IS 5390:1984 is the Indian Standard (BIS) for construction of timber ceilings. This standard provides guidance on the construction of timber ceilings, including suspended and directly fixed types. It covers the selection of materials like timber and fasteners, design aspects such as joist spacing and support, construction methods for the framework and boarding, and finishing treatments.
Code of practice for construction of timber ceilings
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Ceiling Joist Spacing | Not to exceed 600 mm centres. | Typically 400 or 600 mm, but span tables allow various spacings based on joist size, span, and load. | NZS 3604:2011 |
| Ceiling Batten Spacing | 300 to 450 mm centres. | Typically 450 mm or 600 mm, depending on the lining material's thickness and stiffness. | AS 1684.2-2010 |
| Hanger Specification | Prescribed as 25 mm x 5 mm mild steel flats. | Performance-based; proprietary engineered hangers are specified by their load capacity, not a fixed size. | AWC WFCM 2018 |
| Timber Moisture Content (at installation) | As per IS 287, typically 12-15% for interior use. | Generally required to be below 20% (often 18%) at time of lining to be considered 'dry'. | NZS 3604:2011 |
| Fixing of Battens to Joists | Fixed with 75 mm long wire nails. | Specified by nail type and number per connection, e.g., '2/90x3.15mm plain head nails' per intersection. | AS 1684.2-2010 |
| Typical Lining Material Thickness | Recommends 4 mm for Plywood, 3.2 mm for Hardboard. | Predominantly gypsum board (plasterboard) with standard thicknesses of 10 mm or 13 mm (1/2 inch). | General practice in AUS/NZ/USA |