What is the minimum edge distance required for nailed timber joints?

The minimum edge distance is 5 times the diameter of the nail (5d) as per Table 1.

What type of nails should be used according to this IS code?

Mild steel wire nails conforming to IS 723 are recommended for structural timber joints.

Is pre-boring necessary for nail joints?

Pre-boring is required when using large diameter nails (exceeding 1/6th of member thickness) or when driving into split-prone or dense timber.

What is the minimum end distance for nails?

The minimum end distance is 10d for members in compression and 12d for members in tension.

IS 2366

: 1983

Code of practice for nail-jointed timber construction

CurrentSpecializedCode of PracticeStructural Engineering · Building Construction Practices incl. Painting, Varnishing

Download PDF BIS Portal Google

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

Quick Reference Values

Minimum edge distance5d (where d is nail diameter)

Minimum end distance in tension12d

Minimum end distance in compression10d

Minimum spacing between nails in a row (parallel to grain)10d

Minimum spacing between rows of nails (perpendicular to grain)5d

Maximum timber moisture content at fabrication20%

Practical Notes

Always stagger nails rather than aligning them on the same grain line to minimize the risk of the timber splitting.

If the nail diameter exceeds 1/6th of the timber thickness, or if using dense hardwoods, pre-bore holes to about 4/5th of the nail diameter.

Avoid driving nails parallel to the grain (into the end grain) as it significantly reduces both withdrawal resistance and lateral load capacity.