Multi-Ply Wood Trusses Applications:
Strong-Drive® Screws (SDS)
For Girder Trusses
Simpson Strong-Tie® Strong-Drive® screws (SDS) offer a fast and easy method for fastening multi-ply trusses from one side, with no need to flip the truss. Also see SDW Strong-Drive® Structural Wood Screws with low-profile heads for another easy-to-use, cost-effective solution for joining plated trusses.
- Install Strong-Drive® screws a minimum of 1 inch into the last truss ply, with a maximum gap of 1/8" allowed between each truss ply.
- Screw spacing shall not exceed 24" o.c.
- Hanger load spacing on the multiple-ply truss shall not exceed 24" o.c.
- The Truss Designer shall ensure that adequate lateral bracing is provided to prevent displacement of the truss and the truss bottom chord due to the torsion created by the structural members framing into the side of the multiple-ply girder truss.
- Strong-Drive screws may be installed with the heads in either
the loaded or unloaded ply (see Allowable Shear Loads table). For unloaded ply applications, hanger face nails shall be a
minimum of 3" long.
- Strong-Drive screws are permitted to be installed through metal truss plates as approved by the Truss Designer, provided the requirements of ANSI/TPI 1-2007 Section 22.214.171.124 and 8.9.2 are met (pre-drilling required through the plate using a maximum of 5/32" bit).
- Use 1 row of SDS's in 2x4 members, 2 rows in 2x6 and 2x8 members, 3 rows in 2x10 members. Rows should be staggered.
- Individual screw locations may be adjusted up to 1/2 of the required screw spacing to avoid conflicts with other hardware or to avoid lumber defects.