IS 3386:1979 is the Indian Standard (BIS) for wooden fence posts. This standard lays down the specifications for wooden fence posts, covering the suitable timber species, dimensions, dimensional tolerances, permissible natural defects, and the necessary preservative treatments for outdoor durability.
wooden fence posts
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Preservation Standard Reference | IS 401: Code of practice for preservation of timber | BS 8417: Preservation of wood. Code of practice | BS 1722-7:2006 |
| Ground Contact Use Classification | Describes hazards but doesn't use a numeric class system. | Use Class 4 (UC4) | BS 8417 / EN 335 |
| Timber Species Example | Sal (Shorea robusta), Teak (Tectona grandis), Deodar (Cedrus deodara) | European redwood/whitewood (Pinus sylvestris/Picea abies), Douglas fir, Larch | BS 1722-7:2006 |
| Standard Post Lengths | 1.5 m, 1.8 m, 2.1 m, 2.4 m | 1.65 m (for 1.05m fence), 1.8 m (for 1.2m fence) | BS 1722-7:2006 |
| Knot Size Limitation | Permitted knots shall not have a diameter exceeding one-third of the width of the face. | Sound knots shall not have a diameter greater than one-third of the width of the face on which they occur. | BS 1722-7:2006 |
| Post Top Finish | Sloped on two or four sides from the centre. | Weathered (two-way or four-way), rounded, domed, or pointed. | BS 1722-7:2006 |
| Minimum Top Diameter (Round Posts) | 100 mm for 1.5 m length; 125 mm for 2.4 m length | 75 mm for intermediate posts; 125 mm for straining posts | BS 1722-7:2006 |