Standard Indian Civil Engineering Constants Used Across Our BOQ Engine
Every calculator in the Parth Enterprises Engineering Suite uses verifiable Indian Standard physical densities, bulking/void conversion constants, and field-audited 2026 Delhi NCR commercial rates—never arbitrary black-box guesses:
| Engineering Constant / Trade | Indian Standard | Exact Mathematical Value | Site Quantity Surveying Application |
|---|---|---|---|
| Mild Steel & TMT Specific Gravity | IS 2062 / IS 1786 | 7,850 kg/m³ (D² ÷ 162.2 kg/m) | MS plates, ISMB girders, SHS hollow tubes & Fe550D reinforcement bars. |
| Concrete Wet-to-Dry Volume Factor | IS 456:2000 | 1.54 × Wet Compacted m³ | Accounts for ~35% fine/coarse aggregate air voids + OPC cement density 1,440 kg/m³. |
| Plaster & Masonry Dry Mortar Factor | IS 1661 / IS 2212 | 1.33 × Wet Mortar Volume | 12mm/15mm 1:4 bull-mark cement plaster & 230mm/115mm brickwork joint mortar. |
| Polymer Tile Adhesive Consumption | IS 15477:2019 | 1.35 kg / m² per mm Bed | Yields ~26–28 sq.ft per 20 kg bag at 6mm solid notched-trowel commercial bedding. |
| Toughened Architectural Glass Load | IS 2553 Part 1 | 2.50 kg / m² per mm Thickness | 12mm frameless office partition glass = 30 kg/m² (2.79 kg/sq.ft) dead load on slab soffit. |