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Simpson Strong-Tie has redesigned its popular subfloor screw to reduce driving force and increase installation speed. The new Strong-Drive WSV Subfloor screw has been developed for fastening subfloor sheathing using the auto-feed Quik Drive screw system. The Strong-Drive WSV Subfloor screw is the only fastener to be dual-evaluated to ICC-ES AC233 and AC120 for fastening wood-framed subfloors. These tests indicate that WSV Subfloor screws have higher lateral, shear, and shrinkage values ​​than common 10d nails, and that diaphragms constructed with WSV Subfloor screws meet or exceed the strength and stiffness of wood-framed diaphragms constructed with 10d nails. Also, the Strong-Drive WSVF Subfloor screw for fire-resistant wood-based materials. The Strong-Drive WSVF Subfloor screw is a variant available with a gray Quik Guard coating whose corrosion resistance is recognized in IAPMO UES ER-192 for exposures 1 and 3, as described in ICC-ES AC257. Like the WSV Subfloor screw, the WSVF Subfloor screws are designed for dry applications. The WSVF screw coating system provides corrosion resistance for use with wood and wood-based materials in dry service where the wood and wood-based materials have treatment retentions typical of AWPA Use Categories 1 through 4A and wood and wood-based materials treated with a fire retardant that is recognized in an evaluation report where the corrosion effects of the fire retardant chemical are referenced to code-prescribed protection systems for carbon steel fasteners.

• The redesigned point and thread provide easier starts and reduce driving torque by up to 25% (test data shows the Strong-Drive WSV Subfloor screw requires up to 25% less driving torque in single-material LVL) - speeds driving by up to 20% (test data shows the redesigned WSV thread Speeds up driving by 20%)
• Lower installation torque also means less tool wear
• The deep, ribbed, 6-lobe head allows for clean countersinking and better bit retention, reducing stripping
• The holding power of WSV screws reduces gaps between the joist and subfloor that cause squeaky floors.