IS 14242:1995 is the Indian Standard (BIS) for design and construction of roof with l-panel units. This code of practice outlines the design, manufacturing, and construction requirements for roofs and floors built using precast reinforced concrete L-shaped panel units. It covers material specifications, structural design principles, manufacturing tolerances, and on-site erection procedures, including the placement of in-situ concrete and waterproofing.
Code of practice for design and construction of roof with L-Panel units
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Min. Grade of Concrete for Prestressed Unit | M35 (35 N/mm²) | Typically C30/37 (30 N/mm² cylinder / 37 N/mm² cube) or higher | EN 1992-1-1 / EN 13225 |
| Min. Grade of Concrete for Structural Topping | M15 (15 N/mm²) | Typically C20/25 (20 N/mm² cylinder strength) or higher | General practice based on EN 1992-1-1 |
| Partial Safety Factor for Concrete (γc, ULS) | 1.5 | 1.5 | EN 1992-1-1 |
| Partial Safety Factor for Steel (γs, ULS) | 1.15 | 1.15 | EN 1992-1-1 |
| Min. Concrete Cover for 'Moderate' Exposure (Prestressed) | 20 mm | ≈ 35 mm (c_min + Δc_dev for XC3/XC4 exposure, 50-year life) | EN 1992-1-1 |
| Permissible Upward Deflection (Camber) at Erection | Span / 300 | Generally Span / 240 to Span / 360 (often project specific) | PCI MNL-120-17 / General Practice |
| Imposed Live Load on Roof (no access) | 0.75 kN/m² | ≈ 0.96 kN/m² (20 psf) | ASCE 7-16 (used with ACI 318) |