New Simpson Strong-Tie® SDWF Structural Wood Screw Designed to Simplify Floor-To-Floor Connections
The unique design of the SDWF fastener 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 TUW take-up washer plays a key role in the long-term performance of the SDWF when installed between the screw 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. 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.
The code-listed SDWF comes in various lengths with all required installation hardware.