Page 18 of Wood Construction Connectors 2006 Catalog by Simpson Strong-Tie

19 Auto-Feed Screw Driving Systems QUIK DRIVE FASTENERS AND ATTACHMENTS Panel Grade Minimum Nominal Width of Framing Member Panel Thickness 6 4 2 3 2 3 6 6 Screw Spacing at Other Panel Edges 2 Code Ref. 4 3 Case 1 (No unblocked edges or continuous joints parallel to load) All other configurations (Cases 2, 3, 4, 5 and 6) BLOCKED DIAPHRAGMS 2 Screw spacing at diaphragm boundaries (all cases), at continuous panel edges parallel to load (Cases 3 and 4), and at all panel edges (Cases 5 and 6) UNBLOCKED DIAPHRAGMS Screws spaced 6 inches, maximum, at supported edges 2 Structural I Sheathing, single floor and other grades covered in DOC PS1 and PS2 7 2 3 2 3 2 3 320 360 290 325 320 360 425 480 385 430 425 480 640 720 575 650 640 720 730 820 655 735 730 820 285 320 255 290 285 320 215 240 190 215 49 215 240 1 4,5 2 3 320 360 425 480 640 720 730 820 285 320 215 240 1. 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. 2. Space screws at 12" on center along intermediate framing members. 3. Framing at adjoining panel edges must be 3 inches nominal or wider, and screws must be staggered where screws are spaced 2" or 2 on center. 4. WSNTL212S screws required. 5. The values for this application are not included in the Code Report. 6. See 2003 IBC chapter 23 and 1997 UBC chapter 23 for additional requirements and information. 7. See 1997 UBC Table 23-II-H for Panel Grades. Allowable Shear in Pounds per Foot for Horizontal Plywood Diaphragms with WSNTL2LS or WSNTL212S Screws and Douglas Fir-Larch or Southern Pine 1,6 Framing For more information visit www.strongtie.com REDUCE SQUEAKS One of the most common causes of floor squeaks is nail withdrawal from the floor framing members, which often dry 6 to 12% in service. Nail withdrawal allows the sheathing to move locally, rubbing against the nail resulting in squeaks. Quik Drive auto-feed screw delivery systems offer withdrawal resistance which can help reduce squeaks. These systems install screws almost as quickly as pneumatic nailers and provide equivalent shear transfer. With these advantages, engineers can design using screws resulting in long term serviceability advantages over nails, particularly in floor diaphragms. Designing with Steel? If you are designing a structure using Cold-Formed Steel, comprehensive design information on using Quik Drive screws in your project can be found in the latest issue of Simpson Strong-Ties Cold-Formed Steel catalog (C-CFS06). You can access this information via the web at www.strongtie.com.

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