Description
The Strong-Drive SDW Truss-Ply screw is a high-strength structural wood screw specifically designed for fastening multi-ply wood members, such as joining plated trusses and solid-sawn lumber. The SDW installs easily with no predrilling and is available in optimized lengths for fastening 2-, 3- and 4-ply trusses. With the SDW Truss-Ply screw, multi-ply trusses and components can be fastened from one side without requiring the lifting and flipping of heavy assemblies. It is code listed under IAPMO-UES ER-192 and meets 2015 and 2018 IRC® and IBC® code requirements for several common wood framing applications with wood and engineered wood.
Key Features
- Large washer head provides maximum bearing area; stamped with the Simpson Strong-Tie “≠” sign and fastener length for easy identification after installation (0.75" head dia.)
- 6-lobe, T40 drive provides positive engagement that makes the screw easy to drive and improves bit life (replacement driver bit — BIT40T-14)
- Low-profile head results in less interference after installation; makes stacking and sliding members easier and allows installation of hardware and finishes to be virtually flush
- Higher shear values than competitive products enable wider spacing, saving time and money
- Bold thread design provides superior holding power and cinches fastened members together for consistent installation
- SawTooth™ point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
- Retail and mini-bulk packs include one 6-lobe, T40 driver bit; bulk packs include two driver bits
- U.S. Patent 9,523,383
Applications
- Truss-ply fastening
Load Tables
SDW TRUSS-PLY — Allowable Shear Loads — DFL, SP, SPF, HF Lumberand 2x Truss Loaded on Head Side
- For minimum penetration into main (outermost) member of 1 1/8", use 235 lb. for DFL/SP and 210 lb. for SPF/HF.
SDW TRUSS-PLY — Allowable Shear Loads — DFL, SP, SPF, HF Lumber and 2x Truss Loaded on Point Side
- For minimum penetration into main member of 1 1/8", use 235 lb. for DFL/SP and 210 lb. for SPF/HF.
SDW TRUSS-PLY — Allowable Uniform Load (plf) Applied to Either Outside Member — Side-Loaded Multi-Ply Assemblies
- Each ply is assumed to carry same proportion of load.
- Loads may be applied to the head side and point side concurrently provided neither published allowable load is exceeded. (Example: a three-ply DFL assembly with a head side load of 1,300 plf and point side load of 900 plf may be fastened together with 3 rows of SDW at 16" o.c. between fasteners in a row.)
- When hangers are installed on point side, hanger face fasteners shall be a minimum of 3" long.
- Tables are based on Main Member Penetration as noted in tables above.
- Hanger load spacing on the multi-ply assembly should not exceed 24" o.c. Exception: On a skewed girder, hanger loads up to 34" o.c. (resulting from joists uniformly spaced up to 24" o.c.) may be converted to a uniform load.
See additional Load Tables, Technical Data and Installation Instructions for the Strong-Drive® SDW Truss-Ply screw.
