IS 2366:1983 is the Indian Standard (BIS) for nail-jointed timber construction. This code lays down the requirements for the design, fabrication, and assembly of nail-jointed timber construction. It covers permissible lateral loads, detailed spacing specifications for nails to prevent splitting, and the selection of appropriate timber and nail materials.
Code of practice for nail-jointed timber construction
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Design Methodology | Permissible Stress Design (PSD) | Limit State Design (LSD / LRFD) | EN 1995-1-1 / NDS |
| Minimum Nail Spacing (parallel to grain) | 10d for Group I & II timber (d=nail diameter) | 12d for non-predrilled members | EN 1995-1-1 |
| Minimum End Distance (loaded end, tension) | 15d for Group I & II timber | 17d for non-predrilled members | EN 1995-1-1 |
| Minimum Penetration in Main Member | Not less than 8d | Minimum 8d for nails without pre-drilling | EN 1995-1-1 |
| Load Duration Factor for Wind Load | 1.50 (factor increases permissible stress) | 1.6 (C_D factor increases reference design values) | ANSI/AWC NDS-2018 |
| Modification for Wet Service Conditions | 0.67 for alternately wet and dry; 0.56 for continuously wet (factor on permissible load) | 0.7 (C_M factor on reference design values for moisture content > 19%) | ANSI/AWC NDS-2018 |
| Group Action for Multiple Nails | No explicit reduction factor specified, but spacing rules apply. | Effective number of fasteners (n_ef) concept reduces capacity for long rows of nails (n_ef < n). | EN 1995-1-1 |