When constructing a wood frame shear wall in California seismic zones, what is the minimum nominal thickness required for structural wood structural panel sheathing when using 8d common nails?
Correct Answer
B) 7/16 inch
CBC Table 2306.3.1 specifies that structural wood panels used for shear wall sheathing with 8d common nails must be minimum 7/16 inch nominal thickness. This California requirement ensures adequate nail penetration and withdrawal resistance for seismic loads typical in California construction.
Why This Is the Correct Answer
CBC Table 2306.3.1 specifies 7/16 inch as the minimum nominal panel thickness for wood structural panel shear walls when using 8d common nails. This thickness ensures that the nails achieve the required penetration into the panel without splitting and develop the full nail withdrawal and shear values needed for seismic load resistance.
Why the Other Options Are Wrong
Option A: 3/8 inch
3/8 inch panels are thinner than the 7/16 inch minimum required with 8d nails. The 8d nail's diameter and length relative to 3/8-inch material would compromise the nail's edge distance and pullout values, reducing the shear wall's capacity.
Option C: 15/32 inch
15/32 inch (approximately 1/2 inch) exceeds the minimum but is not the code minimum — it is a commonly available panel size used in many applications. Selecting it here would be conservative but would not represent the code-prescribed minimum.
Option D: 5/16 inch
5/16 inch is too thin for 8d nail shear wall applications. At this thickness, nail penetration ratios and edge distances would be insufficient to achieve the required shear values, and panel splitting would be a concern.
Memory Technique
Think '8d nails need 7/16 panels' — both numbers contain a 7: 8d and 7/16. The '7' connects the nail size to the panel thickness. Eight-d common nails pair with seven-sixteenths panels.
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