Horizontal floor diaphragm nailing shall be Simpson Strong-Tie Quik Drive WSNTL Series #8 flat head, countersunk wood screws (ICC ER-5053) with a minimum 1 1/4" penetration into the wood framing member. Quik Drive fasteners are specifically required to meet the structural calculations of plan.

Before substituting another brand, confirm that the load capacity is based on reliable published testing data or calculations. The Designer/Engineer of Record should evaluate and give written approval for substitution prior to installation.

top Allowable Shear for Horizontal Diaphragm Using WSNTL2LS or WSNTL212S

1. Allowable loads are listed in pounds per foot with DF-L or SP framing.
2. For IBC wind design, shear capacities may be increased 40% per IBC 2306.3.1. For normal loading, shear capacities shall be reduced 25%. These two adjustments are not included in the Code Report.
3. Space screws at 12" on center along intermediate framing members.
4. Framing at adjoining panel edges must be 3 inches nominal or wider, and screws must be staggered where screws are spaced 2" or 2 1/2" on center.
5. WSNTL212S screws required.
6. The values for this application are not included in the Code Report.
7. See 2003 IBC chapter 23 and 1997 UBC chapter 23 for additional requirements and information.
8. See 1997 UBC Table 23-II-H for Panel Grades.
9. Refer to the horizontal diaphragm figures of IBC Table 2306.3.1 or ICC ER-5053.