Sand Sub-Base Calculator
Work out sharp sand and sub-base aggregate for paving foundations.
How We Calculate This
This calculator estimates MOT Type 1 sub-base aggregate and sharp sand for paving foundations.
Sub-base
Tonnes = Area × Depth × Density. MOT Type 1 compacted density is ~1,800 kg/m³. Lay in 50mm compacted layers.
Sharp sand
The sand blinding layer sits on top of the sub-base. Typically 30-50mm deep, screeded level as the final bed for slabs. Sharp sand density is ~1,500 kg/m³.
Membrane
A weed membrane between sub-base and sand prevents weed growth through joints. Allow 10% extra for overlaps.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates based on standard gardening guidelines. Results may vary with soil conditions, climate, and plant varieties.