Strong-Drive® SDWF FLOOR-TO-FLOOR Screw 

The Strong-Drive SDWF Floor-to-Floor screw is designed to simplify the wind-uplift restraint connection while providing superior performance over the life of the structure. The unique design of the SDWF enables it to attach upper and lower walls together from the top, spanning the floor system and providing an easy-to-install connection within the continuous uplift load path of the structure.

The innovative Take-Up Washer (TUW) plays a key role in the long-term performance of the SDWF when installed between the screw head and the sole plate of the upper floor. As the structure settles because of shrinkage and construction loading, the threaded portion under the head of the screw ratchets up through the tabs of the TUW, which is fastened with Simpson Strong-Tie Strong-Drive SD screws. The interlock between the tabs of the take-up washer and the threads under the head of the SDWF prevent the screw from sliding back under load, providing a simple yet reliable means of shrinkage compensation up to 3/4" per story.

Key Features

• Faster to install than other floor-to-floor connection methods — drive the screw, install the take-up washer and the connection is made from plate-to-plate
• Shrinkage compensation ensures a tight connection even after initial shrinkage and settlement occur
• Installs from inside the structure, eliminating exterior work on upper stories and enhancing job safety
• Fastening can be done before or after exterior sheathing is applied for added flexibility
• One screw length can be used for multiple floor depths (refer to chart to select appropriate screw size), reducing the need for many screw lengths

Applications

• Wind-uplift restraint connections

Product Includes

Kit includes all required installation hardware:

• (25) Strong-Drive SDWF Floor-to-Floor screws
• (25) TUW take-up washers (washer is galvanized 10 ga. steel)
• (100) Strong-Drive SD Connector screws (#9)
• 5/16" hex driver bit (replacement driver bit — BITHEXR516-134)
• Screw depth guide to ensure proper SDWF engagement with TUW

Codes

• ICC-ES ESR-3046 (SDWF)
• ICC-ES ESR-2320 (TUW)
• State of Florida FL9589
• State of Florida FL10007 (TUW)
• City of Los Angeles RR25907
• U.S. Patent 8,276,323

Related Links

• Fastening Systems Technical and Installation Notes

Catalog Pages

• Product Information: C-F-2017 (Fastening Systems), page 95
• Technical Data and Loads: C-F-2017 (Fastening Systems), pages 352–355

Related Literature

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C-F-2017

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  Strong-Drive SDWF Floor-To-Floor Screw

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  The Strong-Drive® SDWF Floor-to-Floor screw is designed to simplify the floor-to-floor, wind-uplift restraint connection and provide superior performance over the life of the structure.

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Product Information Table

Load Tables

Product Information and Withdrawal Loads

1. Allowable loads are for C_D=1.0 and may be increased for load duration up to C_D = 1.6.
2. Joist depth listed based on the 3/4" subfloor and 3" of thread penetration into double top plates.

SDWF-TUW Floor-to-Floor Screw — On Center Spacing for Uniform Uplift Loads

1. Spacing listed based on lesser of: single bottom plate bending allowable load, single bottom plate deflection limited to spacing/240 and 1/4" max, screw allowable withdrawal load, and take-up washer allowable load.
2. Withdrawal load is based on a C_D = 1.6 and minimum 3" penetration into lower wall double top plates.
3. Stud-to-plate connections are required to complete the load path. These connections shall not exceed the lesser of 48" o.c. or SDWF spacing.
4. Spacing values listed for SP lumber consider new base values adopted by AWC on June 1, 2012.

Concentrated Uplift Loads

1. Allowable loads listed include a wood load duration factor of C_D = 1.6 for wind or earthquake loading with no further increase allowed; reduce when other loads govern.
2. Single and double SDWF-TUW applications listed are for concentrated load uplift restraint conditions (i.e. end of header, at girders, or at the end of shearwalls).

See additional Load Tables, Technical Data and Installation Instructions for the Strong-Drive^® SDWF Floor-to-Floor screw