Straps & Ties
STRONG-DRIVE® SDWF FLOOR-TO-FLOOR Screw 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 Strong-Drive SDWF Floor-to-Floor screw 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 Strong-Drive SDWF Floor-to-Floor screw 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, which is fastened with Strong-Drive SD Connector screws. The interlock between the tabs of the take-up washer and the threads under the head of the Strong-Drive SDWF Floor-to-Floor screw prevent the screw from sliding back under load, providing a simple yet reliable means of shrinkage compensation up to ¾" per story. MATERIAL: SDWF – carbon steel, TUW – 10 gauge FINISH: SDWF—E-Coat™; TUW—Galvanized INSTALLATION: • Use all specified fasteners. See General Notes. • Refer to flier F-SDWFTUW, or the Simpson Strong-Tie Fastening Systems catalog or visit www.strongtie.com. KIT CONTAINS: 25–Strong-Drive SDWF Floor-to-Floor screws, 25–TUW take-up washers, 100 – #9x2 1⁄2 Strong-Drive SD Connector screws, 5⁄16" hex driver bit and screw depth guide. CODES: See page 12 for Code Reference Key Chart.
31⁄2"
31⁄4"
TUW
U.S. Patent 8,276,323
16"-26"
Product Information and Withdrawal Loads Allowable Joist Depth Below (in.)
Model No
Size (in.)
Thread Length (in.)
Min.
Max.
Min.
Max.
SDWF2716-TUW
0.27 x 16
5
8 1⁄2
10 1⁄2
6 7⁄8
9
SDWF2720-TUW
0.27 x 20
5
12 1⁄2
14 1⁄2
10 7⁄8
13
SDWF2724-TUW
0.27 x 24
5
16 1⁄2
18 1⁄2
14 7⁄8
17
SDWF2726-TUW
0.27 x 26
5
18 ⁄2
20 ⁄2
16 ⁄8
19
Single Bottom Plate
1
1
Double Bottom Plate
7
Allowable Withdrawal per Thread Penetration (lbs./in.) (100) SP
DF
SPF
295
250
180
Code Ref.
I24, I26, F31, L24
5"
® SDWF ng-Drive One Stro -FLOOR screw O FLOOR-T stalled between in must be 12" on each d 4" an r-wall, ny uppe side of a -plate splice m o bott Upper wall bottom-plate splice shown
Strong-Drive® SDWF U.S. Patent 8,276,323
Straps & Ties
C-C-2015 © 2015 SIMPSON STRONG-TIE COMPANY INC. PRINTED 12/14
1. Allowable loads may be increased for load duration up to CD = 1.6. 2. Joist depth listed based on the 3⁄4" subfloor and 3" of thread penetration into double top plates.
Joist Depth
1" Min. Rim Joist in. 4" M Ende c tan Dis
Lower wall top plate splice shown
Typical Strong-Drive® SDWF FLOOR-TO-FLOOR and TUW Installation
2° Max. Typical Strong-Drive SDWF FLOOR-TO-FLOOR Angle Limit Installation ®
191