PROLDH Underlayment/Backerboard Attachment
Floor Framing: Ensures a secure connection between floor joists and headers
Includes (1) T30 drive bit and (1) standard ANSI drill bit
Flat Head with Nibs: Seats flush and finishes cleanly
Face-Mount Installation: Provides strong support by attaching directly to headers
#10 x 1" Simpson Strong-Tie T25 DWP Flat Head Wood Screw - 305 Stainless Steel, Pkg. 4,500 Stainless Steel Large Diameter Concrete Screws PROLDH Underlayment/Backerboard AttachmentSimpson Strong Tie DWP Flat Head Screws are built for strength, reliability, and clean finishes in decking, trim, and general exterior wood applications. Made from 305 stainless steel for maximum dependable outdoor corrosion resistance, these screws perform in harsh environments and with treated lumber. The flat head design allows the screw to countersink for a flush fit, providing a smooth, professional look. With a Type 17 point, installation is