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Sand Blinding Calculator

Calculate the fine sand blinding layer (typically 25mm–50mm / 1–2 inches) applied over hardcore to protect damp-proof membranes (DPM).

Blinding Quantities

Real-Time
Blinding Sand Volume
0.00 m³
0 yd³
Sand Weight (Tonnes)
0.00 T
0 US Tons
Bulk 1-Tonne Bags
0 Bags
Jumbo builder bags
Slab Area
0 sq ft
Surface coverage
Visual Engineering

Hardcore Blinding & DPM Protection

Smooth 50mm sand blinding layer over sharp hardcore rocks beneath waterproof DPM membrane.

DPM MEMBRANE (PROTECTED) 50MM BLINDING SAND BLINDING MATH • Blinding Vol = Slab Area × 50mm • Standard depth: 25mm to 50mm • Prevents puncture of 1200g DPM • Compaction / Void Fill: +10%

Hardcore Blinding & DPM Protection

Smooth 50mm sand blinding layer over sharp hardcore rocks beneath waterproof DPM membrane.

Mathematical Theory

Engineering Calculations & Formulas

Mathematical formulas and engineering constants powering this calculator.

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Blinding Volume Formula

Calculates volume of smooth sand needed to fill hardcore voids.

Blinding m³ = Slab Area (m²) × (Depth mm / 1000) × 1.10
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Imperial Blinding yd³

Converts square footage and 1-2 inch blinding thickness to yards.

Blinding yd³ = (Slab Area sq ft × Depth in) / 324
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Blinding Tonnage

Total sand delivery weight in metric tonnes.

Weight (t) = Blinding m³ × 1.60 tonnes/m³