Multi-Ply Wood Trusses Applications: Strong-Drive® Screws (SDS) For Two-Ply 4X2 Parallel Chord Trusses
Thank you for choosing Simpson Strong-Tie for your uplift connectors!
Steps to Choose an Uplift Connector
- Determine roof uplift capacity required.
- Determine species of wood being connected.
- Enter table below and choose connector.
- Determine if lateral loads are required in addition to uplift loads. If so, lateral loads are listed here. See below for reducing capacity for loading in multiple directions.
- Install connectors using number and size of fasteners shown in this table.
- For more options for selection of connectors, see here.
- Install additional connectors to provide a continuous load path to the foundation. See here for more information on the continuous load path.
| Selecting Connectors For Roof-to-Wall Connection
|Both members Southern Pine or Douglas Fir-Larch lumber
||480 or less
| 481 - 745
| 746 - 1000
| 1001 -1340
| 1341 -1450
| One or both members Spruce-Pine-Fir or Hem-Fir Lumber
|| 480 or less
| 481 - 565
| 566 - 860
| 861 - 1015
| 1016 - 1245
For other multi-ply applications, see SDS for Girder Trusses and SDW Strong-Drive Structural Wood Screws.
Installation Method 1
- Top Chord Other web configurations may be used -
Installation Method 2
- Vertical Web Other web configurations may be used -
Screw position in the truss
- Allowable loads are based on a CD = 1.00. Increases are allowed for other durations per code to a maximum CD = 1.60.
- Method 1 - To be considered effective all Strong-Drive screws shall be installed within 12" of the applied concentrated load.
- Method 1 and Method 2 screws can be combined as required to transfer half of the applied load to the supporting truss.
- For uniform top chord loads, space Strong-Drive screws as required to transfer half of the applied load to the supporting truss.
- Web configurations other than those shown above may be used as allowed by the Truss Designer.