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Masonry & Wall

Stone Soling Calculator (2026) – Heavy Foundation Sub-base

Expert Guide
Babu

Calculate materials for compact heavy-duty foundation beds using rubble or stone soling.

Rubble stones laid for building sub-base soling with sand filling

⚡ Quick Answer

For a 10m x 5m area with 6" stone soling, you need approximately 9.5 m³ of stone (335 CFT) and 1.5 m³ of sand for void filling. For professional structural estimates, visit pro.nirmansutra.com.

🛠️ How It Works

  • •Enter the site length and width to calculate the surface area.
  • •Select the intended thickness of the soling layer.
  • •The tool calculates the volume of loose stones needed (using a 1.25 compaction factor) and the sand required to fill voids.

📐 Calculation Formula

Stone Volume = (Area × Thickness × 1.25) + Wastage
Filling Sand = Area × Thickness × 0.20
Technical Diagram for wall-calculator

📋 Real-Life Example

For 10m x 5m area with 150mm thickness: • Base Volume = 10 * 5 * 0.15 = 7.5 m³ • Loose Stone (1.25 factor) = 7.5 * 1.25 = 9.375 m³ • 5% Wastage = 9.84 m³ (347 CFT) • Sand filling (20%) = 7.5 * 0.20 = 1.5 m³ (53 CFT)

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⚠️ Common Mistakes to Avoid

  • ✕Assuming the base volume is enough — stones are loose and need 20-30% more volume to reach the target height after compaction.
  • ✕Neglecting sand for void filling, which leads to a weak and unstable sub-base.
  • ✕Using uneven stone sizes, causing excessive voids and requiring more sand.

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❓ Frequently Asked Questions

Stones have air gaps between them. To get a solid, 6-inch compacted layer, you must order 25% extra raw stone volume to compensate for compaction losses.
Typically, 15–20% of the total soling volume is required as sand to fill the air voids between the stones for a stable foundation.
Standard thickness is 6 inches (150mm). For soft soil, 9 to 12 inches is recommended for better load distribution.

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Worth NRs. 5,000
NRs. 999 🎯
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