CSLB General Building (B)Framing and CarpentryHard
A residential building in a high seismic zone requires shear walls for lateral load resistance. The plans specify 7/16-inch OSB sheathing with 8d common nails. The building inspector observes that the framers are nailing the sheathing at 6 inches on center along the panel edges and 12 inches on center in the field. What is the minimum edge distance required for these 8d common nails from the edge of the OSB panel?
- A3/8 inch
- B1/4 inch
- C1/2 inch
- D5/8 inch
Show answer & explanationAnswer & explanation
Correct answer: A. 3/8 inch
For wood structural panels (like OSB) used in shear walls, the minimum edge distance for nails, especially 8d common nails, is typically 3/8 inch from the panel edge. This distance helps prevent the wood from splitting and ensures the nail can effectively transfer shear forces.
Why the other options are wrong
- B. 1/4 inch is generally too close to the edge and risks splitting the panel or reducing nail capacity.
- C. While 1/2 inch is acceptable, it's not the minimum required and could lead to slight material waste if consistently used when 3/8 inch is sufficient.
- D. 5/8 inch is an excessive edge distance and not a typical code minimum for this application.
Shear Wall Nailing Edge Distance
The minimum distance required between the center of a nail and the edge of a wood structural panel (e.g., OSB, plywood) in a shear wall, critical for preventing panel edge splitting and ensuring full shear capacity.
- Typically 3/8 inch for wood structural panels.
- Ensures adequate wood fiber around the nail.
- Prevents splitting and premature failure under shear forces.
Memory trick: Nail it right, for a wall that's tight.