// CODE SNIPPET
2306.2.1 Wall Stud Bending Stress Increase
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For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per foot = 14.5939 N/m.
The NDS fiber stress in bending (Fb) design values for wood studs resisting wind shall be increased by the factors in Table 2306.2.1, in lieu of the 1.15 repetitive member factor, to take into consideration the load sharing and composite actions provided by the wood structural panels as defined in Section 2302.1, where the studs are designed for bending in accordance with Section 1609.6 spaced no more than 16 inches (406 mm) o.c, covered on the inside with a minimum of 1/2-inch (12.7 mm) gypsum board fastened in accordance with Table 2306.4.5, and sheathed on the exterior with a minimum of 3/8-inch (9.5 mm) wood structural panel sheathing that is attached to the studs using a minimum of 8d common nails spaced a maximum of 6 inches o.c. (152 mm) at panel edges and 12 inches o.c. (305 mm) in the field of the panels.
| STUD SIZE | SYSTEM FACTOR |
|---|---|
| 2 x 4 2 x 6 2 x 8 2 x 10 2 x 12 |
1.5 1.4 1.3 1.2 1.15 |
| TYPE OF MATERIAL | THICKNESS OF MATERIAL |
WALL CONSTRUCTION |
FASTENER SPACINGb MAXIMUM (inches) |
SHEAR VALUEa,e (plf) |
MINIMUM FASTENER SIZEc,d,j,k |
|---|---|---|---|---|---|
| 1. Expanded metal or woven wire lath and portland cement plaster | 7/8" | Unblocked | 6 | 180 | No. 11 gage 11/2" long, 7/16" head 16 Ga. Galv. Staple, 7/8" legs |
| 2. Gypsum lath, plain or perforated | 3/8" lath and 1/2" plaster | Unblocked | 5 | 100 | No. 13 gage, 11/8" long, 19/64" head, plasterboard nail 16 Ga. Galv. Staple, 11/8" long 0.120" Nail, min. 3/8" head, 11/4" long |
| 3. Gypsum sheathing | 1/2" x 2' x 8' | Unblocked | 4 | 75 | No. 11 gage, 13/4" long, 7/16" head, diamond-point, galvanized 16 Ga. Galv. Staple, 13/4" long |
| 1/2" × 4 | Blockedf Unblocked |
4 7 |
175 100 |
||
| 5/8" x 4' | Blocked | 4" edge/ 7" field |
200 | 6d galvanized 0.120" Nail, min. 3/8" head, 13/4" long | |
| 1/2" | Unblockedf | 7 | 75 | 5d cooler or wall board 0.120" Nail, min. 3/8" head, 11/2" long 16 Gage Staple, 11/2" long | |
| Unblockedf | 4 | 110 | |||
| Unblocked | 7 | 100 | |||
| Unblockedf | 4 | 125 | |||
| Blockedg | 7 | 125 | |||
| Blockedg | 4 | 150 | |||
| Unblocked | 8/12h | 60 | No. 6-11/4" screwsi | ||
| Blockedg | 4/16h | 160 | |||
| Blockedf,g | 4/12h | ||||
| Blockedg | 8/12h | ||||
| Blockedg | 6/12h | ||||
5/8" |
Unblockedf | 7 | 115 | 6d cooler or wall board 0.120" Nail, min. 3/8" head, 13/4" long 16 Gage Staple, 11/2" legs, 15/8" long | |
| 4 | 145 | ||||
Blockedg |
7 | 145 | |||
| 4 | 175 | ||||
| Blockedg Two-ply |
Base ply: 9 Face ply: 7 |
250 | Base ply—6d cooler or wall board 1 3/4" × 0.120" Nail, min. 3/8" head 1 5/8" 16 Ga. Galv. Staple Face ply—8d cooler or wall board 0.120" Nail, min. 3/8" head, 2 3/8" long 15 Ga. Galv. Staple, 21/4" long | ||
| Unblocked | 8/12h | 70 | No. 6-11/4" screwsi |
||
| Blockedg | 8/12h | 90 |
- These shear walls shall not be used to resist loads imposed by masonry or concrete construction (see Section 2305.1.5). Values shown are for short-term loading due to wind or seismic load. Walls resisting seismic loads shall be subject to the limitations in Section 1617.6. Values shown shall be reduced 25 percent for normal loading.
- Applies to nailing at studs, top and bottom plates and blocking.
- Alternate nails are permitted to be used if their dimensions are not less than the specified dimensions. Drywall screws are permitted to be substituted for the 5d and 6d (cooler) nails listed above. 11/4inch Type S or W, No. 6 for 6d (cooler) nails.
- For properties of cooler nails, see ASTM C 514.
- Except as noted, shear values are based on a maximum framing spacing of 16 inches on center.
- Maximum framing spacing of 24 inches on center.
- All edges are blocked, and edge nailing is provided at all supports and all panel edges.
- First number denotes fastener spacing at the edges; second number denotes fastener spacing in the field.
- Screws are Type W or S.
- Staples shall have a minimum crown width of 7/16 inch, measured outside the legs.
- Staples for the attachment of gypsum lath and woven-wire lath shall have a minimum crown width of 3/4 inch, measured outside the legs.
Related Code Sections
2306.2.1 Wood, Wall Stud Bending Stress Increase
inches o.c. (152 mm) at panel edges and 12 inches o.c. (305 mm) in the field of the panels.
TABLE 2306.2.1
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