Simpson Strong-Tie Strong-Drive WSV Subfloor screws were re-engineered from head to point to reduce driving torque, speed installation, and help eradicate the squeaking caused by poorly fastened subfloor sheathing. They feature a ribbed head design to countersink easily and a variable thread to ease driving torque and speed fastening when used with the Quik Drive auto-feed screw driving system. The screws are available in 1 3/4-, 2-, 2 1/2-, and 3-inch lengths and have a yellow zinc coating for interior applications. We found a box of 2,000 #9 1 3/4-inch WSV screws online for about $80. strongtie.com
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