The Simpson Strong-Tie^® Strong-Drive^® SDWF Floor-to-Floor screw is designed to simplify the floor-to-floor, 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.

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The innovative TUW take-up washer 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 Connector 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 for up to 19mm per story.

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SDWF — Carbon steel
TUW — 3.5mm Carbon steel

SDWF — E-Coat^™
TUW — Galvanised

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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 the 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
The SDWF kit includes all required installation hardware

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\r\n\t\t\t\t\t Model No. \r\n\t\t\t\t	\r\n\t\t\t\t\t Size \r\n\r\n\t\t\t\t\t (mm) \r\n\t\t\t\t	\r\n\t\t\t\t\t Thread Length (mm) \r\n\t\t\t\t	\r\n\t\t\t\t\t Head Dia. mm/Head Type \r\n\t\t\t\t	\r\n\t\t\t\t\t Joist Depth Below(mm) \r\n\t\t\t\t	\r\n\t\t\t\t\t Allowable Withdrawal per Thread \r\n\r\n\t\t\t\t\t Penetration (N/mm) \r\n\t\t\t\t
\r\n\t\t\t\t\t Single 45mm Bottom Plate \r\n\t\t\t\t
\r\n\t\t\t\t\t Min. \r\n\t\t\t\t	\r\n\t\t\t\t\t Max. \r\n\t\t\t\t	\r\n\t\t\t\t\t JD4 \r\n\t\t\t\t	\r\n\t\t\t\t\t JD5 \r\n\t\t\t\t	\r\n\t\t\t\t\t JD6 \r\n\t\t\t\t
\r\n\t\t\t\t\t SDWF2720-TUW \r\n\t\t\t\t	\r\n\t\t\t\t\t 7mm x 508mm \r\n\t\t\t\t	\r\n\t\t\t\t\t 127 \r\n\t\t\t\t	\r\n\t\t\t\t\t 18.5mm/ Hex \r\n\t\t\t\t	\r\n\t\t\t\t\t 320mm \r\n\t\t\t\t	\r\n\t\t\t\t\t 360mm \r\n\t\t\t\t	\r\n\t\t\t\t\t 131 \r\n\t\t\t\t	\r\n\t\t\t\t\t 105 \r\n\t\t\t\t	\r\n\t\t\t\t\t 80 \r\n\t\t\t\t
\r\n\t\t\t\t\t \r\n\t\t\t\t\t\t Joist depth listed based on the 19mm flooring and 70mm of thread penetration into double top plates. \r\n\t\t\t\t\t\t For 300mm deep joists install a 35mm block on bottom plate. \r\n\t\t\t\t\t \r\n\t\t\t\t

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SDWF Floor-to-Floor Screw