Paving Bed Calculator
Area: m²
Sand Only: tonnes
Total Mix: tonnes
Cement Total: kg
25kg Bags (UK):
94lb Bags (US):
Paving Bed Calculator (UK & USA)
```This calculator helps homeowners, DIYers, and landscapers estimate how much bedding mortar or sharp sand is needed to lay paving slabs securely. Whether you're installing a patio in Manchester or a walkway in Minnesota, this tool is ready to assist!
Technical Guidance
- 🇬🇧 UK: Use 4:1 or 5:1 sharp sand to cement mix for bedding mortar.
- 🇺🇸 USA: Bedding typically uses mortar mix or polymeric sand depending on slab type.
- Recommended depth: 25–50mm (1–2") bedding layer depending on load.
Common Mix Ratios
| Use Case | Sand:Cement Ratio |
|---|---|
| Standard Patio | 4:1 |
| Driveway (heavier load) | 3:1 |
| Budget DIY | 5:1 |
Density Reference
| Material | Density (kg/m³) | Density (lb/ft³) |
|---|---|---|
| Sharp Sand | 1600 | 100 |
| Mortar | 2100 | 131 |
Pro Tips
- Always allow 10% for wastage when ordering materials.
- Use plasticiser for smoother mortar and easier handling.
- Compact bedding layer before placing slabs.
Common Mistakes
- Skipping compaction leads to uneven paving.
- Incorrect mix can cause bedding to crumble or shift.
- Too dry or wet mix affects curing and strength.
FAQs
- How much sand do I need per m²?
About 25–50kg depending on depth and compaction. - Can I use just sand for bedding?
No — cement improves stability and bond. - What's best for a porcelain patio?
Full mortar bed with slurry primer on the back of slabs.
