IS 1361:1978 is the Indian Standard (BIS) for steel windows for industrial buildings. This standard specifies the requirements for materials, fabrication, dimensions, and finishing of steel windows explicitly intended for industrial buildings. It standardizes window sizes based on a 100 mm modular system to ensure uniformity and simplified integration into standard masonry openings.
Specification for steel windows for industrial buildings
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Steel Material | Hot rolled mild steel sections conforming to IS 1079 or IS 1977. | Hot-rolled steel sections complying with SANS 1431 grade 300WA. | SANS 727:2003 |
| Corner Construction | Corners of frames and casements shall be mitred and flash butt-welded. | Corners shall be mitred and welded, or tenon-riveted. | BS 6510:1984 |
| Corrosion Protection (Galvanizing) | Hot-dip galvanizing shall conform to IS 2629 (min 300 g/m²). | Hot-dip galvanized coating shall comply with BS 729 (min 460 g/m² on sections ≥ 1.5 mm thick). | BS 6510:1984 |
| Air Permeability | Not specified. | Mandatory testing and classification (Class 1 to 4) based on leakage rate at test pressure. | BS EN 14351-1 |
| Water Tightness | Not specified (implied by good workmanship). | Mandatory testing and classification (e.g., Class 1A to 9A) based on pressure at which leakage occurs. | BS EN 14351-1 |
| Thermal Transmittance (U-value) | Not specified. | Must be declared by the manufacturer. Value is either calculated or tested (unit: W/m²K). | BS EN 14351-1 |
| Glazing Method | Glass to be bedded in putty and secured with steel spring glazing clips. | Specifies a performance grade (PG) which the whole assembly including glazing must meet. | AAMA/WDMA/CSA 101/I.S.2/A440-17 |