covers around:
- 1,500–2,000 m² for light frost prevention
- 600–1,000 m² for heavier de-icing
⚙️ Factors That Affect How Much You’ll Need
- Temperature – Rock salt is most effective down to around –6°C. Below this, consider additional measures such as grit or mechanical clearance.
- Surface Type – Porous or rough surfaces may require slightly more salt than smooth tarmac.
- Traffic Levels – Busy areas help spread the salt more evenly, so less may be needed compared to quiet zones.
- Weather Conditions – Ongoing snowfall or rain will reduce effectiveness; reapply as needed.
🧂 Top Tips for Effective Gritting
- Apply before frost to prevent ice bonding to the surface.
- Store salt in a dry place to avoid clumping.
- Reapply after heavy rain or once ice has melted, if temperatures drop again.
- Use white rock salt for cleaner areas like paths and entrances, and brown rock salt for roads and car parks.
🚚 Need Bulk Quantities?
TW Salt offers 23kg bags, bulk bags (approx. 1 tonne), and pallet options with fast nationwide delivery — perfect for homes, schools, councils, and commercial sites.
