Slide 29 of 67
- What is required?
- The 1994 Uniform Building Code allows:
- 3-inch nominal width (2½ net) framing at adjoining panel edges when 6d, 8d and 10d short nails are spaced 2 inches on center
- or 10d long nails are spaced 3 inches or less on center.
- Tests have shown:
- that framing members split at ultimate loads when sheathing nails are closely spaced.
- that shear walls are 17% stronger when 3 inch framing is used throughout.
- Remember: The thicker the framing, the stronger the shear wall
- Edge distance for nails
- Minimum edge distance for common nails is:
5/8 for 6d,
3/4 for 8d and
7/8 for 10d.
- This edge distance should be provided in all framing members and blocking.
- If an engineer were to use this UBC criteria to design the connection of two adjoining pieces of sheathing to a framing member, nail edge distance requirements in the framing member and sheathing would always require a minimum 3 inch nominal width framing member.
- Although thicker framing members are not always required by the minimum standards of the building code, using 3 inch nominal width framing at ALL adjoining panel edges will generally increase shear wall strength.