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2304.9.3.2 Nailing
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The length of nails connecting laminations shall be not less than two and one-half times the net thickness of each lamination. Where decking supports are 48 inches (1219 mm) on center or less, side nails shall be installed not more than 30 inches (762 mm) on center alternating between top and bottom edges, and staggered one-third of the spacing in adjacent laminations. Where supports are spaced more than 48 inches (1219 mm) on center, side nails shall be installed not more than 18 inches (457 mm) on center alternating between top and bottom edges and staggered one-third of the spacing in adjacent laminations. For mechanically laminated decking constructed with laminations of 2-inch (51 mm) nominal thickness, nailing in accordance with Table 2304.9.3.2 shall be permitted. Two side nails shall be installed at each end of butt-jointed pieces. Laminations shall be toenailed to supports with 20d or larger common nails. Where the supports are 48 inches (1219 mm) on center or less, alternate laminations shall be toenailed to alternate supports; where supports are spaced more than 48 inches (1219 mm) on center, alternate laminations shall be toenailed to every support. For mechanically laminated decking constructed with laminations of 2-inch (51 mm) nominal thickness, toenailing in accordance with Table 2304.9.3.2 shall be permitted.
| MINIMUM NAIL SIZE (Length x Diameter) (inches) | MAXIMUM SPACING BETWEEN FACE NAILS a, b (inches) | NUMBER OF TOENAILS INTO SUPPORTSc | |
| Decking Supports ≤ 48 inches o.c. | Decking Supports > 48 inches o.c. | ||
| 4 × 0.192 | 30 | 18 | 1 |
| 4 × 0.162 | 24 | 14 | 2 |
| 4 × 0.148 | 22 | 13 | 2 |
| 31/2 × 0.162 | 20 | 12 | 2 |
| 31/2 × 0.148 | 19 | 11 | 2 |
| 31/2 × 0.135 | 17 | 10 | 2 |
| 3 × 0.148 | 11 | 7 | 2 |
| 3 × 0.128 | 9 | 5 | 2 |
| 23/4 × 0.148 | 10 | 6 | 2 |
| 23/4 × 0.131 | 9 | 6 | 3 |
| 23/4 × 0.120 | 8 | 5 | 3 |
For SI: 1 inch = 25.4 mm
- Nails shall be driven perpendicular to the lamination face, alternating between top and bottom edges.
- Where nails penetrate through two laminations and into the third, they shall be staggered one-third of the spacing in adjacent laminations. Otherwise, nails shall be staggered one-half of the spacing in adjacent laminations.
- Where supports are 48 inches on center or less, alternate laminations shall be toenailed to alternate supports; where supports are spaced more than 48 inches on center, alternate laminations shall be toenailed to every support.
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